[v4,1/3] GCC plugin infrastructure

Message ID	20160301181514.dc3dadeb7e18b77a09dddb7f@gmail.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-kbuild-owner@kernel.org> Date: Tue, 1 Mar 2016 18:15:14 +0100 From: Emese Revfy <re.emese@gmail.com> To: linux-kbuild@vger.kernel.org Cc: pageexec@freemail.hu, spender@grsecurity.net, kernel-hardening@lists.openwall.com, mmarek@suse.com, keescook@chromium.org, linux@rasmusvillemoes.dk, fengguang.wu@intel.com Subject: [PATCH v4 1/3] GCC plugin infrastructure Message-Id: <20160301181514.dc3dadeb7e18b77a09dddb7f@gmail.com> In-Reply-To: <20160301181400.9c623ee9230381da90b89b2a@gmail.com> References: <20160301181400.9c623ee9230381da90b89b2a@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk

Emese Revfy March 1, 2016, 5:15 p.m. UTC

This patch allows to build the whole kernel with GCC plugins. It was ported from
grsecurity/PaX. The infrastructure supports building out-of-tree modules and
building in a separate directory. Cross-compilation is supported too but
currently only the x86 architecture enables plugins.

The directory of the gcc plugins is tools/gcc. You can use a file or a directory
there. The plugins compile with these options:
 * -fno-rtti: gcc is compiled with this option so the plugins must use it too
 * -fno-exceptions: this is inherited from gcc too
 * -fasynchronous-unwind-tables: this is inherited from gcc too
 * -ggdb: it is useful for debugging a plugin (better backtrace on internal
    errors)
 * -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
 * -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
    variable, plugin-version.h)

The infrastructure introduces a new Makefile target called gcc-plugins. It
supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
This script also checks the availability of the included headers in
tools/gcc/gcc-common.h.

The gcc-common.h header contains frequently included headers for GCC plugins
and it has a compatibility layer for the supported gcc versions.

The gcc-generate-*-pass.h headers automatically generate the registration
structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.

Note that 'make clean' keeps the *.so files (only the distclean or mrproper
targets clean all) because they are needed for out-of-tree modules.

Signed-off-by: Emese Revfy <re.emese@gmail.com>
---
 Documentation/dontdiff                   |   1 +
 MAINTAINERS                              |   8 +
 Makefile                                 |  41 +-
 arch/Kconfig                             |  13 +
 arch/x86/Kconfig                         |   1 +
 init/Makefile                            |   3 +
 scripts/Makefile.build                   |   2 +-
 scripts/Makefile.clean                   |   3 +-
 scripts/Makefile.gcc-plugins             |  28 ++
 scripts/Makefile.host                    |  69 ++-
 scripts/gcc-plugin.sh                    |  51 ++
 scripts/link-vmlinux.sh                  |   2 +-
 scripts/package/builddeb                 |   1 +
 tools/gcc/Makefile                       |  15 +
 tools/gcc/gcc-common.h                   | 803 +++++++++++++++++++++++++++++++
 tools/gcc/gcc-generate-gimple-pass.h     | 173 +++++++
 tools/gcc/gcc-generate-ipa-pass.h        | 287 +++++++++++
 tools/gcc/gcc-generate-rtl-pass.h        | 173 +++++++
 tools/gcc/gcc-generate-simple_ipa-pass.h | 173 +++++++
 19 files changed, 1832 insertions(+), 15 deletions(-)
 create mode 100644 scripts/Makefile.gcc-plugins
 create mode 100644 scripts/gcc-plugin.sh
 create mode 100644 tools/gcc/Makefile
 create mode 100644 tools/gcc/gcc-common.h
 create mode 100644 tools/gcc/gcc-generate-gimple-pass.h
 create mode 100644 tools/gcc/gcc-generate-ipa-pass.h
 create mode 100644 tools/gcc/gcc-generate-rtl-pass.h
 create mode 100644 tools/gcc/gcc-generate-simple_ipa-pass.h

Kees Cook March 1, 2016, 7:07 p.m. UTC | #1

On Tue, Mar 1, 2016 at 9:15 AM, Emese Revfy <re.emese@gmail.com> wrote:
> This patch allows to build the whole kernel with GCC plugins. It was ported from
> grsecurity/PaX. The infrastructure supports building out-of-tree modules and
> building in a separate directory. Cross-compilation is supported too but
> currently only the x86 architecture enables plugins.
>
> The directory of the gcc plugins is tools/gcc. You can use a file or a directory
> there. The plugins compile with these options:
>  * -fno-rtti: gcc is compiled with this option so the plugins must use it too
>  * -fno-exceptions: this is inherited from gcc too
>  * -fasynchronous-unwind-tables: this is inherited from gcc too
>  * -ggdb: it is useful for debugging a plugin (better backtrace on internal
>     errors)
>  * -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
>  * -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
>     variable, plugin-version.h)
>
> The infrastructure introduces a new Makefile target called gcc-plugins. It
> supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
> chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
> This script also checks the availability of the included headers in
> tools/gcc/gcc-common.h.
>
> The gcc-common.h header contains frequently included headers for GCC plugins
> and it has a compatibility layer for the supported gcc versions.
>
> The gcc-generate-*-pass.h headers automatically generate the registration
> structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.
>
> Note that 'make clean' keeps the *.so files (only the distclean or mrproper
> targets clean all) because they are needed for out-of-tree modules.
>
> Signed-off-by: Emese Revfy <re.emese@gmail.com>

Reviewed-by: Kees Cook <keescook@chromium.org>

I wonder if it might make sense to split the .so-building logic
changes from the gcc plugin changes to make things more readable for
review? Personally, I'm fine with this as-is, but it might benefit
other reviewers, if it's a sane split.

> ---
>  Documentation/dontdiff                   |   1 +
>  MAINTAINERS                              |   8 +
>  Makefile                                 |  41 +-
>  arch/Kconfig                             |  13 +
>  arch/x86/Kconfig                         |   1 +
>  init/Makefile                            |   3 +
>  scripts/Makefile.build                   |   2 +-
>  scripts/Makefile.clean                   |   3 +-
>  scripts/Makefile.gcc-plugins             |  28 ++
>  scripts/Makefile.host                    |  69 ++-
>  scripts/gcc-plugin.sh                    |  51 ++
>  scripts/link-vmlinux.sh                  |   2 +-
>  scripts/package/builddeb                 |   1 +
>  tools/gcc/Makefile                       |  15 +
>  tools/gcc/gcc-common.h                   | 803 +++++++++++++++++++++++++++++++
>  tools/gcc/gcc-generate-gimple-pass.h     | 173 +++++++
>  tools/gcc/gcc-generate-ipa-pass.h        | 287 +++++++++++
>  tools/gcc/gcc-generate-rtl-pass.h        | 173 +++++++
>  tools/gcc/gcc-generate-simple_ipa-pass.h | 173 +++++++
>  19 files changed, 1832 insertions(+), 15 deletions(-)
>  create mode 100644 scripts/Makefile.gcc-plugins
>  create mode 100644 scripts/gcc-plugin.sh
>  create mode 100644 tools/gcc/Makefile
>  create mode 100644 tools/gcc/gcc-common.h
>  create mode 100644 tools/gcc/gcc-generate-gimple-pass.h
>  create mode 100644 tools/gcc/gcc-generate-ipa-pass.h
>  create mode 100644 tools/gcc/gcc-generate-rtl-pass.h
>  create mode 100644 tools/gcc/gcc-generate-simple_ipa-pass.h
>
> diff --git a/Documentation/dontdiff b/Documentation/dontdiff
> index 8ea834f..5385cba 100644
> --- a/Documentation/dontdiff
> +++ b/Documentation/dontdiff
> @@ -3,6 +3,7 @@
>  *.bc
>  *.bin
>  *.bz2
> +*.c.[012]*.*
>  *.cis
>  *.cpio
>  *.csp
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8b0e00e..409ef04 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4742,6 +4742,14 @@ L:       linux-scsi@vger.kernel.org
>  S:     Odd Fixes (e.g., new signatures)
>  F:     drivers/scsi/fdomain.*
>
> +GCC PLUGINS
> +M:     Kees Cook <keescook@chromium.org>
> +R:     Emese Revfy <re.emese@gmail.com>
> +L:     kernel-hardening@lists.openwall.com
> +S:     Maintained
> +F:     tools/gcc

I think that needs a trailing slash to indicate it's a tree to match.

> +F:     Documentation/gcc-plugins.txt

I wonder if this should be moved to Documentation/kbuild/ ?

> +
>  GCOV BASED KERNEL PROFILING
>  M:     Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
>  S:     Maintained
> diff --git a/Makefile b/Makefile
> index f3f70dc..2b65991 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -435,8 +435,8 @@ export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
>  # Rules shared between *config targets and build targets
>
>  # Basic helpers built in scripts/
> -PHONY += scripts_basic
> -scripts_basic:
> +PHONY += scripts_basic gcc-plugins
> +scripts_basic: gcc-plugins
>         $(Q)$(MAKE) $(build)=scripts/basic
>         $(Q)rm -f .tmp_quiet_recordmcount
>
> @@ -623,6 +623,8 @@ endif
>  # Tell gcc to never replace conditional load with a non-conditional one
>  KBUILD_CFLAGS  += $(call cc-option,--param=allow-store-data-races=0)
>
> +include scripts/Makefile.gcc-plugins
> +
>  ifdef CONFIG_READABLE_ASM
>  # Disable optimizations that make assembler listings hard to read.
>  # reorder blocks reorders the control in the function
> @@ -946,6 +948,8 @@ endif
>
>  # The actual objects are generated when descending,
>  # make sure no implicit rule kicks in
> +$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
>
>  # Handle descending into subdirectories listed in $(vmlinux-dirs)
> @@ -955,7 +959,7 @@ $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
>  # Error messages still appears in the original language
>
>  PHONY += $(vmlinux-dirs)
> -$(vmlinux-dirs): prepare scripts
> +$(vmlinux-dirs): gcc-plugins prepare scripts
>         $(Q)$(MAKE) $(build)=$@
>
>  define filechk_kernel.release
> @@ -998,10 +1002,13 @@ prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
>
>  archprepare: archheaders archscripts prepare1 scripts_basic
>
> +prepare0: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +prepare0: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  prepare0: archprepare FORCE
>         $(Q)$(MAKE) $(build)=.
>
>  # All the preparing..
> +prepare: KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
>  prepare: prepare0
>
>  # Generate some files
> @@ -1120,6 +1127,8 @@ all: modules
>  # using awk while concatenating to the final file.
>
>  PHONY += modules
> +modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
>         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
>         @$(kecho) '  Building modules, stage 2.';
> @@ -1135,7 +1144,7 @@ modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
>
>  # Target to prepare building external modules
>  PHONY += modules_prepare
> -modules_prepare: prepare scripts
> +modules_prepare: gcc-plugins prepare scripts
>
>  # Target to install modules
>  PHONY += modules_install
> @@ -1240,7 +1249,7 @@ distclean: mrproper
>         @find $(srctree) $(RCS_FIND_IGNORE) \
>                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
>                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
> -               -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
> +               -o -name '.*.rej' -o -name '*.so' -o -name '*%' -o -name 'core' \) \
>                 -type f -print | xargs rm -f

It dawns on me that leaving the .so files around for out-of-tree
builds creates an interesting situation for distros (at least
Debian/Ubuntu), in that right now the "how to build out-of-tree" just
requires installing the headers package (which is arch-agnostic).
Leaving these will mean distros need a new arch-dep package that holds
these artifacts, IIUC. (This is not a complaint at all, just an
observation about what we'll have to help distros understand.)

>
>
> @@ -1409,6 +1418,8 @@ PHONY += $(module-dirs) modules
>  $(module-dirs): crmodverdir $(objtree)/Module.symvers
>         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
>
> +modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  modules: $(module-dirs)
>         @$(kecho) '  Building modules, stage 2.';
>         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
> @@ -1550,17 +1561,21 @@ else
>          target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
>  endif
>
> -%.s: %.c prepare scripts FORCE
> +%.s: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.s: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%.s: %.c gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.i: %.c prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> -%.o: %.c prepare scripts FORCE
> +%.o: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.o: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%.o: %.c gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.lst: %.c prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> -%.s: %.S prepare scripts FORCE
> +%.s: %.S gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> -%.o: %.S prepare scripts FORCE
> +%.o: %.S gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.symtypes: %.c prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> @@ -1572,11 +1587,15 @@ endif
>         $(build)=$(build-dir)
>  # Make sure the latest headers are built for Documentation
>  Documentation/: headers_install
> -%/: prepare scripts FORCE
> +%/: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%/: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%/: gcc-plugins prepare scripts FORCE
>         $(cmd_crmodverdir)
>         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
>         $(build)=$(build-dir)
> -%.ko: prepare scripts FORCE
> +%.ko: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.ko: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%.ko: gcc-plugins prepare scripts FORCE
>         $(cmd_crmodverdir)
>         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
>         $(build)=$(build-dir) $(@:.ko=.o)
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 155e6cd..4c54ef0 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -357,6 +357,19 @@ config SECCOMP_FILTER
>
>           See Documentation/prctl/seccomp_filter.txt for details.
>
> +config HAVE_GCC_PLUGINS
> +       bool
> +       help
> +         An arch should select this symbol if it supports building with
> +         GCC plugins.
> +
> +menuconfig GCC_PLUGINS
> +       bool "GCC plugins"
> +       depends on HAVE_GCC_PLUGINS
> +       help
> +         GCC plugins are loadable modules that provide extra features to the
> +         compiler. They are useful for runtime instrumentation and static analysis.
> +
>  config HAVE_CC_STACKPROTECTOR
>         bool
>         help
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index c8e7314..c221fbc 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -157,6 +157,7 @@ config X86
>         select VIRT_TO_BUS
>         select X86_DEV_DMA_OPS                  if X86_64
>         select X86_FEATURE_NAMES                if PROC_FS
> +       select HAVE_GCC_PLUGINS
>         select ARCH_USES_HIGH_VMA_FLAGS         if X86_INTEL_MEMORY_PROTECTION_KEYS
>         select ARCH_HAS_PKEYS                   if X86_INTEL_MEMORY_PROTECTION_KEYS
>
> diff --git a/init/Makefile b/init/Makefile
> index 7bc47ee..6da2dc7 100644
> --- a/init/Makefile
> +++ b/init/Makefile
> @@ -2,6 +2,9 @@
>  # Makefile for the linux kernel.
>  #
>
> +ccflags-y := $(GCC_PLUGINS_CFLAGS)
> +asflags-y := $(GCC_PLUGINS_AFLAGS)
> +
>  obj-y                          := main.o version.o mounts.o
>  ifneq ($(CONFIG_BLK_DEV_INITRD),y)
>  obj-y                          += noinitramfs.o
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 2c47f9c..9d46008 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -60,7 +60,7 @@ endif
>  endif
>
>  # Do not include host rules unless needed
> -ifneq ($(hostprogs-y)$(hostprogs-m),)
> +ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
>  include scripts/Makefile.host
>  endif
>
> diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
> index 55c96cb..e4e88ab 100644
> --- a/scripts/Makefile.clean
> +++ b/scripts/Makefile.clean
> @@ -38,7 +38,8 @@ subdir-ymn    := $(addprefix $(obj)/,$(subdir-ymn))
>  __clean-files  := $(extra-y) $(extra-m) $(extra-)       \
>                    $(always) $(targets) $(clean-files)   \
>                    $(host-progs)                         \
> -                  $(hostprogs-y) $(hostprogs-m) $(hostprogs-)
> +                  $(hostprogs-y) $(hostprogs-m) $(hostprogs-) \
> +                  $(hostlibs-y) $(hostlibs-m) $(hostlibs-)
>
>  __clean-files   := $(filter-out $(no-clean-files), $(__clean-files))
>
> diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
> new file mode 100644
> index 0000000..7c85bf2
> --- /dev/null
> +++ b/scripts/Makefile.gcc-plugins
> @@ -0,0 +1,28 @@
> +ifdef CONFIG_GCC_PLUGINS
> +ifeq ($(call cc-ifversion, -ge, 0408, y), y)
> +PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(HOSTCXX)" "$(HOSTCXX)" "$(CC)")
> +else
> +PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(HOSTCC)" "$(HOSTCXX)" "$(CC)")
> +endif
> +ifneq ($(PLUGINCC),)
> +export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGINS_AFLAGS
> +ifeq ($(KBUILD_EXTMOD),)
> +gcc-plugins:
> +       $(Q)$(MAKE) $(build)=tools/gcc
> +else
> +gcc-plugins: ;
> +endif
> +else
> +gcc-plugins:
> +ifeq ($(call cc-ifversion, -ge, 0405, y), y)
> +       $(warning warning, your gcc installation does not support plugins, perhaps the necessary headers are missing?)
> +ifeq ($(call cc-ifversion, -ge, 0408, y), y)
> +       $(CONFIG_SHELL) -x $(srctree)/scripts/gcc-plugin.sh "$(HOSTCXX)" "$(HOSTCXX)" "$(CC)"
> +else
> +       $(CONFIG_SHELL) -x $(srctree)/scripts/gcc-plugin.sh "$(HOSTCC)" "$(HOSTCXX)" "$(CC)"
> +endif
> +else
> +       $(warning warning, your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least)
> +endif
> +endif
> +endif
> diff --git a/scripts/Makefile.host b/scripts/Makefile.host
> index 133edfa..4d180d9 100644
> --- a/scripts/Makefile.host
> +++ b/scripts/Makefile.host
> @@ -20,7 +20,25 @@
>  # Will compile qconf as a C++ program, and menu as a C program.
>  # They are linked as C++ code to the executable qconf
>
> +# hostprogs-y := conf
> +# conf-objs  := conf.o libkconfig.so
> +# libkconfig-objs := expr.o type.o
> +# Will create a shared library named libkconfig.so that consists of
> +# expr.o and type.o (they are both compiled as C code and the object files
> +# are made as position independent code).
> +# conf.c is compiled as a C program, and conf.o is linked together with
> +# libkconfig.so as the executable conf.
> +# Note: Shared libraries consisting of C++ files are not supported
> +
> +# hostcc-option
> +# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
> +
> +hostcc-option = $(call try-run,\
> +       $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
> +
>  __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
> +__hostlibs := $(sort $(hostlibs-y) $(hostlibs-m))
> +__hostcxxlibs := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
>
>  # C code
>  # Executables compiled from a single .c file
> @@ -42,6 +60,19 @@ host-cxxmulti        := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
>  # C++ Object (.o) files compiled from .cc files
>  host-cxxobjs   := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
>
> +# Shared libaries (only .c supported)
> +# Shared libraries (.so) - all .so files referenced in "xxx-objs"
> +host-cshlib    := $(sort $(filter %.so, $(host-cobjs)))
> +host-cshlib    += $(sort $(filter %.so, $(__hostlibs)))
> +host-cxxshlib  := $(sort $(filter %.so, $(__hostcxxlibs)))
> +# Remove .so files from "xxx-objs"
> +host-cobjs     := $(filter-out %.so,$(host-cobjs))
> +host-cxxobjs   := $(filter-out %.so,$(host-cxxobjs))
> +
> +# Object (.o) files used by the shared libaries
> +host-cshobjs   := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
> +host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
> +
>  # output directory for programs/.o files
>  # hostprogs-y := tools/build may have been specified.
>  # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
> @@ -56,6 +87,10 @@ host-cmulti  := $(addprefix $(obj)/,$(host-cmulti))
>  host-cobjs     := $(addprefix $(obj)/,$(host-cobjs))
>  host-cxxmulti  := $(addprefix $(obj)/,$(host-cxxmulti))
>  host-cxxobjs   := $(addprefix $(obj)/,$(host-cxxobjs))
> +host-cshlib    := $(addprefix $(obj)/,$(host-cshlib))
> +host-cxxshlib  := $(addprefix $(obj)/,$(host-cxxshlib))
> +host-cshobjs   := $(addprefix $(obj)/,$(host-cshobjs))
> +host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
>  host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
>
>  obj-dirs += $(host-objdirs)
> @@ -124,5 +159,37 @@ quiet_cmd_host-cxxobjs     = HOSTCXX $@
>  $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
>         $(call if_changed_dep,host-cxxobjs)
>
> +# Compile .c file, create position independent .o file
> +# host-cshobjs -> .o
> +quiet_cmd_host-cshobjs = HOSTCC  -fPIC $@
> +      cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
> +$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
> +       $(call if_changed_dep,host-cshobjs)
> +
> +# Compile .c file, create position independent .o file
> +# host-cxxshobjs -> .o
> +quiet_cmd_host-cxxshobjs       = HOSTCXX -fPIC $@
> +      cmd_host-cxxshobjs       = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
> +$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
> +       $(call if_changed_dep,host-cxxshobjs)
> +
> +# Link a shared library, based on position independent .o files
> +# *.o -> .so shared library (host-cshlib)
> +quiet_cmd_host-cshlib  = HOSTLLD -shared $@
> +      cmd_host-cshlib  = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
> +                         $(addprefix $(obj)/,$($(@F:.so=-objs))) \
> +                         $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
> +$(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE
> +       $(call if_changed,host-cshlib)
> +
> +# Link a shared library, based on position independent .o files
> +# *.o -> .so shared library (host-cxxshlib)
> +quiet_cmd_host-cxxshlib        = HOSTLLD -shared $@
> +      cmd_host-cxxshlib        = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
> +                         $(addprefix $(obj)/,$($(@F:.so=-objs))) \
> +                         $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
> +$(host-cxxshlib): $(obj)/%: $(host-cxxshobjs) FORCE
> +       $(call if_changed,host-cxxshlib)
> +
>  targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
> -          $(host-cxxmulti) $(host-cxxobjs)
> +          $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
> diff --git a/scripts/gcc-plugin.sh b/scripts/gcc-plugin.sh
> new file mode 100644
> index 0000000..eaa4fce
> --- /dev/null
> +++ b/scripts/gcc-plugin.sh
> @@ -0,0 +1,51 @@
> +#!/bin/sh
> +srctree=$(dirname "$0")
> +gccplugins_dir=$($3 -print-file-name=plugin)
> +plugincc=$($1 -E -x c++ - -o /dev/null -I"${srctree}"/../tools/gcc -I"${gccplugins_dir}"/include 2>&1 <<EOF
> +#include "gcc-common.h"
> +#if BUILDING_GCC_VERSION >= 4008 || defined(ENABLE_BUILD_WITH_CXX)
> +#warning $2 CXX
> +#else
> +#warning $1 CC
> +#endif
> +EOF
> +)
> +
> +if [ $? -ne 0 ]
> +then
> +       exit 1
> +fi
> +
> +case "$plugincc" in
> +       *"$1 CC"*)
> +               echo "$1"
> +               exit 0
> +               ;;
> +
> +       *"$2 CXX"*)
> +               # the c++ compiler needs another test, see below
> +               ;;
> +
> +       *)
> +               exit 1
> +               ;;
> +esac
> +
> +# we need a c++ compiler that supports the designated initializer GNU extension
> +plugincc=$($2 -c -x c++ -std=gnu++98 - -fsyntax-only -I"${srctree}"/../tools/gcc -I"${gccplugins_dir}"/include 2>&1 <<EOF
> +#include "gcc-common.h"
> +class test {
> +public:
> +       int test;
> +} test = {
> +       .test = 1
> +};
> +EOF
> +)
> +
> +if [ $? -eq 0 ]
> +then
> +       echo "$2"
> +       exit 0
> +fi
> +exit 1
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> index 49d61ad..69ee2cf 100755
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@ -184,7 +184,7 @@ else
>  fi;
>
>  # final build of init/
> -${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
> +${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}" GCC_PLUGINS_AFLAGS="${GCC_PLUGINS_AFLAGS}"
>
>  kallsymso=""
>  kallsyms_vmlinux=""
> diff --git a/scripts/package/builddeb b/scripts/package/builddeb
> index 6c3b038..54e0b5e 100755
> --- a/scripts/package/builddeb
> +++ b/scripts/package/builddeb
> @@ -326,6 +326,7 @@ fi
>  (cd $srctree; find arch/$SRCARCH -name module.lds -o -name Kbuild.platforms -o -name Platform) >> "$objtree/debian/hdrsrcfiles"
>  (cd $srctree; find $(find arch/$SRCARCH -name include -o -name scripts -type d) -type f) >> "$objtree/debian/hdrsrcfiles"
>  (cd $objtree; find arch/$SRCARCH/include Module.symvers include scripts -type f) >> "$objtree/debian/hdrobjfiles"
> +(cd $objtree; find tools/gcc -name \*.so -o -name gcc-common.h) >> "$objtree/debian/hdrobjfiles"
>  destdir=$kernel_headers_dir/usr/src/linux-headers-$version
>  mkdir -p "$destdir"
>  (cd $srctree; tar -c -f - -T -) < "$objtree/debian/hdrsrcfiles" | (cd $destdir; tar -xf -)
> diff --git a/tools/gcc/Makefile b/tools/gcc/Makefile
> new file mode 100644
> index 0000000..b2d64af
> --- /dev/null
> +++ b/tools/gcc/Makefile
> @@ -0,0 +1,15 @@
> +GCC_PLUGINS_DIR := $(shell $(CC) -print-file-name=plugin)
> +
> +ifeq ($(PLUGINCC),$(HOSTCC))
> +HOSTLIBS := hostlibs
> +HOST_EXTRACFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu99 -ggdb
> +export HOST_EXTRACFLAGS
> +else
> +HOSTLIBS := hostcxxlibs
> +HOST_EXTRACXXFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu++98 -fno-rtti -fno-exceptions -fasynchronous-unwind-tables -ggdb -Wno-narrowing -Wno-unused-variable
> +export HOST_EXTRACXXFLAGS
> +endif
> +
> +export GCCPLUGINS_DIR HOSTLIBS
> +
> +always := $($(HOSTLIBS)-y)
> diff --git a/tools/gcc/gcc-common.h b/tools/gcc/gcc-common.h
> new file mode 100644
> index 0000000..44a9200
> --- /dev/null
> +++ b/tools/gcc/gcc-common.h
> @@ -0,0 +1,803 @@
> +#ifndef GCC_COMMON_H_INCLUDED
> +#define GCC_COMMON_H_INCLUDED
> +
> +#include "bversion.h"
> +#if BUILDING_GCC_VERSION >= 6000
> +#include "gcc-plugin.h"
> +#else
> +#include "plugin.h"
> +#endif
> +#include "plugin-version.h"
> +#include "config.h"
> +#include "system.h"
> +#include "coretypes.h"
> +#include "tm.h"
> +#include "line-map.h"
> +#include "input.h"
> +#include "tree.h"
> +
> +#include "tree-inline.h"
> +#include "version.h"
> +#include "rtl.h"
> +#include "tm_p.h"
> +#include "flags.h"
> +#include "hard-reg-set.h"
> +#include "output.h"
> +#include "except.h"
> +#include "function.h"
> +#include "toplev.h"
> +#include "basic-block.h"
> +#include "intl.h"
> +#include "ggc.h"
> +#include "timevar.h"
> +
> +#include "params.h"
> +
> +#if BUILDING_GCC_VERSION <= 4009
> +#include "pointer-set.h"
> +#else
> +#include "hash-map.h"
> +#endif
> +
> +#include "emit-rtl.h"
> +#include "debug.h"
> +#include "target.h"
> +#include "langhooks.h"
> +#include "cfgloop.h"
> +#include "cgraph.h"
> +#include "opts.h"
> +
> +#if BUILDING_GCC_VERSION == 4005
> +#include <sys/mman.h>
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4007
> +#include "tree-pretty-print.h"
> +#include "gimple-pretty-print.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4006
> +#include "c-family/c-common.h"
> +#else
> +#include "c-common.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4008
> +#include "tree-flow.h"
> +#else
> +#include "tree-cfgcleanup.h"
> +#include "tree-ssa-operands.h"
> +#include "tree-into-ssa.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4008
> +#include "is-a.h"
> +#endif
> +
> +#include "diagnostic.h"
> +#include "tree-dump.h"
> +#include "tree-pass.h"
> +#include "predict.h"
> +#include "ipa-utils.h"
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +#include "attribs.h"
> +#include "varasm.h"
> +#include "stor-layout.h"
> +#include "internal-fn.h"
> +#include "gimple-expr.h"
> +#include "gimple-fold.h"
> +#include "context.h"
> +#include "tree-ssa-alias.h"
> +#include "tree-ssa.h"
> +#include "stringpool.h"
> +#include "tree-ssanames.h"
> +#include "print-tree.h"
> +#include "tree-eh.h"
> +#include "stmt.h"
> +#include "gimplify.h"
> +#endif
> +
> +#include "gimple.h"
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +#include "tree-ssa-operands.h"
> +#include "tree-phinodes.h"
> +#include "tree-cfg.h"
> +#include "gimple-iterator.h"
> +#include "gimple-ssa.h"
> +#include "ssa-iterators.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 5000
> +#include "builtins.h"
> +#endif
> +
> +/* #include "expr.h" where are you... */
> +extern rtx emit_move_insn(rtx x, rtx y);
> +
> +/* missing from basic_block.h... */
> +extern void debug_dominance_info(enum cdi_direction dir);
> +extern void debug_dominance_tree(enum cdi_direction dir, basic_block root);
> +
> +#if BUILDING_GCC_VERSION == 4006
> +extern void debug_gimple_stmt(gimple);
> +extern void debug_gimple_seq(gimple_seq);
> +extern void print_gimple_seq(FILE *, gimple_seq, int, int);
> +extern void print_gimple_stmt(FILE *, gimple, int, int);
> +extern void print_gimple_expr(FILE *, gimple, int, int);
> +extern void dump_gimple_stmt(pretty_printer *, gimple, int, int);
> +#endif
> +
> +#ifdef __cplusplus
> +static inline void debug_tree(const_tree t)
> +{
> +       debug_tree(CONST_CAST_TREE(t));
> +}
> +
> +static inline void debug_gimple_stmt(const_gimple s)
> +{
> +       debug_gimple_stmt(CONST_CAST_GIMPLE(s));
> +}
> +#else
> +#define debug_tree(t) debug_tree(CONST_CAST_TREE(t))
> +#define debug_gimple_stmt(s) debug_gimple_stmt(CONST_CAST_GIMPLE(s))
> +#endif
> +
> +#define __unused __attribute__((__unused__))
> +
> +#define DECL_NAME_POINTER(node) IDENTIFIER_POINTER(DECL_NAME(node))
> +#define DECL_NAME_LENGTH(node) IDENTIFIER_LENGTH(DECL_NAME(node))
> +#define TYPE_NAME_POINTER(node) IDENTIFIER_POINTER(TYPE_NAME(node))
> +#define TYPE_NAME_LENGTH(node) IDENTIFIER_LENGTH(TYPE_NAME(node))
> +
> +/* should come from c-tree.h if only it were installed for gcc 4.5... */
> +#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1(TYPE)
> +
> +#if BUILDING_GCC_VERSION == 4005
> +#define FOR_EACH_LOCAL_DECL(FUN, I, D)                 \
> +       for (tree vars = (FUN)->local_decls, (I) = 0;   \
> +               vars && ((D) = TREE_VALUE(vars));       \
> +               vars = TREE_CHAIN(vars), (I)++)
> +#define DECL_CHAIN(NODE) (TREE_CHAIN(DECL_MINIMAL_CHECK(NODE)))
> +#define FOR_EACH_VEC_ELT(T, V, I, P) \
> +       for (I = 0; VEC_iterate(T, (V), (I), (P)); ++(I))
> +#define TODO_rebuild_cgraph_edges 0
> +#define SCOPE_FILE_SCOPE_P(EXP) (!(EXP))
> +
> +#ifndef O_BINARY
> +#define O_BINARY 0
> +#endif
> +
> +typedef struct varpool_node *varpool_node_ptr;
> +
> +static inline bool gimple_call_builtin_p(gimple stmt, enum built_in_function code)
> +{
> +       tree fndecl;
> +
> +       if (!is_gimple_call(stmt))
> +               return false;
> +       fndecl = gimple_call_fndecl(stmt);
> +       if (!fndecl || DECL_BUILT_IN_CLASS(fndecl) != BUILT_IN_NORMAL)
> +               return false;
> +       return DECL_FUNCTION_CODE(fndecl) == code;
> +}
> +
> +static inline bool is_simple_builtin(tree decl)
> +{
> +       if (decl && DECL_BUILT_IN_CLASS(decl) != BUILT_IN_NORMAL)
> +               return false;
> +
> +       switch (DECL_FUNCTION_CODE(decl)) {
> +       /* Builtins that expand to constants. */
> +       case BUILT_IN_CONSTANT_P:
> +       case BUILT_IN_EXPECT:
> +       case BUILT_IN_OBJECT_SIZE:
> +       case BUILT_IN_UNREACHABLE:
> +       /* Simple register moves or loads from stack. */
> +       case BUILT_IN_RETURN_ADDRESS:
> +       case BUILT_IN_EXTRACT_RETURN_ADDR:
> +       case BUILT_IN_FROB_RETURN_ADDR:
> +       case BUILT_IN_RETURN:
> +       case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
> +       case BUILT_IN_FRAME_ADDRESS:
> +       case BUILT_IN_VA_END:
> +       case BUILT_IN_STACK_SAVE:
> +       case BUILT_IN_STACK_RESTORE:
> +       /* Exception state returns or moves registers around. */
> +       case BUILT_IN_EH_FILTER:
> +       case BUILT_IN_EH_POINTER:
> +       case BUILT_IN_EH_COPY_VALUES:
> +       return true;
> +
> +       default:
> +       return false;
> +       }
> +}
> +
> +static inline void add_local_decl(struct function *fun, tree d)
> +{
> +       gcc_assert(TREE_CODE(d) == VAR_DECL);
> +       fun->local_decls = tree_cons(NULL_TREE, d, fun->local_decls);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4006
> +#define ANY_RETURN_P(rtx) (GET_CODE(rtx) == RETURN)
> +#define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4(EXP)
> +#define EDGE_PRESERVE 0ULL
> +#define HOST_WIDE_INT_PRINT_HEX_PURE "%" HOST_WIDE_INT_PRINT "x"
> +#define flag_fat_lto_objects true
> +
> +#define get_random_seed(noinit) ({                                             \
> +       unsigned HOST_WIDE_INT seed;                                            \
> +       sscanf(get_random_seed(noinit), "%" HOST_WIDE_INT_PRINT "x", &seed);    \
> +       seed * seed; })
> +
> +#define int_const_binop(code, arg1, arg2)      \
> +       int_const_binop((code), (arg1), (arg2), 0)
> +
> +static inline bool gimple_clobber_p(gimple s __unused)
> +{
> +       return false;
> +}
> +
> +static inline bool gimple_asm_clobbers_memory_p(const_gimple stmt)
> +{
> +       unsigned i;
> +
> +       for (i = 0; i < gimple_asm_nclobbers(stmt); i++) {
> +               tree op = gimple_asm_clobber_op(stmt, i);
> +
> +               if (!strcmp(TREE_STRING_POINTER(TREE_VALUE(op)), "memory"))
> +                       return true;
> +       }
> +
> +       return false;
> +}
> +
> +static inline tree builtin_decl_implicit(enum built_in_function fncode)
> +{
> +       return implicit_built_in_decls[fncode];
> +}
> +
> +static inline int ipa_reverse_postorder(struct cgraph_node **order)
> +{
> +       return cgraph_postorder(order);
> +}
> +
> +static inline struct cgraph_node *cgraph_get_create_node(tree decl)
> +{
> +       struct cgraph_node *node = cgraph_get_node(decl);
> +
> +       return node ? node : cgraph_node(decl);
> +}
> +
> +static inline bool cgraph_function_with_gimple_body_p(struct cgraph_node *node)
> +{
> +       return node->analyzed && !node->thunk.thunk_p && !node->alias;
> +}
> +
> +static inline struct cgraph_node *cgraph_first_function_with_gimple_body(void)
> +{
> +       struct cgraph_node *node;
> +
> +       for (node = cgraph_nodes; node; node = node->next)
> +               if (cgraph_function_with_gimple_body_p(node))
> +                       return node;
> +       return NULL;
> +}
> +
> +static inline struct cgraph_node *cgraph_next_function_with_gimple_body(struct cgraph_node *node)
> +{
> +       for (node = node->next; node; node = node->next)
> +               if (cgraph_function_with_gimple_body_p(node))
> +                       return node;
> +       return NULL;
> +}
> +
> +#define FOR_EACH_FUNCTION_WITH_GIMPLE_BODY(node) \
> +       for ((node) = cgraph_first_function_with_gimple_body(); (node); \
> +               (node) = cgraph_next_function_with_gimple_body(node))
> +
> +static inline void varpool_add_new_variable(tree decl)
> +{
> +       varpool_finalize_decl(decl);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4007
> +#define FOR_EACH_FUNCTION(node)        \
> +       for (node = cgraph_nodes; node; node = node->next)
> +#define FOR_EACH_VARIABLE(node)        \
> +       for (node = varpool_nodes; node; node = node->next)
> +#define PROP_loops 0
> +#define NODE_SYMBOL(node) (node)
> +#define NODE_DECL(node) (node)->decl
> +#define INSN_LOCATION(INSN) RTL_LOCATION(INSN)
> +
> +static inline int bb_loop_depth(const_basic_block bb)
> +{
> +       return bb->loop_father ? loop_depth(bb->loop_father) : 0;
> +}
> +
> +static inline bool gimple_store_p(gimple gs)
> +{
> +       tree lhs = gimple_get_lhs(gs);
> +
> +       return lhs && !is_gimple_reg(lhs);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION == 4007 || BUILDING_GCC_VERSION == 4008
> +static inline struct cgraph_node *cgraph_alias_target(struct cgraph_node *n)
> +{
> +       return cgraph_alias_aliased_node(n);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4007 && BUILDING_GCC_VERSION <= 4009
> +#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
> +       cgraph_create_edge((caller), (callee), (call_stmt), (count), (freq))
> +#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
> +       cgraph_create_edge_including_clones((caller), (callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4008
> +#define ENTRY_BLOCK_PTR_FOR_FN(FN)     ENTRY_BLOCK_PTR_FOR_FUNCTION(FN)
> +#define EXIT_BLOCK_PTR_FOR_FN(FN)      EXIT_BLOCK_PTR_FOR_FUNCTION(FN)
> +#define basic_block_info_for_fn(FN)    ((FN)->cfg->x_basic_block_info)
> +#define n_basic_blocks_for_fn(FN)      ((FN)->cfg->x_n_basic_blocks)
> +#define n_edges_for_fn(FN)             ((FN)->cfg->x_n_edges)
> +#define last_basic_block_for_fn(FN)    ((FN)->cfg->x_last_basic_block)
> +#define label_to_block_map_for_fn(FN)  ((FN)->cfg->x_label_to_block_map)
> +#define profile_status_for_fn(FN)      ((FN)->cfg->x_profile_status)
> +#define BASIC_BLOCK_FOR_FN(FN, N)      BASIC_BLOCK_FOR_FUNCTION((FN), (N))
> +#define NODE_IMPLICIT_ALIAS(node)      (node)->same_body_alias
> +#define VAR_P(NODE)                    (TREE_CODE(NODE) == VAR_DECL)
> +
> +static inline bool tree_fits_shwi_p(const_tree t)
> +{
> +       if (t == NULL_TREE || TREE_CODE(t) != INTEGER_CST)
> +               return false;
> +
> +       if (TREE_INT_CST_HIGH(t) == 0 && (HOST_WIDE_INT)TREE_INT_CST_LOW(t) >= 0)
> +               return true;
> +
> +       if (TREE_INT_CST_HIGH(t) == -1 && (HOST_WIDE_INT)TREE_INT_CST_LOW(t) < 0 && !TYPE_UNSIGNED(TREE_TYPE(t)))
> +               return true;
> +
> +       return false;
> +}
> +
> +static inline bool tree_fits_uhwi_p(const_tree t)
> +{
> +       if (t == NULL_TREE || TREE_CODE(t) != INTEGER_CST)
> +               return false;
> +
> +       return TREE_INT_CST_HIGH(t) == 0;
> +}
> +
> +static inline HOST_WIDE_INT tree_to_shwi(const_tree t)
> +{
> +       gcc_assert(tree_fits_shwi_p(t));
> +       return TREE_INT_CST_LOW(t);
> +}
> +
> +static inline unsigned HOST_WIDE_INT tree_to_uhwi(const_tree t)
> +{
> +       gcc_assert(tree_fits_uhwi_p(t));
> +       return TREE_INT_CST_LOW(t);
> +}
> +
> +static inline const char *get_tree_code_name(enum tree_code code)
> +{
> +       gcc_assert(code < MAX_TREE_CODES);
> +       return tree_code_name[code];
> +}
> +
> +#define ipa_remove_stmt_references(cnode, stmt)
> +
> +typedef union gimple_statement_d gasm;
> +typedef union gimple_statement_d gassign;
> +typedef union gimple_statement_d gcall;
> +typedef union gimple_statement_d gcond;
> +typedef union gimple_statement_d gdebug;
> +typedef union gimple_statement_d gphi;
> +typedef union gimple_statement_d greturn;
> +
> +static inline gasm *as_a_gasm(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gasm *as_a_const_gasm(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gassign *as_a_gassign(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gassign *as_a_const_gassign(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gcall *as_a_gcall(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gcall *as_a_const_gcall(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gcond *as_a_gcond(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gcond *as_a_const_gcond(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gdebug *as_a_gdebug(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gdebug *as_a_const_gdebug(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gphi *as_a_gphi(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gphi *as_a_const_gphi(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline greturn *as_a_greturn(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const greturn *as_a_const_greturn(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION == 4008
> +#define NODE_SYMBOL(node) (&(node)->symbol)
> +#define NODE_DECL(node) (node)->symbol.decl
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4008
> +#define add_referenced_var(var)
> +#define mark_sym_for_renaming(var)
> +#define varpool_mark_needed_node(node)
> +#define create_var_ann(var)
> +#define TODO_dump_func 0
> +#define TODO_dump_cgraph 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4009
> +#define TODO_verify_il 0
> +#define AVAIL_INTERPOSABLE AVAIL_OVERWRITABLE
> +
> +#define section_name_prefix LTO_SECTION_NAME_PREFIX
> +#define fatal_error(loc, gmsgid, ...) fatal_error((gmsgid), __VA_ARGS__)
> +
> +typedef struct rtx_def rtx_insn;
> +
> +static inline void set_decl_section_name(tree node, const char *value)
> +{
> +       DECL_SECTION_NAME(node) = build_string(strlen(value) + 1, value);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION == 4009
> +typedef struct gimple_statement_asm gasm;
> +typedef struct gimple_statement_base gassign;
> +typedef struct gimple_statement_call gcall;
> +typedef struct gimple_statement_base gcond;
> +typedef struct gimple_statement_base gdebug;
> +typedef struct gimple_statement_phi gphi;
> +typedef struct gimple_statement_base greturn;
> +
> +static inline gasm *as_a_gasm(gimple stmt)
> +{
> +       return as_a<gasm>(stmt);
> +}
> +
> +static inline const gasm *as_a_const_gasm(const_gimple stmt)
> +{
> +       return as_a<const gasm>(stmt);
> +}
> +
> +static inline gassign *as_a_gassign(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gassign *as_a_const_gassign(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gcall *as_a_gcall(gimple stmt)
> +{
> +       return as_a<gcall>(stmt);
> +}
> +
> +static inline const gcall *as_a_const_gcall(const_gimple stmt)
> +{
> +       return as_a<const gcall>(stmt);
> +}
> +
> +static inline gcond *as_a_gcond(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gcond *as_a_const_gcond(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gdebug *as_a_gdebug(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gdebug *as_a_const_gdebug(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gphi *as_a_gphi(gimple stmt)
> +{
> +       return as_a<gphi>(stmt);
> +}
> +
> +static inline const gphi *as_a_const_gphi(const_gimple stmt)
> +{
> +       return as_a<const gphi>(stmt);
> +}
> +
> +static inline greturn *as_a_greturn(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const greturn *as_a_const_greturn(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +#define TODO_ggc_collect 0
> +#define NODE_SYMBOL(node) (node)
> +#define NODE_DECL(node) (node)->decl
> +#define cgraph_node_name(node) (node)->name()
> +#define NODE_IMPLICIT_ALIAS(node) (node)->cpp_implicit_alias
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 5000 && BUILDING_GCC_VERSION < 6000
> +/* gimple related */
> +template <>
> +template <>
> +inline bool is_a_helper<const gassign *>::test(const_gimple gs)
> +{
> +       return gs->code == GIMPLE_ASSIGN;
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 5000
> +#define TODO_verify_ssa TODO_verify_il
> +#define TODO_verify_flow TODO_verify_il
> +#define TODO_verify_stmts TODO_verify_il
> +#define TODO_verify_rtl_sharing TODO_verify_il
> +
> +#define INSN_DELETED_P(insn) (insn)->deleted()
> +
> +/* symtab/cgraph related */
> +#define debug_cgraph_node(node) (node)->debug()
> +#define cgraph_get_node(decl) cgraph_node::get(decl)
> +#define cgraph_get_create_node(decl) cgraph_node::get_create(decl)
> +#define cgraph_n_nodes symtab->cgraph_count
> +#define cgraph_max_uid symtab->cgraph_max_uid
> +#define varpool_get_node(decl) varpool_node::get(decl)
> +
> +#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
> +       (caller)->create_edge((callee), (call_stmt), (count), (freq))
> +#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
> +       (caller)->create_edge_including_clones((callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
> +
> +typedef struct cgraph_node *cgraph_node_ptr;
> +typedef struct cgraph_edge *cgraph_edge_p;
> +typedef struct varpool_node *varpool_node_ptr;
> +
> +static inline void change_decl_assembler_name(tree decl, tree name)
> +{
> +       symtab->change_decl_assembler_name(decl, name);
> +}
> +
> +static inline void varpool_finalize_decl(tree decl)
> +{
> +       varpool_node::finalize_decl(decl);
> +}
> +
> +static inline void varpool_add_new_variable(tree decl)
> +{
> +       varpool_node::add(decl);
> +}
> +
> +static inline unsigned int rebuild_cgraph_edges(void)
> +{
> +       return cgraph_edge::rebuild_edges();
> +}
> +
> +static inline cgraph_node_ptr cgraph_function_node(cgraph_node_ptr node, enum availability *availability)
> +{
> +       return node->function_symbol(availability);
> +}
> +
> +static inline cgraph_node_ptr cgraph_function_or_thunk_node(cgraph_node_ptr node, enum availability *availability = NULL)
> +{
> +       return node->ultimate_alias_target(availability);
> +}
> +
> +static inline bool cgraph_only_called_directly_p(cgraph_node_ptr node)
> +{
> +       return node->only_called_directly_p();
> +}
> +
> +static inline enum availability cgraph_function_body_availability(cgraph_node_ptr node)
> +{
> +       return node->get_availability();
> +}
> +
> +static inline cgraph_node_ptr cgraph_alias_target(cgraph_node_ptr node)
> +{
> +       return node->get_alias_target();
> +}
> +
> +static inline struct cgraph_node_hook_list *cgraph_add_function_insertion_hook(cgraph_node_hook hook, void *data)
> +{
> +       return symtab->add_cgraph_insertion_hook(hook, data);
> +}
> +
> +static inline void cgraph_remove_function_insertion_hook(struct cgraph_node_hook_list *entry)
> +{
> +       symtab->remove_cgraph_insertion_hook(entry);
> +}
> +
> +static inline struct cgraph_node_hook_list *cgraph_add_node_removal_hook(cgraph_node_hook hook, void *data)
> +{
> +       return symtab->add_cgraph_removal_hook(hook, data);
> +}
> +
> +static inline void cgraph_remove_node_removal_hook(struct cgraph_node_hook_list *entry)
> +{
> +       symtab->remove_cgraph_removal_hook(entry);
> +}
> +
> +static inline struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook(cgraph_2node_hook hook, void *data)
> +{
> +       return symtab->add_cgraph_duplication_hook(hook, data);
> +}
> +
> +static inline void cgraph_remove_node_duplication_hook(struct cgraph_2node_hook_list *entry)
> +{
> +       symtab->remove_cgraph_duplication_hook(entry);
> +}
> +
> +#if BUILDING_GCC_VERSION >= 6000
> +typedef gimple *gimple_ptr;
> +typedef const gimple *const_gimple;
> +#define gimple gimple_ptr
> +#endif
> +
> +/* gimple related */
> +static inline gimple gimple_build_assign_with_ops(enum tree_code subcode, tree lhs, tree op1, tree op2 MEM_STAT_DECL)
> +{
> +       return gimple_build_assign(lhs, subcode, op1, op2 PASS_MEM_STAT);
> +}
> +
> +template <>
> +template <>
> +inline bool is_a_helper<const greturn *>::test(const_gimple gs)
> +{
> +       return gs->code == GIMPLE_RETURN;
> +}
> +
> +static inline gasm *as_a_gasm(gimple stmt)
> +{
> +       return as_a<gasm *>(stmt);
> +}
> +
> +static inline const gasm *as_a_const_gasm(const_gimple stmt)
> +{
> +       return as_a<const gasm *>(stmt);
> +}
> +
> +static inline gassign *as_a_gassign(gimple stmt)
> +{
> +       return as_a<gassign *>(stmt);
> +}
> +
> +static inline const gassign *as_a_const_gassign(const_gimple stmt)
> +{
> +       return as_a<const gassign *>(stmt);
> +}
> +
> +static inline gcall *as_a_gcall(gimple stmt)
> +{
> +       return as_a<gcall *>(stmt);
> +}
> +
> +static inline const gcall *as_a_const_gcall(const_gimple stmt)
> +{
> +       return as_a<const gcall *>(stmt);
> +}
> +
> +static inline gphi *as_a_gphi(gimple stmt)
> +{
> +       return as_a<gphi *>(stmt);
> +}
> +
> +static inline const gphi *as_a_const_gphi(const_gimple stmt)
> +{
> +       return as_a<const gphi *>(stmt);
> +}
> +
> +static inline greturn *as_a_greturn(gimple stmt)
> +{
> +       return as_a<greturn *>(stmt);
> +}
> +
> +static inline const greturn *as_a_const_greturn(const_gimple stmt)
> +{
> +       return as_a<const greturn *>(stmt);
> +}
> +
> +/* IPA/LTO related */
> +#define ipa_ref_list_referring_iterate(L, I, P)        \
> +       (L)->referring.iterate((I), &(P))
> +#define ipa_ref_list_reference_iterate(L, I, P)        \
> +       (L)->reference.iterate((I), &(P))
> +
> +static inline cgraph_node_ptr ipa_ref_referring_node(struct ipa_ref *ref)
> +{
> +       return dyn_cast<cgraph_node_ptr>(ref->referring);
> +}
> +
> +static inline void ipa_remove_stmt_references(symtab_node *referring_node, gimple stmt)
> +{
> +       referring_node->remove_stmt_references(stmt);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION < 6000
> +#define get_inner_reference(exp, pbitsize, pbitpos, poffset, pmode, punsignedp, preversep, pvolatilep, keep_aligning)  \
> +       get_inner_reference(exp, pbitsize, pbitpos, poffset, pmode, punsignedp, pvolatilep, keep_aligning)
> +#define gen_rtx_set(ARG0, ARG1) gen_rtx_SET(VOIDmode, (ARG0), (ARG1))
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 6000
> +#define gen_rtx_set(ARG0, ARG1) gen_rtx_SET((ARG0), (ARG1))
> +#endif
> +
> +#endif
> diff --git a/tools/gcc/gcc-generate-gimple-pass.h b/tools/gcc/gcc-generate-gimple-pass.h
> new file mode 100644
> index 0000000..0ba6a0d
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-gimple-pass.h
> @@ -0,0 +1,173 @@
> +/*
> + * Generator for GIMPLE pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct gimple_opt_pass _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = GIMPLE_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       }
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public gimple_opt_pass {
> +public:
> +       _PASS_NAME_PASS() : gimple_opt_pass(_PASS_NAME_PASS_DATA, g) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +
> +#endif /* PASS_NAME */
> diff --git a/tools/gcc/gcc-generate-ipa-pass.h b/tools/gcc/gcc-generate-ipa-pass.h
> new file mode 100644
> index 0000000..283c2e1
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-ipa-pass.h
> @@ -0,0 +1,287 @@
> +/*
> + * Generator for IPA pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GENERATE_SUMMARY
> + *    NO_READ_SUMMARY
> + *    NO_WRITE_SUMMARY
> + *    NO_READ_OPTIMIZATION_SUMMARY
> + *    NO_WRITE_OPTIMIZATION_SUMMARY
> + *    NO_STMT_FIXUP
> + *    NO_FUNCTION_TRANSFORM
> + *    NO_VARIABLE_TRANSFORM
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and *TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GENERATE_SUMMARY
> +#define _GENERATE_SUMMARY NULL
> +#else
> +#define __GENERATE_SUMMARY(n)          _GCC_PLUGIN_CONCAT2(n, _generate_summary)
> +#define _GENERATE_SUMMARY              __GENERATE_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_READ_SUMMARY
> +#define _READ_SUMMARY NULL
> +#else
> +#define __READ_SUMMARY(n)              _GCC_PLUGIN_CONCAT2(n, _read_summary)
> +#define _READ_SUMMARY                  __READ_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_WRITE_SUMMARY
> +#define _WRITE_SUMMARY NULL
> +#else
> +#define __WRITE_SUMMARY(n)             _GCC_PLUGIN_CONCAT2(n, _write_summary)
> +#define _WRITE_SUMMARY                 __WRITE_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_READ_OPTIMIZATION_SUMMARY
> +#define _READ_OPTIMIZATION_SUMMARY NULL
> +#else
> +#define __READ_OPTIMIZATION_SUMMARY(n) _GCC_PLUGIN_CONCAT2(n, _read_optimization_summary)
> +#define _READ_OPTIMIZATION_SUMMARY     __READ_OPTIMIZATION_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_WRITE_OPTIMIZATION_SUMMARY
> +#define _WRITE_OPTIMIZATION_SUMMARY NULL
> +#else
> +#define __WRITE_OPTIMIZATION_SUMMARY(n)        _GCC_PLUGIN_CONCAT2(n, _write_optimization_summary)
> +#define _WRITE_OPTIMIZATION_SUMMARY    __WRITE_OPTIMIZATION_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_STMT_FIXUP
> +#define _STMT_FIXUP NULL
> +#else
> +#define __STMT_FIXUP(n)                        _GCC_PLUGIN_CONCAT2(n, _stmt_fixup)
> +#define _STMT_FIXUP                    __STMT_FIXUP(PASS_NAME)
> +#endif
> +
> +#ifdef NO_FUNCTION_TRANSFORM
> +#define _FUNCTION_TRANSFORM NULL
> +#else
> +#define __FUNCTION_TRANSFORM(n)                _GCC_PLUGIN_CONCAT2(n, _function_transform)
> +#define _FUNCTION_TRANSFORM            __FUNCTION_TRANSFORM(PASS_NAME)
> +#endif
> +
> +#ifdef NO_VARIABLE_TRANSFORM
> +#define _VARIABLE_TRANSFORM NULL
> +#else
> +#define __VARIABLE_TRANSFORM(n)                _GCC_PLUGIN_CONCAT2(n, _variable_transform)
> +#define _VARIABLE_TRANSFORM            __VARIABLE_TRANSFORM(PASS_NAME)
> +#endif
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#ifndef FUNCTION_TRANSFORM_TODO_FLAGS_START
> +#define FUNCTION_TRANSFORM_TODO_FLAGS_START 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct ipa_opt_pass_d _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = IPA_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       },
> +       .generate_summary               = _GENERATE_SUMMARY,
> +       .write_summary                  = _WRITE_SUMMARY,
> +       .read_summary                   = _READ_SUMMARY,
> +#if BUILDING_GCC_VERSION >= 4006
> +       .write_optimization_summary     = _WRITE_OPTIMIZATION_SUMMARY,
> +       .read_optimization_summary      = _READ_OPTIMIZATION_SUMMARY,
> +#endif
> +       .stmt_fixup                     = _STMT_FIXUP,
> +       .function_transform_todo_flags_start    = FUNCTION_TRANSFORM_TODO_FLAGS_START,
> +       .function_transform             = _FUNCTION_TRANSFORM,
> +       .variable_transform             = _VARIABLE_TRANSFORM,
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public ipa_opt_pass_d {
> +public:
> +       _PASS_NAME_PASS() : ipa_opt_pass_d(_PASS_NAME_PASS_DATA,
> +                        g,
> +                        _GENERATE_SUMMARY,
> +                        _WRITE_SUMMARY,
> +                        _READ_SUMMARY,
> +                        _WRITE_OPTIMIZATION_SUMMARY,
> +                        _READ_OPTIMIZATION_SUMMARY,
> +                        _STMT_FIXUP,
> +                        0,
> +                        _FUNCTION_TRANSFORM,
> +                        _VARIABLE_TRANSFORM) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GENERATE_SUMMARY
> +#undef NO_WRITE_SUMMARY
> +#undef NO_READ_SUMMARY
> +#undef NO_WRITE_OPTIMIZATION_SUMMARY
> +#undef NO_READ_OPTIMIZATION_SUMMARY
> +#undef NO_STMT_FIXUP
> +#undef NO_FUNCTION_TRANSFORM
> +#undef NO_VARIABLE_TRANSFORM
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef FUNCTION_TRANSFORM_TODO_FLAGS_START
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _FUNCTION_TRANSFORM
> +#undef __FUNCTION_TRANSFORM
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _GENERATE_SUMMARY
> +#undef __GENERATE_SUMMARY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +#undef _READ_OPTIMIZATION_SUMMARY
> +#undef __READ_OPTIMIZATION_SUMMARY
> +#undef _READ_SUMMARY
> +#undef __READ_SUMMARY
> +#undef _STMT_FIXUP
> +#undef __STMT_FIXUP
> +#undef _VARIABLE_TRANSFORM
> +#undef __VARIABLE_TRANSFORM
> +#undef _WRITE_OPTIMIZATION_SUMMARY
> +#undef __WRITE_OPTIMIZATION_SUMMARY
> +#undef _WRITE_SUMMARY
> +#undef __WRITE_SUMMARY
> +
> +#endif /* PASS_NAME */
> diff --git a/tools/gcc/gcc-generate-rtl-pass.h b/tools/gcc/gcc-generate-rtl-pass.h
> new file mode 100644
> index 0000000..f4cc205
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-rtl-pass.h
> @@ -0,0 +1,173 @@
> +/*
> + * Generator for RTL pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct rtl_opt_pass _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = RTL_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       }
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public rtl_opt_pass {
> +public:
> +       _PASS_NAME_PASS() : rtl_opt_pass(_PASS_NAME_PASS_DATA, g) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +
> +#endif /* PASS_NAME */
> diff --git a/tools/gcc/gcc-generate-simple_ipa-pass.h b/tools/gcc/gcc-generate-simple_ipa-pass.h
> new file mode 100644
> index 0000000..159d5ae
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-simple_ipa-pass.h
> @@ -0,0 +1,173 @@
> +/*
> + * Generator for SIMPLE_IPA pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct simple_ipa_opt_pass _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = SIMPLE_IPA_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       }
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public simple_ipa_opt_pass {
> +public:
> +       _PASS_NAME_PASS() : simple_ipa_opt_pass(_PASS_NAME_PASS_DATA, g) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +
> +#endif /* PASS_NAME */
> --
> 2.4.1
>

-Kees

Kees Cook March 1, 2016, 9:19 p.m. UTC | #2

On Tue, Mar 1, 2016 at 9:15 AM, Emese Revfy <re.emese@gmail.com> wrote:
> This patch allows to build the whole kernel with GCC plugins. It was ported from
> grsecurity/PaX. The infrastructure supports building out-of-tree modules and
> building in a separate directory. Cross-compilation is supported too but
> currently only the x86 architecture enables plugins.
>
> The directory of the gcc plugins is tools/gcc. You can use a file or a directory
> there. The plugins compile with these options:
>  * -fno-rtti: gcc is compiled with this option so the plugins must use it too
>  * -fno-exceptions: this is inherited from gcc too
>  * -fasynchronous-unwind-tables: this is inherited from gcc too
>  * -ggdb: it is useful for debugging a plugin (better backtrace on internal
>     errors)
>  * -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
>  * -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
>     variable, plugin-version.h)
>
> The infrastructure introduces a new Makefile target called gcc-plugins. It
> supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
> chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
> This script also checks the availability of the included headers in
> tools/gcc/gcc-common.h.
>
> The gcc-common.h header contains frequently included headers for GCC plugins
> and it has a compatibility layer for the supported gcc versions.
>
> The gcc-generate-*-pass.h headers automatically generate the registration
> structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.
>
> Note that 'make clean' keeps the *.so files (only the distclean or mrproper
> targets clean all) because they are needed for out-of-tree modules.
>
> Signed-off-by: Emese Revfy <re.emese@gmail.com>
> ---
>  Documentation/dontdiff                   |   1 +
>  MAINTAINERS                              |   8 +
>  Makefile                                 |  41 +-
>  arch/Kconfig                             |  13 +
>  arch/x86/Kconfig                         |   1 +
>  init/Makefile                            |   3 +
>  scripts/Makefile.build                   |   2 +-
>  scripts/Makefile.clean                   |   3 +-
>  scripts/Makefile.gcc-plugins             |  28 ++
>  scripts/Makefile.host                    |  69 ++-
>  scripts/gcc-plugin.sh                    |  51 ++
>  scripts/link-vmlinux.sh                  |   2 +-
>  scripts/package/builddeb                 |   1 +
>  tools/gcc/Makefile                       |  15 +
>  tools/gcc/gcc-common.h                   | 803 +++++++++++++++++++++++++++++++
>  tools/gcc/gcc-generate-gimple-pass.h     | 173 +++++++
>  tools/gcc/gcc-generate-ipa-pass.h        | 287 +++++++++++
>  tools/gcc/gcc-generate-rtl-pass.h        | 173 +++++++
>  tools/gcc/gcc-generate-simple_ipa-pass.h | 173 +++++++
>  19 files changed, 1832 insertions(+), 15 deletions(-)
>  create mode 100644 scripts/Makefile.gcc-plugins
>  create mode 100644 scripts/gcc-plugin.sh
>  create mode 100644 tools/gcc/Makefile
>  create mode 100644 tools/gcc/gcc-common.h
>  create mode 100644 tools/gcc/gcc-generate-gimple-pass.h
>  create mode 100644 tools/gcc/gcc-generate-ipa-pass.h
>  create mode 100644 tools/gcc/gcc-generate-rtl-pass.h
>  create mode 100644 tools/gcc/gcc-generate-simple_ipa-pass.h
>
> diff --git a/Documentation/dontdiff b/Documentation/dontdiff
> index 8ea834f..5385cba 100644
> --- a/Documentation/dontdiff
> +++ b/Documentation/dontdiff
> @@ -3,6 +3,7 @@
>  *.bc
>  *.bin
>  *.bz2
> +*.c.[012]*.*
>  *.cis
>  *.cpio
>  *.csp
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8b0e00e..409ef04 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4742,6 +4742,14 @@ L:       linux-scsi@vger.kernel.org
>  S:     Odd Fixes (e.g., new signatures)
>  F:     drivers/scsi/fdomain.*
>
> +GCC PLUGINS
> +M:     Kees Cook <keescook@chromium.org>
> +R:     Emese Revfy <re.emese@gmail.com>
> +L:     kernel-hardening@lists.openwall.com
> +S:     Maintained
> +F:     tools/gcc
> +F:     Documentation/gcc-plugins.txt
> +
>  GCOV BASED KERNEL PROFILING
>  M:     Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
>  S:     Maintained
> diff --git a/Makefile b/Makefile
> index f3f70dc..2b65991 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -435,8 +435,8 @@ export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
>  # Rules shared between *config targets and build targets
>
>  # Basic helpers built in scripts/
> -PHONY += scripts_basic
> -scripts_basic:
> +PHONY += scripts_basic gcc-plugins
> +scripts_basic: gcc-plugins
>         $(Q)$(MAKE) $(build)=scripts/basic
>         $(Q)rm -f .tmp_quiet_recordmcount
>
> @@ -623,6 +623,8 @@ endif
>  # Tell gcc to never replace conditional load with a non-conditional one
>  KBUILD_CFLAGS  += $(call cc-option,--param=allow-store-data-races=0)
>
> +include scripts/Makefile.gcc-plugins
> +
>  ifdef CONFIG_READABLE_ASM
>  # Disable optimizations that make assembler listings hard to read.
>  # reorder blocks reorders the control in the function
> @@ -946,6 +948,8 @@ endif
>
>  # The actual objects are generated when descending,
>  # make sure no implicit rule kicks in
> +$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +$(filter-out $(init-y),$(vmlinux-deps)): KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
>
>  # Handle descending into subdirectories listed in $(vmlinux-dirs)
> @@ -955,7 +959,7 @@ $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
>  # Error messages still appears in the original language
>
>  PHONY += $(vmlinux-dirs)
> -$(vmlinux-dirs): prepare scripts
> +$(vmlinux-dirs): gcc-plugins prepare scripts
>         $(Q)$(MAKE) $(build)=$@
>
>  define filechk_kernel.release
> @@ -998,10 +1002,13 @@ prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
>
>  archprepare: archheaders archscripts prepare1 scripts_basic
>
> +prepare0: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +prepare0: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  prepare0: archprepare FORCE
>         $(Q)$(MAKE) $(build)=.
>
>  # All the preparing..
> +prepare: KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS))
>  prepare: prepare0
>
>  # Generate some files
> @@ -1120,6 +1127,8 @@ all: modules
>  # using awk while concatenating to the final file.
>
>  PHONY += modules
> +modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
>         $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
>         @$(kecho) '  Building modules, stage 2.';
> @@ -1135,7 +1144,7 @@ modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
>
>  # Target to prepare building external modules
>  PHONY += modules_prepare
> -modules_prepare: prepare scripts
> +modules_prepare: gcc-plugins prepare scripts
>
>  # Target to install modules
>  PHONY += modules_install
> @@ -1240,7 +1249,7 @@ distclean: mrproper
>         @find $(srctree) $(RCS_FIND_IGNORE) \
>                 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
>                 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
> -               -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
> +               -o -name '.*.rej' -o -name '*.so' -o -name '*%' -o -name 'core' \) \
>                 -type f -print | xargs rm -f
>
>
> @@ -1409,6 +1418,8 @@ PHONY += $(module-dirs) modules
>  $(module-dirs): crmodverdir $(objtree)/Module.symvers
>         $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
>
> +modules: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +modules: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
>  modules: $(module-dirs)
>         @$(kecho) '  Building modules, stage 2.';
>         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
> @@ -1550,17 +1561,21 @@ else
>          target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
>  endif
>
> -%.s: %.c prepare scripts FORCE
> +%.s: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.s: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%.s: %.c gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.i: %.c prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> -%.o: %.c prepare scripts FORCE
> +%.o: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.o: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%.o: %.c gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.lst: %.c prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> -%.s: %.S prepare scripts FORCE
> +%.s: %.S gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> -%.o: %.S prepare scripts FORCE
> +%.o: %.S gcc-plugins prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
>  %.symtypes: %.c prepare scripts FORCE
>         $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
> @@ -1572,11 +1587,15 @@ endif
>         $(build)=$(build-dir)
>  # Make sure the latest headers are built for Documentation
>  Documentation/: headers_install
> -%/: prepare scripts FORCE
> +%/: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%/: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%/: gcc-plugins prepare scripts FORCE
>         $(cmd_crmodverdir)
>         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
>         $(build)=$(build-dir)
> -%.ko: prepare scripts FORCE
> +%.ko: KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> +%.ko: KBUILD_AFLAGS += $(GCC_PLUGINS_AFLAGS)
> +%.ko: gcc-plugins prepare scripts FORCE
>         $(cmd_crmodverdir)
>         $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
>         $(build)=$(build-dir) $(@:.ko=.o)
> diff --git a/arch/Kconfig b/arch/Kconfig
> index 155e6cd..4c54ef0 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -357,6 +357,19 @@ config SECCOMP_FILTER
>
>           See Documentation/prctl/seccomp_filter.txt for details.
>
> +config HAVE_GCC_PLUGINS
> +       bool
> +       help
> +         An arch should select this symbol if it supports building with
> +         GCC plugins.
> +
> +menuconfig GCC_PLUGINS
> +       bool "GCC plugins"
> +       depends on HAVE_GCC_PLUGINS
> +       help
> +         GCC plugins are loadable modules that provide extra features to the
> +         compiler. They are useful for runtime instrumentation and static analysis.
> +
>  config HAVE_CC_STACKPROTECTOR
>         bool
>         help

endmenu is missing?

-Kees

> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index c8e7314..c221fbc 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -157,6 +157,7 @@ config X86
>         select VIRT_TO_BUS
>         select X86_DEV_DMA_OPS                  if X86_64
>         select X86_FEATURE_NAMES                if PROC_FS
> +       select HAVE_GCC_PLUGINS
>         select ARCH_USES_HIGH_VMA_FLAGS         if X86_INTEL_MEMORY_PROTECTION_KEYS
>         select ARCH_HAS_PKEYS                   if X86_INTEL_MEMORY_PROTECTION_KEYS
>
> diff --git a/init/Makefile b/init/Makefile
> index 7bc47ee..6da2dc7 100644
> --- a/init/Makefile
> +++ b/init/Makefile
> @@ -2,6 +2,9 @@
>  # Makefile for the linux kernel.
>  #
>
> +ccflags-y := $(GCC_PLUGINS_CFLAGS)
> +asflags-y := $(GCC_PLUGINS_AFLAGS)
> +
>  obj-y                          := main.o version.o mounts.o
>  ifneq ($(CONFIG_BLK_DEV_INITRD),y)
>  obj-y                          += noinitramfs.o
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 2c47f9c..9d46008 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -60,7 +60,7 @@ endif
>  endif
>
>  # Do not include host rules unless needed
> -ifneq ($(hostprogs-y)$(hostprogs-m),)
> +ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
>  include scripts/Makefile.host
>  endif
>
> diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
> index 55c96cb..e4e88ab 100644
> --- a/scripts/Makefile.clean
> +++ b/scripts/Makefile.clean
> @@ -38,7 +38,8 @@ subdir-ymn    := $(addprefix $(obj)/,$(subdir-ymn))
>  __clean-files  := $(extra-y) $(extra-m) $(extra-)       \
>                    $(always) $(targets) $(clean-files)   \
>                    $(host-progs)                         \
> -                  $(hostprogs-y) $(hostprogs-m) $(hostprogs-)
> +                  $(hostprogs-y) $(hostprogs-m) $(hostprogs-) \
> +                  $(hostlibs-y) $(hostlibs-m) $(hostlibs-)
>
>  __clean-files   := $(filter-out $(no-clean-files), $(__clean-files))
>
> diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
> new file mode 100644
> index 0000000..7c85bf2
> --- /dev/null
> +++ b/scripts/Makefile.gcc-plugins
> @@ -0,0 +1,28 @@
> +ifdef CONFIG_GCC_PLUGINS
> +ifeq ($(call cc-ifversion, -ge, 0408, y), y)
> +PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(HOSTCXX)" "$(HOSTCXX)" "$(CC)")
> +else
> +PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(HOSTCC)" "$(HOSTCXX)" "$(CC)")
> +endif
> +ifneq ($(PLUGINCC),)
> +export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGINS_AFLAGS
> +ifeq ($(KBUILD_EXTMOD),)
> +gcc-plugins:
> +       $(Q)$(MAKE) $(build)=tools/gcc
> +else
> +gcc-plugins: ;
> +endif
> +else
> +gcc-plugins:
> +ifeq ($(call cc-ifversion, -ge, 0405, y), y)
> +       $(warning warning, your gcc installation does not support plugins, perhaps the necessary headers are missing?)
> +ifeq ($(call cc-ifversion, -ge, 0408, y), y)
> +       $(CONFIG_SHELL) -x $(srctree)/scripts/gcc-plugin.sh "$(HOSTCXX)" "$(HOSTCXX)" "$(CC)"
> +else
> +       $(CONFIG_SHELL) -x $(srctree)/scripts/gcc-plugin.sh "$(HOSTCC)" "$(HOSTCXX)" "$(CC)"
> +endif
> +else
> +       $(warning warning, your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least)
> +endif
> +endif
> +endif
> diff --git a/scripts/Makefile.host b/scripts/Makefile.host
> index 133edfa..4d180d9 100644
> --- a/scripts/Makefile.host
> +++ b/scripts/Makefile.host
> @@ -20,7 +20,25 @@
>  # Will compile qconf as a C++ program, and menu as a C program.
>  # They are linked as C++ code to the executable qconf
>
> +# hostprogs-y := conf
> +# conf-objs  := conf.o libkconfig.so
> +# libkconfig-objs := expr.o type.o
> +# Will create a shared library named libkconfig.so that consists of
> +# expr.o and type.o (they are both compiled as C code and the object files
> +# are made as position independent code).
> +# conf.c is compiled as a C program, and conf.o is linked together with
> +# libkconfig.so as the executable conf.
> +# Note: Shared libraries consisting of C++ files are not supported
> +
> +# hostcc-option
> +# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
> +
> +hostcc-option = $(call try-run,\
> +       $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
> +
>  __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
> +__hostlibs := $(sort $(hostlibs-y) $(hostlibs-m))
> +__hostcxxlibs := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
>
>  # C code
>  # Executables compiled from a single .c file
> @@ -42,6 +60,19 @@ host-cxxmulti        := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
>  # C++ Object (.o) files compiled from .cc files
>  host-cxxobjs   := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
>
> +# Shared libaries (only .c supported)
> +# Shared libraries (.so) - all .so files referenced in "xxx-objs"
> +host-cshlib    := $(sort $(filter %.so, $(host-cobjs)))
> +host-cshlib    += $(sort $(filter %.so, $(__hostlibs)))
> +host-cxxshlib  := $(sort $(filter %.so, $(__hostcxxlibs)))
> +# Remove .so files from "xxx-objs"
> +host-cobjs     := $(filter-out %.so,$(host-cobjs))
> +host-cxxobjs   := $(filter-out %.so,$(host-cxxobjs))
> +
> +# Object (.o) files used by the shared libaries
> +host-cshobjs   := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
> +host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
> +
>  # output directory for programs/.o files
>  # hostprogs-y := tools/build may have been specified.
>  # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
> @@ -56,6 +87,10 @@ host-cmulti  := $(addprefix $(obj)/,$(host-cmulti))
>  host-cobjs     := $(addprefix $(obj)/,$(host-cobjs))
>  host-cxxmulti  := $(addprefix $(obj)/,$(host-cxxmulti))
>  host-cxxobjs   := $(addprefix $(obj)/,$(host-cxxobjs))
> +host-cshlib    := $(addprefix $(obj)/,$(host-cshlib))
> +host-cxxshlib  := $(addprefix $(obj)/,$(host-cxxshlib))
> +host-cshobjs   := $(addprefix $(obj)/,$(host-cshobjs))
> +host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
>  host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
>
>  obj-dirs += $(host-objdirs)
> @@ -124,5 +159,37 @@ quiet_cmd_host-cxxobjs     = HOSTCXX $@
>  $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
>         $(call if_changed_dep,host-cxxobjs)
>
> +# Compile .c file, create position independent .o file
> +# host-cshobjs -> .o
> +quiet_cmd_host-cshobjs = HOSTCC  -fPIC $@
> +      cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
> +$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
> +       $(call if_changed_dep,host-cshobjs)
> +
> +# Compile .c file, create position independent .o file
> +# host-cxxshobjs -> .o
> +quiet_cmd_host-cxxshobjs       = HOSTCXX -fPIC $@
> +      cmd_host-cxxshobjs       = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
> +$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
> +       $(call if_changed_dep,host-cxxshobjs)
> +
> +# Link a shared library, based on position independent .o files
> +# *.o -> .so shared library (host-cshlib)
> +quiet_cmd_host-cshlib  = HOSTLLD -shared $@
> +      cmd_host-cshlib  = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
> +                         $(addprefix $(obj)/,$($(@F:.so=-objs))) \
> +                         $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
> +$(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE
> +       $(call if_changed,host-cshlib)
> +
> +# Link a shared library, based on position independent .o files
> +# *.o -> .so shared library (host-cxxshlib)
> +quiet_cmd_host-cxxshlib        = HOSTLLD -shared $@
> +      cmd_host-cxxshlib        = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
> +                         $(addprefix $(obj)/,$($(@F:.so=-objs))) \
> +                         $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
> +$(host-cxxshlib): $(obj)/%: $(host-cxxshobjs) FORCE
> +       $(call if_changed,host-cxxshlib)
> +
>  targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
> -          $(host-cxxmulti) $(host-cxxobjs)
> +          $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
> diff --git a/scripts/gcc-plugin.sh b/scripts/gcc-plugin.sh
> new file mode 100644
> index 0000000..eaa4fce
> --- /dev/null
> +++ b/scripts/gcc-plugin.sh
> @@ -0,0 +1,51 @@
> +#!/bin/sh
> +srctree=$(dirname "$0")
> +gccplugins_dir=$($3 -print-file-name=plugin)
> +plugincc=$($1 -E -x c++ - -o /dev/null -I"${srctree}"/../tools/gcc -I"${gccplugins_dir}"/include 2>&1 <<EOF
> +#include "gcc-common.h"
> +#if BUILDING_GCC_VERSION >= 4008 || defined(ENABLE_BUILD_WITH_CXX)
> +#warning $2 CXX
> +#else
> +#warning $1 CC
> +#endif
> +EOF
> +)
> +
> +if [ $? -ne 0 ]
> +then
> +       exit 1
> +fi
> +
> +case "$plugincc" in
> +       *"$1 CC"*)
> +               echo "$1"
> +               exit 0
> +               ;;
> +
> +       *"$2 CXX"*)
> +               # the c++ compiler needs another test, see below
> +               ;;
> +
> +       *)
> +               exit 1
> +               ;;
> +esac
> +
> +# we need a c++ compiler that supports the designated initializer GNU extension
> +plugincc=$($2 -c -x c++ -std=gnu++98 - -fsyntax-only -I"${srctree}"/../tools/gcc -I"${gccplugins_dir}"/include 2>&1 <<EOF
> +#include "gcc-common.h"
> +class test {
> +public:
> +       int test;
> +} test = {
> +       .test = 1
> +};
> +EOF
> +)
> +
> +if [ $? -eq 0 ]
> +then
> +       echo "$2"
> +       exit 0
> +fi
> +exit 1
> diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
> index 49d61ad..69ee2cf 100755
> --- a/scripts/link-vmlinux.sh
> +++ b/scripts/link-vmlinux.sh
> @@ -184,7 +184,7 @@ else
>  fi;
>
>  # final build of init/
> -${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
> +${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}" GCC_PLUGINS_AFLAGS="${GCC_PLUGINS_AFLAGS}"
>
>  kallsymso=""
>  kallsyms_vmlinux=""
> diff --git a/scripts/package/builddeb b/scripts/package/builddeb
> index 6c3b038..54e0b5e 100755
> --- a/scripts/package/builddeb
> +++ b/scripts/package/builddeb
> @@ -326,6 +326,7 @@ fi
>  (cd $srctree; find arch/$SRCARCH -name module.lds -o -name Kbuild.platforms -o -name Platform) >> "$objtree/debian/hdrsrcfiles"
>  (cd $srctree; find $(find arch/$SRCARCH -name include -o -name scripts -type d) -type f) >> "$objtree/debian/hdrsrcfiles"
>  (cd $objtree; find arch/$SRCARCH/include Module.symvers include scripts -type f) >> "$objtree/debian/hdrobjfiles"
> +(cd $objtree; find tools/gcc -name \*.so -o -name gcc-common.h) >> "$objtree/debian/hdrobjfiles"
>  destdir=$kernel_headers_dir/usr/src/linux-headers-$version
>  mkdir -p "$destdir"
>  (cd $srctree; tar -c -f - -T -) < "$objtree/debian/hdrsrcfiles" | (cd $destdir; tar -xf -)
> diff --git a/tools/gcc/Makefile b/tools/gcc/Makefile
> new file mode 100644
> index 0000000..b2d64af
> --- /dev/null
> +++ b/tools/gcc/Makefile
> @@ -0,0 +1,15 @@
> +GCC_PLUGINS_DIR := $(shell $(CC) -print-file-name=plugin)
> +
> +ifeq ($(PLUGINCC),$(HOSTCC))
> +HOSTLIBS := hostlibs
> +HOST_EXTRACFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu99 -ggdb
> +export HOST_EXTRACFLAGS
> +else
> +HOSTLIBS := hostcxxlibs
> +HOST_EXTRACXXFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu++98 -fno-rtti -fno-exceptions -fasynchronous-unwind-tables -ggdb -Wno-narrowing -Wno-unused-variable
> +export HOST_EXTRACXXFLAGS
> +endif
> +
> +export GCCPLUGINS_DIR HOSTLIBS
> +
> +always := $($(HOSTLIBS)-y)
> diff --git a/tools/gcc/gcc-common.h b/tools/gcc/gcc-common.h
> new file mode 100644
> index 0000000..44a9200
> --- /dev/null
> +++ b/tools/gcc/gcc-common.h
> @@ -0,0 +1,803 @@
> +#ifndef GCC_COMMON_H_INCLUDED
> +#define GCC_COMMON_H_INCLUDED
> +
> +#include "bversion.h"
> +#if BUILDING_GCC_VERSION >= 6000
> +#include "gcc-plugin.h"
> +#else
> +#include "plugin.h"
> +#endif
> +#include "plugin-version.h"
> +#include "config.h"
> +#include "system.h"
> +#include "coretypes.h"
> +#include "tm.h"
> +#include "line-map.h"
> +#include "input.h"
> +#include "tree.h"
> +
> +#include "tree-inline.h"
> +#include "version.h"
> +#include "rtl.h"
> +#include "tm_p.h"
> +#include "flags.h"
> +#include "hard-reg-set.h"
> +#include "output.h"
> +#include "except.h"
> +#include "function.h"
> +#include "toplev.h"
> +#include "basic-block.h"
> +#include "intl.h"
> +#include "ggc.h"
> +#include "timevar.h"
> +
> +#include "params.h"
> +
> +#if BUILDING_GCC_VERSION <= 4009
> +#include "pointer-set.h"
> +#else
> +#include "hash-map.h"
> +#endif
> +
> +#include "emit-rtl.h"
> +#include "debug.h"
> +#include "target.h"
> +#include "langhooks.h"
> +#include "cfgloop.h"
> +#include "cgraph.h"
> +#include "opts.h"
> +
> +#if BUILDING_GCC_VERSION == 4005
> +#include <sys/mman.h>
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4007
> +#include "tree-pretty-print.h"
> +#include "gimple-pretty-print.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4006
> +#include "c-family/c-common.h"
> +#else
> +#include "c-common.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4008
> +#include "tree-flow.h"
> +#else
> +#include "tree-cfgcleanup.h"
> +#include "tree-ssa-operands.h"
> +#include "tree-into-ssa.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4008
> +#include "is-a.h"
> +#endif
> +
> +#include "diagnostic.h"
> +#include "tree-dump.h"
> +#include "tree-pass.h"
> +#include "predict.h"
> +#include "ipa-utils.h"
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +#include "attribs.h"
> +#include "varasm.h"
> +#include "stor-layout.h"
> +#include "internal-fn.h"
> +#include "gimple-expr.h"
> +#include "gimple-fold.h"
> +#include "context.h"
> +#include "tree-ssa-alias.h"
> +#include "tree-ssa.h"
> +#include "stringpool.h"
> +#include "tree-ssanames.h"
> +#include "print-tree.h"
> +#include "tree-eh.h"
> +#include "stmt.h"
> +#include "gimplify.h"
> +#endif
> +
> +#include "gimple.h"
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +#include "tree-ssa-operands.h"
> +#include "tree-phinodes.h"
> +#include "tree-cfg.h"
> +#include "gimple-iterator.h"
> +#include "gimple-ssa.h"
> +#include "ssa-iterators.h"
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 5000
> +#include "builtins.h"
> +#endif
> +
> +/* #include "expr.h" where are you... */
> +extern rtx emit_move_insn(rtx x, rtx y);
> +
> +/* missing from basic_block.h... */
> +extern void debug_dominance_info(enum cdi_direction dir);
> +extern void debug_dominance_tree(enum cdi_direction dir, basic_block root);
> +
> +#if BUILDING_GCC_VERSION == 4006
> +extern void debug_gimple_stmt(gimple);
> +extern void debug_gimple_seq(gimple_seq);
> +extern void print_gimple_seq(FILE *, gimple_seq, int, int);
> +extern void print_gimple_stmt(FILE *, gimple, int, int);
> +extern void print_gimple_expr(FILE *, gimple, int, int);
> +extern void dump_gimple_stmt(pretty_printer *, gimple, int, int);
> +#endif
> +
> +#ifdef __cplusplus
> +static inline void debug_tree(const_tree t)
> +{
> +       debug_tree(CONST_CAST_TREE(t));
> +}
> +
> +static inline void debug_gimple_stmt(const_gimple s)
> +{
> +       debug_gimple_stmt(CONST_CAST_GIMPLE(s));
> +}
> +#else
> +#define debug_tree(t) debug_tree(CONST_CAST_TREE(t))
> +#define debug_gimple_stmt(s) debug_gimple_stmt(CONST_CAST_GIMPLE(s))
> +#endif
> +
> +#define __unused __attribute__((__unused__))
> +
> +#define DECL_NAME_POINTER(node) IDENTIFIER_POINTER(DECL_NAME(node))
> +#define DECL_NAME_LENGTH(node) IDENTIFIER_LENGTH(DECL_NAME(node))
> +#define TYPE_NAME_POINTER(node) IDENTIFIER_POINTER(TYPE_NAME(node))
> +#define TYPE_NAME_LENGTH(node) IDENTIFIER_LENGTH(TYPE_NAME(node))
> +
> +/* should come from c-tree.h if only it were installed for gcc 4.5... */
> +#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1(TYPE)
> +
> +#if BUILDING_GCC_VERSION == 4005
> +#define FOR_EACH_LOCAL_DECL(FUN, I, D)                 \
> +       for (tree vars = (FUN)->local_decls, (I) = 0;   \
> +               vars && ((D) = TREE_VALUE(vars));       \
> +               vars = TREE_CHAIN(vars), (I)++)
> +#define DECL_CHAIN(NODE) (TREE_CHAIN(DECL_MINIMAL_CHECK(NODE)))
> +#define FOR_EACH_VEC_ELT(T, V, I, P) \
> +       for (I = 0; VEC_iterate(T, (V), (I), (P)); ++(I))
> +#define TODO_rebuild_cgraph_edges 0
> +#define SCOPE_FILE_SCOPE_P(EXP) (!(EXP))
> +
> +#ifndef O_BINARY
> +#define O_BINARY 0
> +#endif
> +
> +typedef struct varpool_node *varpool_node_ptr;
> +
> +static inline bool gimple_call_builtin_p(gimple stmt, enum built_in_function code)
> +{
> +       tree fndecl;
> +
> +       if (!is_gimple_call(stmt))
> +               return false;
> +       fndecl = gimple_call_fndecl(stmt);
> +       if (!fndecl || DECL_BUILT_IN_CLASS(fndecl) != BUILT_IN_NORMAL)
> +               return false;
> +       return DECL_FUNCTION_CODE(fndecl) == code;
> +}
> +
> +static inline bool is_simple_builtin(tree decl)
> +{
> +       if (decl && DECL_BUILT_IN_CLASS(decl) != BUILT_IN_NORMAL)
> +               return false;
> +
> +       switch (DECL_FUNCTION_CODE(decl)) {
> +       /* Builtins that expand to constants. */
> +       case BUILT_IN_CONSTANT_P:
> +       case BUILT_IN_EXPECT:
> +       case BUILT_IN_OBJECT_SIZE:
> +       case BUILT_IN_UNREACHABLE:
> +       /* Simple register moves or loads from stack. */
> +       case BUILT_IN_RETURN_ADDRESS:
> +       case BUILT_IN_EXTRACT_RETURN_ADDR:
> +       case BUILT_IN_FROB_RETURN_ADDR:
> +       case BUILT_IN_RETURN:
> +       case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
> +       case BUILT_IN_FRAME_ADDRESS:
> +       case BUILT_IN_VA_END:
> +       case BUILT_IN_STACK_SAVE:
> +       case BUILT_IN_STACK_RESTORE:
> +       /* Exception state returns or moves registers around. */
> +       case BUILT_IN_EH_FILTER:
> +       case BUILT_IN_EH_POINTER:
> +       case BUILT_IN_EH_COPY_VALUES:
> +       return true;
> +
> +       default:
> +       return false;
> +       }
> +}
> +
> +static inline void add_local_decl(struct function *fun, tree d)
> +{
> +       gcc_assert(TREE_CODE(d) == VAR_DECL);
> +       fun->local_decls = tree_cons(NULL_TREE, d, fun->local_decls);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4006
> +#define ANY_RETURN_P(rtx) (GET_CODE(rtx) == RETURN)
> +#define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4(EXP)
> +#define EDGE_PRESERVE 0ULL
> +#define HOST_WIDE_INT_PRINT_HEX_PURE "%" HOST_WIDE_INT_PRINT "x"
> +#define flag_fat_lto_objects true
> +
> +#define get_random_seed(noinit) ({                                             \
> +       unsigned HOST_WIDE_INT seed;                                            \
> +       sscanf(get_random_seed(noinit), "%" HOST_WIDE_INT_PRINT "x", &seed);    \
> +       seed * seed; })
> +
> +#define int_const_binop(code, arg1, arg2)      \
> +       int_const_binop((code), (arg1), (arg2), 0)
> +
> +static inline bool gimple_clobber_p(gimple s __unused)
> +{
> +       return false;
> +}
> +
> +static inline bool gimple_asm_clobbers_memory_p(const_gimple stmt)
> +{
> +       unsigned i;
> +
> +       for (i = 0; i < gimple_asm_nclobbers(stmt); i++) {
> +               tree op = gimple_asm_clobber_op(stmt, i);
> +
> +               if (!strcmp(TREE_STRING_POINTER(TREE_VALUE(op)), "memory"))
> +                       return true;
> +       }
> +
> +       return false;
> +}
> +
> +static inline tree builtin_decl_implicit(enum built_in_function fncode)
> +{
> +       return implicit_built_in_decls[fncode];
> +}
> +
> +static inline int ipa_reverse_postorder(struct cgraph_node **order)
> +{
> +       return cgraph_postorder(order);
> +}
> +
> +static inline struct cgraph_node *cgraph_get_create_node(tree decl)
> +{
> +       struct cgraph_node *node = cgraph_get_node(decl);
> +
> +       return node ? node : cgraph_node(decl);
> +}
> +
> +static inline bool cgraph_function_with_gimple_body_p(struct cgraph_node *node)
> +{
> +       return node->analyzed && !node->thunk.thunk_p && !node->alias;
> +}
> +
> +static inline struct cgraph_node *cgraph_first_function_with_gimple_body(void)
> +{
> +       struct cgraph_node *node;
> +
> +       for (node = cgraph_nodes; node; node = node->next)
> +               if (cgraph_function_with_gimple_body_p(node))
> +                       return node;
> +       return NULL;
> +}
> +
> +static inline struct cgraph_node *cgraph_next_function_with_gimple_body(struct cgraph_node *node)
> +{
> +       for (node = node->next; node; node = node->next)
> +               if (cgraph_function_with_gimple_body_p(node))
> +                       return node;
> +       return NULL;
> +}
> +
> +#define FOR_EACH_FUNCTION_WITH_GIMPLE_BODY(node) \
> +       for ((node) = cgraph_first_function_with_gimple_body(); (node); \
> +               (node) = cgraph_next_function_with_gimple_body(node))
> +
> +static inline void varpool_add_new_variable(tree decl)
> +{
> +       varpool_finalize_decl(decl);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4007
> +#define FOR_EACH_FUNCTION(node)        \
> +       for (node = cgraph_nodes; node; node = node->next)
> +#define FOR_EACH_VARIABLE(node)        \
> +       for (node = varpool_nodes; node; node = node->next)
> +#define PROP_loops 0
> +#define NODE_SYMBOL(node) (node)
> +#define NODE_DECL(node) (node)->decl
> +#define INSN_LOCATION(INSN) RTL_LOCATION(INSN)
> +
> +static inline int bb_loop_depth(const_basic_block bb)
> +{
> +       return bb->loop_father ? loop_depth(bb->loop_father) : 0;
> +}
> +
> +static inline bool gimple_store_p(gimple gs)
> +{
> +       tree lhs = gimple_get_lhs(gs);
> +
> +       return lhs && !is_gimple_reg(lhs);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION == 4007 || BUILDING_GCC_VERSION == 4008
> +static inline struct cgraph_node *cgraph_alias_target(struct cgraph_node *n)
> +{
> +       return cgraph_alias_aliased_node(n);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4007 && BUILDING_GCC_VERSION <= 4009
> +#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
> +       cgraph_create_edge((caller), (callee), (call_stmt), (count), (freq))
> +#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
> +       cgraph_create_edge_including_clones((caller), (callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4008
> +#define ENTRY_BLOCK_PTR_FOR_FN(FN)     ENTRY_BLOCK_PTR_FOR_FUNCTION(FN)
> +#define EXIT_BLOCK_PTR_FOR_FN(FN)      EXIT_BLOCK_PTR_FOR_FUNCTION(FN)
> +#define basic_block_info_for_fn(FN)    ((FN)->cfg->x_basic_block_info)
> +#define n_basic_blocks_for_fn(FN)      ((FN)->cfg->x_n_basic_blocks)
> +#define n_edges_for_fn(FN)             ((FN)->cfg->x_n_edges)
> +#define last_basic_block_for_fn(FN)    ((FN)->cfg->x_last_basic_block)
> +#define label_to_block_map_for_fn(FN)  ((FN)->cfg->x_label_to_block_map)
> +#define profile_status_for_fn(FN)      ((FN)->cfg->x_profile_status)
> +#define BASIC_BLOCK_FOR_FN(FN, N)      BASIC_BLOCK_FOR_FUNCTION((FN), (N))
> +#define NODE_IMPLICIT_ALIAS(node)      (node)->same_body_alias
> +#define VAR_P(NODE)                    (TREE_CODE(NODE) == VAR_DECL)
> +
> +static inline bool tree_fits_shwi_p(const_tree t)
> +{
> +       if (t == NULL_TREE || TREE_CODE(t) != INTEGER_CST)
> +               return false;
> +
> +       if (TREE_INT_CST_HIGH(t) == 0 && (HOST_WIDE_INT)TREE_INT_CST_LOW(t) >= 0)
> +               return true;
> +
> +       if (TREE_INT_CST_HIGH(t) == -1 && (HOST_WIDE_INT)TREE_INT_CST_LOW(t) < 0 && !TYPE_UNSIGNED(TREE_TYPE(t)))
> +               return true;
> +
> +       return false;
> +}
> +
> +static inline bool tree_fits_uhwi_p(const_tree t)
> +{
> +       if (t == NULL_TREE || TREE_CODE(t) != INTEGER_CST)
> +               return false;
> +
> +       return TREE_INT_CST_HIGH(t) == 0;
> +}
> +
> +static inline HOST_WIDE_INT tree_to_shwi(const_tree t)
> +{
> +       gcc_assert(tree_fits_shwi_p(t));
> +       return TREE_INT_CST_LOW(t);
> +}
> +
> +static inline unsigned HOST_WIDE_INT tree_to_uhwi(const_tree t)
> +{
> +       gcc_assert(tree_fits_uhwi_p(t));
> +       return TREE_INT_CST_LOW(t);
> +}
> +
> +static inline const char *get_tree_code_name(enum tree_code code)
> +{
> +       gcc_assert(code < MAX_TREE_CODES);
> +       return tree_code_name[code];
> +}
> +
> +#define ipa_remove_stmt_references(cnode, stmt)
> +
> +typedef union gimple_statement_d gasm;
> +typedef union gimple_statement_d gassign;
> +typedef union gimple_statement_d gcall;
> +typedef union gimple_statement_d gcond;
> +typedef union gimple_statement_d gdebug;
> +typedef union gimple_statement_d gphi;
> +typedef union gimple_statement_d greturn;
> +
> +static inline gasm *as_a_gasm(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gasm *as_a_const_gasm(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gassign *as_a_gassign(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gassign *as_a_const_gassign(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gcall *as_a_gcall(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gcall *as_a_const_gcall(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gcond *as_a_gcond(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gcond *as_a_const_gcond(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gdebug *as_a_gdebug(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gdebug *as_a_const_gdebug(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gphi *as_a_gphi(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gphi *as_a_const_gphi(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline greturn *as_a_greturn(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const greturn *as_a_const_greturn(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION == 4008
> +#define NODE_SYMBOL(node) (&(node)->symbol)
> +#define NODE_DECL(node) (node)->symbol.decl
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4008
> +#define add_referenced_var(var)
> +#define mark_sym_for_renaming(var)
> +#define varpool_mark_needed_node(node)
> +#define create_var_ann(var)
> +#define TODO_dump_func 0
> +#define TODO_dump_cgraph 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION <= 4009
> +#define TODO_verify_il 0
> +#define AVAIL_INTERPOSABLE AVAIL_OVERWRITABLE
> +
> +#define section_name_prefix LTO_SECTION_NAME_PREFIX
> +#define fatal_error(loc, gmsgid, ...) fatal_error((gmsgid), __VA_ARGS__)
> +
> +typedef struct rtx_def rtx_insn;
> +
> +static inline void set_decl_section_name(tree node, const char *value)
> +{
> +       DECL_SECTION_NAME(node) = build_string(strlen(value) + 1, value);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION == 4009
> +typedef struct gimple_statement_asm gasm;
> +typedef struct gimple_statement_base gassign;
> +typedef struct gimple_statement_call gcall;
> +typedef struct gimple_statement_base gcond;
> +typedef struct gimple_statement_base gdebug;
> +typedef struct gimple_statement_phi gphi;
> +typedef struct gimple_statement_base greturn;
> +
> +static inline gasm *as_a_gasm(gimple stmt)
> +{
> +       return as_a<gasm>(stmt);
> +}
> +
> +static inline const gasm *as_a_const_gasm(const_gimple stmt)
> +{
> +       return as_a<const gasm>(stmt);
> +}
> +
> +static inline gassign *as_a_gassign(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gassign *as_a_const_gassign(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gcall *as_a_gcall(gimple stmt)
> +{
> +       return as_a<gcall>(stmt);
> +}
> +
> +static inline const gcall *as_a_const_gcall(const_gimple stmt)
> +{
> +       return as_a<const gcall>(stmt);
> +}
> +
> +static inline gcond *as_a_gcond(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gcond *as_a_const_gcond(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gdebug *as_a_gdebug(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const gdebug *as_a_const_gdebug(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline gphi *as_a_gphi(gimple stmt)
> +{
> +       return as_a<gphi>(stmt);
> +}
> +
> +static inline const gphi *as_a_const_gphi(const_gimple stmt)
> +{
> +       return as_a<const gphi>(stmt);
> +}
> +
> +static inline greturn *as_a_greturn(gimple stmt)
> +{
> +       return stmt;
> +}
> +
> +static inline const greturn *as_a_const_greturn(const_gimple stmt)
> +{
> +       return stmt;
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +#define TODO_ggc_collect 0
> +#define NODE_SYMBOL(node) (node)
> +#define NODE_DECL(node) (node)->decl
> +#define cgraph_node_name(node) (node)->name()
> +#define NODE_IMPLICIT_ALIAS(node) (node)->cpp_implicit_alias
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 5000 && BUILDING_GCC_VERSION < 6000
> +/* gimple related */
> +template <>
> +template <>
> +inline bool is_a_helper<const gassign *>::test(const_gimple gs)
> +{
> +       return gs->code == GIMPLE_ASSIGN;
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 5000
> +#define TODO_verify_ssa TODO_verify_il
> +#define TODO_verify_flow TODO_verify_il
> +#define TODO_verify_stmts TODO_verify_il
> +#define TODO_verify_rtl_sharing TODO_verify_il
> +
> +#define INSN_DELETED_P(insn) (insn)->deleted()
> +
> +/* symtab/cgraph related */
> +#define debug_cgraph_node(node) (node)->debug()
> +#define cgraph_get_node(decl) cgraph_node::get(decl)
> +#define cgraph_get_create_node(decl) cgraph_node::get_create(decl)
> +#define cgraph_n_nodes symtab->cgraph_count
> +#define cgraph_max_uid symtab->cgraph_max_uid
> +#define varpool_get_node(decl) varpool_node::get(decl)
> +
> +#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
> +       (caller)->create_edge((callee), (call_stmt), (count), (freq))
> +#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
> +       (caller)->create_edge_including_clones((callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
> +
> +typedef struct cgraph_node *cgraph_node_ptr;
> +typedef struct cgraph_edge *cgraph_edge_p;
> +typedef struct varpool_node *varpool_node_ptr;
> +
> +static inline void change_decl_assembler_name(tree decl, tree name)
> +{
> +       symtab->change_decl_assembler_name(decl, name);
> +}
> +
> +static inline void varpool_finalize_decl(tree decl)
> +{
> +       varpool_node::finalize_decl(decl);
> +}
> +
> +static inline void varpool_add_new_variable(tree decl)
> +{
> +       varpool_node::add(decl);
> +}
> +
> +static inline unsigned int rebuild_cgraph_edges(void)
> +{
> +       return cgraph_edge::rebuild_edges();
> +}
> +
> +static inline cgraph_node_ptr cgraph_function_node(cgraph_node_ptr node, enum availability *availability)
> +{
> +       return node->function_symbol(availability);
> +}
> +
> +static inline cgraph_node_ptr cgraph_function_or_thunk_node(cgraph_node_ptr node, enum availability *availability = NULL)
> +{
> +       return node->ultimate_alias_target(availability);
> +}
> +
> +static inline bool cgraph_only_called_directly_p(cgraph_node_ptr node)
> +{
> +       return node->only_called_directly_p();
> +}
> +
> +static inline enum availability cgraph_function_body_availability(cgraph_node_ptr node)
> +{
> +       return node->get_availability();
> +}
> +
> +static inline cgraph_node_ptr cgraph_alias_target(cgraph_node_ptr node)
> +{
> +       return node->get_alias_target();
> +}
> +
> +static inline struct cgraph_node_hook_list *cgraph_add_function_insertion_hook(cgraph_node_hook hook, void *data)
> +{
> +       return symtab->add_cgraph_insertion_hook(hook, data);
> +}
> +
> +static inline void cgraph_remove_function_insertion_hook(struct cgraph_node_hook_list *entry)
> +{
> +       symtab->remove_cgraph_insertion_hook(entry);
> +}
> +
> +static inline struct cgraph_node_hook_list *cgraph_add_node_removal_hook(cgraph_node_hook hook, void *data)
> +{
> +       return symtab->add_cgraph_removal_hook(hook, data);
> +}
> +
> +static inline void cgraph_remove_node_removal_hook(struct cgraph_node_hook_list *entry)
> +{
> +       symtab->remove_cgraph_removal_hook(entry);
> +}
> +
> +static inline struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook(cgraph_2node_hook hook, void *data)
> +{
> +       return symtab->add_cgraph_duplication_hook(hook, data);
> +}
> +
> +static inline void cgraph_remove_node_duplication_hook(struct cgraph_2node_hook_list *entry)
> +{
> +       symtab->remove_cgraph_duplication_hook(entry);
> +}
> +
> +#if BUILDING_GCC_VERSION >= 6000
> +typedef gimple *gimple_ptr;
> +typedef const gimple *const_gimple;
> +#define gimple gimple_ptr
> +#endif
> +
> +/* gimple related */
> +static inline gimple gimple_build_assign_with_ops(enum tree_code subcode, tree lhs, tree op1, tree op2 MEM_STAT_DECL)
> +{
> +       return gimple_build_assign(lhs, subcode, op1, op2 PASS_MEM_STAT);
> +}
> +
> +template <>
> +template <>
> +inline bool is_a_helper<const greturn *>::test(const_gimple gs)
> +{
> +       return gs->code == GIMPLE_RETURN;
> +}
> +
> +static inline gasm *as_a_gasm(gimple stmt)
> +{
> +       return as_a<gasm *>(stmt);
> +}
> +
> +static inline const gasm *as_a_const_gasm(const_gimple stmt)
> +{
> +       return as_a<const gasm *>(stmt);
> +}
> +
> +static inline gassign *as_a_gassign(gimple stmt)
> +{
> +       return as_a<gassign *>(stmt);
> +}
> +
> +static inline const gassign *as_a_const_gassign(const_gimple stmt)
> +{
> +       return as_a<const gassign *>(stmt);
> +}
> +
> +static inline gcall *as_a_gcall(gimple stmt)
> +{
> +       return as_a<gcall *>(stmt);
> +}
> +
> +static inline const gcall *as_a_const_gcall(const_gimple stmt)
> +{
> +       return as_a<const gcall *>(stmt);
> +}
> +
> +static inline gphi *as_a_gphi(gimple stmt)
> +{
> +       return as_a<gphi *>(stmt);
> +}
> +
> +static inline const gphi *as_a_const_gphi(const_gimple stmt)
> +{
> +       return as_a<const gphi *>(stmt);
> +}
> +
> +static inline greturn *as_a_greturn(gimple stmt)
> +{
> +       return as_a<greturn *>(stmt);
> +}
> +
> +static inline const greturn *as_a_const_greturn(const_gimple stmt)
> +{
> +       return as_a<const greturn *>(stmt);
> +}
> +
> +/* IPA/LTO related */
> +#define ipa_ref_list_referring_iterate(L, I, P)        \
> +       (L)->referring.iterate((I), &(P))
> +#define ipa_ref_list_reference_iterate(L, I, P)        \
> +       (L)->reference.iterate((I), &(P))
> +
> +static inline cgraph_node_ptr ipa_ref_referring_node(struct ipa_ref *ref)
> +{
> +       return dyn_cast<cgraph_node_ptr>(ref->referring);
> +}
> +
> +static inline void ipa_remove_stmt_references(symtab_node *referring_node, gimple stmt)
> +{
> +       referring_node->remove_stmt_references(stmt);
> +}
> +#endif
> +
> +#if BUILDING_GCC_VERSION < 6000
> +#define get_inner_reference(exp, pbitsize, pbitpos, poffset, pmode, punsignedp, preversep, pvolatilep, keep_aligning)  \
> +       get_inner_reference(exp, pbitsize, pbitpos, poffset, pmode, punsignedp, pvolatilep, keep_aligning)
> +#define gen_rtx_set(ARG0, ARG1) gen_rtx_SET(VOIDmode, (ARG0), (ARG1))
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 6000
> +#define gen_rtx_set(ARG0, ARG1) gen_rtx_SET((ARG0), (ARG1))
> +#endif
> +
> +#endif
> diff --git a/tools/gcc/gcc-generate-gimple-pass.h b/tools/gcc/gcc-generate-gimple-pass.h
> new file mode 100644
> index 0000000..0ba6a0d
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-gimple-pass.h
> @@ -0,0 +1,173 @@
> +/*
> + * Generator for GIMPLE pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct gimple_opt_pass _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = GIMPLE_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       }
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public gimple_opt_pass {
> +public:
> +       _PASS_NAME_PASS() : gimple_opt_pass(_PASS_NAME_PASS_DATA, g) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +
> +#endif /* PASS_NAME */
> diff --git a/tools/gcc/gcc-generate-ipa-pass.h b/tools/gcc/gcc-generate-ipa-pass.h
> new file mode 100644
> index 0000000..283c2e1
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-ipa-pass.h
> @@ -0,0 +1,287 @@
> +/*
> + * Generator for IPA pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GENERATE_SUMMARY
> + *    NO_READ_SUMMARY
> + *    NO_WRITE_SUMMARY
> + *    NO_READ_OPTIMIZATION_SUMMARY
> + *    NO_WRITE_OPTIMIZATION_SUMMARY
> + *    NO_STMT_FIXUP
> + *    NO_FUNCTION_TRANSFORM
> + *    NO_VARIABLE_TRANSFORM
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and *TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GENERATE_SUMMARY
> +#define _GENERATE_SUMMARY NULL
> +#else
> +#define __GENERATE_SUMMARY(n)          _GCC_PLUGIN_CONCAT2(n, _generate_summary)
> +#define _GENERATE_SUMMARY              __GENERATE_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_READ_SUMMARY
> +#define _READ_SUMMARY NULL
> +#else
> +#define __READ_SUMMARY(n)              _GCC_PLUGIN_CONCAT2(n, _read_summary)
> +#define _READ_SUMMARY                  __READ_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_WRITE_SUMMARY
> +#define _WRITE_SUMMARY NULL
> +#else
> +#define __WRITE_SUMMARY(n)             _GCC_PLUGIN_CONCAT2(n, _write_summary)
> +#define _WRITE_SUMMARY                 __WRITE_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_READ_OPTIMIZATION_SUMMARY
> +#define _READ_OPTIMIZATION_SUMMARY NULL
> +#else
> +#define __READ_OPTIMIZATION_SUMMARY(n) _GCC_PLUGIN_CONCAT2(n, _read_optimization_summary)
> +#define _READ_OPTIMIZATION_SUMMARY     __READ_OPTIMIZATION_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_WRITE_OPTIMIZATION_SUMMARY
> +#define _WRITE_OPTIMIZATION_SUMMARY NULL
> +#else
> +#define __WRITE_OPTIMIZATION_SUMMARY(n)        _GCC_PLUGIN_CONCAT2(n, _write_optimization_summary)
> +#define _WRITE_OPTIMIZATION_SUMMARY    __WRITE_OPTIMIZATION_SUMMARY(PASS_NAME)
> +#endif
> +
> +#ifdef NO_STMT_FIXUP
> +#define _STMT_FIXUP NULL
> +#else
> +#define __STMT_FIXUP(n)                        _GCC_PLUGIN_CONCAT2(n, _stmt_fixup)
> +#define _STMT_FIXUP                    __STMT_FIXUP(PASS_NAME)
> +#endif
> +
> +#ifdef NO_FUNCTION_TRANSFORM
> +#define _FUNCTION_TRANSFORM NULL
> +#else
> +#define __FUNCTION_TRANSFORM(n)                _GCC_PLUGIN_CONCAT2(n, _function_transform)
> +#define _FUNCTION_TRANSFORM            __FUNCTION_TRANSFORM(PASS_NAME)
> +#endif
> +
> +#ifdef NO_VARIABLE_TRANSFORM
> +#define _VARIABLE_TRANSFORM NULL
> +#else
> +#define __VARIABLE_TRANSFORM(n)                _GCC_PLUGIN_CONCAT2(n, _variable_transform)
> +#define _VARIABLE_TRANSFORM            __VARIABLE_TRANSFORM(PASS_NAME)
> +#endif
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#ifndef FUNCTION_TRANSFORM_TODO_FLAGS_START
> +#define FUNCTION_TRANSFORM_TODO_FLAGS_START 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct ipa_opt_pass_d _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = IPA_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       },
> +       .generate_summary               = _GENERATE_SUMMARY,
> +       .write_summary                  = _WRITE_SUMMARY,
> +       .read_summary                   = _READ_SUMMARY,
> +#if BUILDING_GCC_VERSION >= 4006
> +       .write_optimization_summary     = _WRITE_OPTIMIZATION_SUMMARY,
> +       .read_optimization_summary      = _READ_OPTIMIZATION_SUMMARY,
> +#endif
> +       .stmt_fixup                     = _STMT_FIXUP,
> +       .function_transform_todo_flags_start    = FUNCTION_TRANSFORM_TODO_FLAGS_START,
> +       .function_transform             = _FUNCTION_TRANSFORM,
> +       .variable_transform             = _VARIABLE_TRANSFORM,
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public ipa_opt_pass_d {
> +public:
> +       _PASS_NAME_PASS() : ipa_opt_pass_d(_PASS_NAME_PASS_DATA,
> +                        g,
> +                        _GENERATE_SUMMARY,
> +                        _WRITE_SUMMARY,
> +                        _READ_SUMMARY,
> +                        _WRITE_OPTIMIZATION_SUMMARY,
> +                        _READ_OPTIMIZATION_SUMMARY,
> +                        _STMT_FIXUP,
> +                        0,
> +                        _FUNCTION_TRANSFORM,
> +                        _VARIABLE_TRANSFORM) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GENERATE_SUMMARY
> +#undef NO_WRITE_SUMMARY
> +#undef NO_READ_SUMMARY
> +#undef NO_WRITE_OPTIMIZATION_SUMMARY
> +#undef NO_READ_OPTIMIZATION_SUMMARY
> +#undef NO_STMT_FIXUP
> +#undef NO_FUNCTION_TRANSFORM
> +#undef NO_VARIABLE_TRANSFORM
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef FUNCTION_TRANSFORM_TODO_FLAGS_START
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _FUNCTION_TRANSFORM
> +#undef __FUNCTION_TRANSFORM
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _GENERATE_SUMMARY
> +#undef __GENERATE_SUMMARY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +#undef _READ_OPTIMIZATION_SUMMARY
> +#undef __READ_OPTIMIZATION_SUMMARY
> +#undef _READ_SUMMARY
> +#undef __READ_SUMMARY
> +#undef _STMT_FIXUP
> +#undef __STMT_FIXUP
> +#undef _VARIABLE_TRANSFORM
> +#undef __VARIABLE_TRANSFORM
> +#undef _WRITE_OPTIMIZATION_SUMMARY
> +#undef __WRITE_OPTIMIZATION_SUMMARY
> +#undef _WRITE_SUMMARY
> +#undef __WRITE_SUMMARY
> +
> +#endif /* PASS_NAME */
> diff --git a/tools/gcc/gcc-generate-rtl-pass.h b/tools/gcc/gcc-generate-rtl-pass.h
> new file mode 100644
> index 0000000..f4cc205
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-rtl-pass.h
> @@ -0,0 +1,173 @@
> +/*
> + * Generator for RTL pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct rtl_opt_pass _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = RTL_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       }
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public rtl_opt_pass {
> +public:
> +       _PASS_NAME_PASS() : rtl_opt_pass(_PASS_NAME_PASS_DATA, g) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +
> +#endif /* PASS_NAME */
> diff --git a/tools/gcc/gcc-generate-simple_ipa-pass.h b/tools/gcc/gcc-generate-simple_ipa-pass.h
> new file mode 100644
> index 0000000..159d5ae
> --- /dev/null
> +++ b/tools/gcc/gcc-generate-simple_ipa-pass.h
> @@ -0,0 +1,173 @@
> +/*
> + * Generator for SIMPLE_IPA pass related boilerplate code/data
> + *
> + * Supports gcc 4.5-6
> + *
> + * Usage:
> + *
> + * 1. before inclusion define PASS_NAME
> + * 2. before inclusion define NO_* for unimplemented callbacks
> + *    NO_GATE
> + *    NO_EXECUTE
> + * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
> + *    the default 0 values
> + * 4. for convenience, all the above will be undefined after inclusion!
> + * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
> + */
> +
> +#ifndef PASS_NAME
> +#error at least PASS_NAME must be defined
> +#else
> +#define __GCC_PLUGIN_STRINGIFY(n)      #n
> +#define _GCC_PLUGIN_STRINGIFY(n)       __GCC_PLUGIN_STRINGIFY(n)
> +#define _GCC_PLUGIN_CONCAT2(x, y)      x ## y
> +#define _GCC_PLUGIN_CONCAT3(x, y, z)   x ## y ## z
> +
> +#define __PASS_NAME_PASS_DATA(n)       _GCC_PLUGIN_CONCAT2(n, _pass_data)
> +#define _PASS_NAME_PASS_DATA           __PASS_NAME_PASS_DATA(PASS_NAME)
> +
> +#define __PASS_NAME_PASS(n)            _GCC_PLUGIN_CONCAT2(n, _pass)
> +#define _PASS_NAME_PASS                        __PASS_NAME_PASS(PASS_NAME)
> +
> +#define _PASS_NAME_NAME                        _GCC_PLUGIN_STRINGIFY(PASS_NAME)
> +
> +#define __MAKE_PASS_NAME_PASS(n)       _GCC_PLUGIN_CONCAT3(make_, n, _pass)
> +#define _MAKE_PASS_NAME_PASS           __MAKE_PASS_NAME_PASS(PASS_NAME)
> +
> +#ifdef NO_GATE
> +#define _GATE NULL
> +#define _HAS_GATE false
> +#else
> +#define __GATE(n)                      _GCC_PLUGIN_CONCAT2(n, _gate)
> +#define _GATE                          __GATE(PASS_NAME)
> +#define _HAS_GATE true
> +#endif
> +
> +#ifdef NO_EXECUTE
> +#define _EXECUTE NULL
> +#define _HAS_EXECUTE false
> +#else
> +#define __EXECUTE(n)                   _GCC_PLUGIN_CONCAT2(n, _execute)
> +#define _EXECUTE                       __EXECUTE(PASS_NAME)
> +#define _HAS_EXECUTE true
> +#endif
> +
> +#ifndef PROPERTIES_REQUIRED
> +#define PROPERTIES_REQUIRED 0
> +#endif
> +
> +#ifndef PROPERTIES_PROVIDED
> +#define PROPERTIES_PROVIDED 0
> +#endif
> +
> +#ifndef PROPERTIES_DESTROYED
> +#define PROPERTIES_DESTROYED 0
> +#endif
> +
> +#ifndef TODO_FLAGS_START
> +#define TODO_FLAGS_START 0
> +#endif
> +
> +#ifndef TODO_FLAGS_FINISH
> +#define TODO_FLAGS_FINISH 0
> +#endif
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +namespace {
> +static const pass_data _PASS_NAME_PASS_DATA = {
> +#else
> +static struct simple_ipa_opt_pass _PASS_NAME_PASS = {
> +       .pass = {
> +#endif
> +               .type                   = SIMPLE_IPA_PASS,
> +               .name                   = _PASS_NAME_NAME,
> +#if BUILDING_GCC_VERSION >= 4008
> +               .optinfo_flags          = OPTGROUP_NONE,
> +#endif
> +#if BUILDING_GCC_VERSION >= 5000
> +#elif BUILDING_GCC_VERSION == 4009
> +               .has_gate               = _HAS_GATE,
> +               .has_execute            = _HAS_EXECUTE,
> +#else
> +               .gate                   = _GATE,
> +               .execute                = _EXECUTE,
> +               .sub                    = NULL,
> +               .next                   = NULL,
> +               .static_pass_number     = 0,
> +#endif
> +               .tv_id                  = TV_NONE,
> +               .properties_required    = PROPERTIES_REQUIRED,
> +               .properties_provided    = PROPERTIES_PROVIDED,
> +               .properties_destroyed   = PROPERTIES_DESTROYED,
> +               .todo_flags_start       = TODO_FLAGS_START,
> +               .todo_flags_finish      = TODO_FLAGS_FINISH,
> +#if BUILDING_GCC_VERSION < 4009
> +       }
> +#endif
> +};
> +
> +#if BUILDING_GCC_VERSION >= 4009
> +class _PASS_NAME_PASS : public simple_ipa_opt_pass {
> +public:
> +       _PASS_NAME_PASS() : simple_ipa_opt_pass(_PASS_NAME_PASS_DATA, g) {}
> +
> +#ifndef NO_GATE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual bool gate(function *) { return _GATE(); }
> +#else
> +       bool gate(void) { return _GATE(); }
> +#endif
> +#endif
> +
> +#ifndef NO_EXECUTE
> +#if BUILDING_GCC_VERSION >= 5000
> +       virtual unsigned int execute(function *) { return _EXECUTE(); }
> +#else
> +       unsigned int execute(void) { return _EXECUTE(); }
> +#endif
> +#endif
> +};
> +}
> +
> +opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return new _PASS_NAME_PASS();
> +}
> +#else
> +struct opt_pass *_MAKE_PASS_NAME_PASS(void)
> +{
> +       return &_PASS_NAME_PASS.pass;
> +}
> +#endif
> +
> +/* clean up user provided defines */
> +#undef PASS_NAME
> +#undef NO_GATE
> +#undef NO_EXECUTE
> +
> +#undef PROPERTIES_DESTROYED
> +#undef PROPERTIES_PROVIDED
> +#undef PROPERTIES_REQUIRED
> +#undef TODO_FLAGS_FINISH
> +#undef TODO_FLAGS_START
> +
> +/* clean up generated defines */
> +#undef _EXECUTE
> +#undef __EXECUTE
> +#undef _GATE
> +#undef __GATE
> +#undef _GCC_PLUGIN_CONCAT2
> +#undef _GCC_PLUGIN_CONCAT3
> +#undef _GCC_PLUGIN_STRINGIFY
> +#undef __GCC_PLUGIN_STRINGIFY
> +#undef _HAS_EXECUTE
> +#undef _HAS_GATE
> +#undef _MAKE_PASS_NAME_PASS
> +#undef __MAKE_PASS_NAME_PASS
> +#undef _PASS_NAME_NAME
> +#undef _PASS_NAME_PASS
> +#undef __PASS_NAME_PASS
> +#undef _PASS_NAME_PASS_DATA
> +#undef __PASS_NAME_PASS_DATA
> +
> +#endif /* PASS_NAME */
> --
> 2.4.1
>

Kees Cook March 1, 2016, 9:34 p.m. UTC | #3

On Tue, Mar 1, 2016 at 1:19 PM, Kees Cook <keescook@chromium.org> wrote:
> On Tue, Mar 1, 2016 at 9:15 AM, Emese Revfy <re.emese@gmail.com> wrote:
>> diff --git a/arch/Kconfig b/arch/Kconfig
>> index 155e6cd..4c54ef0 100644
>> --- a/arch/Kconfig
>> +++ b/arch/Kconfig
>> @@ -357,6 +357,19 @@ config SECCOMP_FILTER
>>
>>           See Documentation/prctl/seccomp_filter.txt for details.
>>
>> +config HAVE_GCC_PLUGINS
>> +       bool
>> +       help
>> +         An arch should select this symbol if it supports building with
>> +         GCC plugins.
>> +
>> +menuconfig GCC_PLUGINS
>> +       bool "GCC plugins"
>> +       depends on HAVE_GCC_PLUGINS
>> +       help
>> +         GCC plugins are loadable modules that provide extra features to the
>> +         compiler. They are useful for runtime instrumentation and static analysis.
>> +
>>  config HAVE_CC_STACKPROTECTOR
>>         bool
>>         help
>
> endmenu is missing?

Sorry, ignore my noise. However, my confusion does point on that maybe
gcc plugin config should live in tools/gcc/Kconfig and be included
here?

-Kees

Kees Cook March 1, 2016, 10:50 p.m. UTC | #4

On Tue, Mar 1, 2016 at 9:15 AM, Emese Revfy <re.emese@gmail.com> wrote:
> This patch allows to build the whole kernel with GCC plugins. It was ported from
> grsecurity/PaX. The infrastructure supports building out-of-tree modules and
> building in a separate directory. Cross-compilation is supported too but
> currently only the x86 architecture enables plugins.

Sorry for the piecemeal review. :) I keep finding little things...

> diff --git a/scripts/Makefile.host b/scripts/Makefile.host
> index 133edfa..4d180d9 100644
> --- a/scripts/Makefile.host
> +++ b/scripts/Makefile.host
> @@ -124,5 +159,37 @@ quiet_cmd_host-cxxobjs     = HOSTCXX $@
>  $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
>         $(call if_changed_dep,host-cxxobjs)
>
> +# Compile .c file, create position independent .o file
> +# host-cshobjs -> .o
> +quiet_cmd_host-cshobjs = HOSTCC  -fPIC $@

Is there a reason to include the -fPIC and -shared (below) in the
"quiet" output?

I think this makes it harder to scan output, and is less "quiet" than
I'd expect:

...
  SYSHDR  arch/x86/entry/syscalls/../../include/generated/uapi/asm/unistd_x32.h
  HOSTCXX -fPIC tools/gcc/format_template.o
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  HOSTLLD -shared tools/gcc/format_template.so
  HOSTCC  arch/x86/tools/relocs_32.o
...

> +      cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
> +$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
> +       $(call if_changed_dep,host-cshobjs)
> +
> +# Compile .c file, create position independent .o file
> +# host-cxxshobjs -> .o
> +quiet_cmd_host-cxxshobjs       = HOSTCXX -fPIC $@
> +      cmd_host-cxxshobjs       = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
> +$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
> +       $(call if_changed_dep,host-cxxshobjs)
> +
> +# Link a shared library, based on position independent .o files
> +# *.o -> .so shared library (host-cshlib)
> +quiet_cmd_host-cshlib  = HOSTLLD -shared $@
> +      cmd_host-cshlib  = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
> +                         $(addprefix $(obj)/,$($(@F:.so=-objs))) \
> +                         $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
> +$(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE
> +       $(call if_changed,host-cshlib)
> +
> +# Link a shared library, based on position independent .o files
> +# *.o -> .so shared library (host-cxxshlib)
> +quiet_cmd_host-cxxshlib        = HOSTLLD -shared $@
> +      cmd_host-cxxshlib        = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
> +                         $(addprefix $(obj)/,$($(@F:.so=-objs))) \
> +                         $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
> +$(host-cxxshlib): $(obj)/%: $(host-cxxshobjs) FORCE
> +       $(call if_changed,host-cxxshlib)
> +
>  targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
> -          $(host-cxxmulti) $(host-cxxobjs)
> +          $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)

-Kees

Emese Revfy March 2, 2016, 8:57 p.m. UTC | #5

On Tue, 1 Mar 2016 11:07:25 -0800
Kees Cook <keescook@chromium.org> wrote:

> I wonder if it might make sense to split the .so-building logic
> changes from the gcc plugin changes to make things more readable for
> review? Personally, I'm fine with this as-is, but it might benefit
> other reviewers, if it's a sane split.

I will split this patch in the next patch set.

> > +GCC PLUGINS
> > +M:     Kees Cook <keescook@chromium.org>
> > +R:     Emese Revfy <re.emese@gmail.com>
> > +L:     kernel-hardening@lists.openwall.com
> > +S:     Maintained
> > +F:     tools/gcc
> 
> I think that needs a trailing slash to indicate it's a tree to match.

I tested it with get_maintainer.pl and it is good.

> > +F:     Documentation/gcc-plugins.txt
> 
> I wonder if this should be moved to Documentation/kbuild/ ?

I don't know. Michal Marek, could you please tell me where I should put the documentation?

Emese Revfy March 2, 2016, 9:18 p.m. UTC | #6

On Tue, 1 Mar 2016 13:34:04 -0800
Kees Cook <keescook@chromium.org> wrote:

> On Tue, Mar 1, 2016 at 1:19 PM, Kees Cook <keescook@chromium.org> wrote:
> > On Tue, Mar 1, 2016 at 9:15 AM, Emese Revfy <re.emese@gmail.com> wrote:
> >> diff --git a/arch/Kconfig b/arch/Kconfig
> >> index 155e6cd..4c54ef0 100644
> >> --- a/arch/Kconfig
> >> +++ b/arch/Kconfig
> >> @@ -357,6 +357,19 @@ config SECCOMP_FILTER
> >>
> >>           See Documentation/prctl/seccomp_filter.txt for details.
> >>
> >> +config HAVE_GCC_PLUGINS
> >> +       bool
> >> +       help
> >> +         An arch should select this symbol if it supports building with
> >> +         GCC plugins.
> >> +
> >> +menuconfig GCC_PLUGINS
> >> +       bool "GCC plugins"
> >> +       depends on HAVE_GCC_PLUGINS
> >> +       help
> >> +         GCC plugins are loadable modules that provide extra features to the
> >> +         compiler. They are useful for runtime instrumentation and static analysis.
> >> +
> >>  config HAVE_CC_STACKPROTECTOR
> >>         bool
> >>         help
> >
> > endmenu is missing?
> 
> Sorry, ignore my noise. However, my confusion does point on that maybe
> gcc plugin config should live in tools/gcc/Kconfig and be included
> here?

I don't know, there is no Kconfig under the tools subdirectory yet.
Michal Marek, could you please tell me how you would like it?

pageexec@freemail.hu March 2, 2016, 9:33 p.m. UTC | #7

On 1 Mar 2016 at 14:50, Kees Cook wrote:

> > @@ -124,5 +159,37 @@ quiet_cmd_host-cxxobjs     = HOSTCXX $@
> >  $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
> >         $(call if_changed_dep,host-cxxobjs)
> >
> > +# Compile .c file, create position independent .o file
> > +# host-cshobjs -> .o
> > +quiet_cmd_host-cshobjs = HOSTCC  -fPIC $@
> 
> Is there a reason to include the -fPIC and -shared (below) in the
> "quiet" output?

this is how it used to be before the entire .so building infrastructure
was nuked from the upstream kernel some time last year IIRC, i only kept
it alive as it was in PaX. i guess the quiet command was more verbose to
make it easier to spot shared objects during make which at the time were
built as dependencies only, not as primary targets (as is the case now
with the gcc plugins). in any case, this is just a visual clue and i don't
particularly care about the color of this bikeshed :).

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[v4,1/3] GCC plugin infrastructure

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