| Message ID | 20210114185354.308083-1-masahiroy@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] kbuild: check the minimum compiler version in Kconfig | expand |
On Thu, Jan 14, 2021 at 7:54 PM Masahiro Yamada <masahiroy@kernel.org> wrote: > > Paul Gortmaker reported a regression in the GCC version check [1]. > If you use GCC 4.8, the build breaks before showing the error message > "error Sorry, your version of GCC is too old - please use 4.9 or newer." > > I do not want to apply his fix-up since it implies we would not be able > to remove any cc-option test. Anyway, I admit checking the GCC version > in <linux/compiler-gcc.h> is too late. > > Almost at the same time, Linus also suggested to move the compiler > version error to Kconfig time. [2] > > I unified the similar two scripts, gcc-version.sh and clang-version.sh > into the new cc-version.sh. The old scripts invoked the compiler multiple > times (3 times for gcc-version.sh, 4 times for clang-version.sh). I > refactored the code so the new one invokes the compiler just once, and > also tried my best to use shell-builtin commands where possible. > > The new script runs faster. > > $ time ./scripts/clang-version.sh clang > 120000 > > real 0m0.029s > user 0m0.012s > sys 0m0.021s > > $ time ./scripts/cc-version.sh clang > Clang 120000 > > real 0m0.009s > user 0m0.006s > sys 0m0.004s > > The cc-version.sh also shows the error if the compiler is old: > > $ make defconfig CC=clang-9 > *** Default configuration is based on 'x86_64_defconfig' > *** > *** Compiler is too old. > *** Your Clang version: 9.0.1 > *** Minimum Clang version: 10.0.1 > *** > scripts/Kconfig.include:46: Sorry, this compiler is not supported. > make[1]: *** [scripts/kconfig/Makefile:81: defconfig] Error 1 > make: *** [Makefile:602: defconfig] Error 2 > > I removed the clang version check from <linux/compiler-clang.h> > > For now, I did not touch <linux/compiler-gcc.h> in order to avoid > merge conflict with [3], which has been queued up in the arm64 tree. > We can clean it up later. > > The new script takes care of ICC because we have <linux/compiler-intel.h> > although I am not sure if building the kernel with ICC is well-supported. > > [1]: https://lore.kernel.org/r/20210110190807.134996-1-paul.gortmaker@windriver.com > [2]: https://lore.kernel.org/r/CAHk-=wh-+TMHPTFo1qs-MYyK7tZh-OQovA=pP3=e06aCVp6_kA@mail.gmail.com > [3]: https://lore.kernel.org/r/20210112224832.10980-1-will@kernel.org > > Fixes: 87de84c9140e ("kbuild: remove cc-option test of -Werror=date-time") > Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com> > Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> > Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> > Tested-by: Nick Desaulniers <ndesaulniers@google.com> > Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> > Tested-by: Nathan Chancellor <natechancellor@gmail.com> > Reviewed-by: Miguel Ojeda <ojeda@kernel.org> > Tested-by: Miguel Ojeda <ojeda@kernel.org> > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Applied v4 to my custom clang-cfi patchset. Here I tested with all Clang compilers I have installed: [ Debian ] dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-11 Clang 110100 dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-10 Clang 100001 dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-9*** *** Compiler is too old. *** Your Clang version: 9.0.1 *** Minimum Clang version: 10.0.1 *** [ Selfmade LLVM toolchain v11.1.0-rc1 ] dileks@iniza:~/src/linux-kernel/git$ which clang /opt/llvm-toolchain/bin/clang dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang Clang 110100 [ LLVM-12 from <apt.llvm.org> ] dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-12 Clang 120000 Feel free to add my: Tested-by: Sedat Dilek <sedat.dilek@gmail.com> - Sedat - > --- > > Changes in v4: > - use lore version of the links > > Changes in v3: > - add $(srctree)/ to fix out-of-tree build > - support ICC version > > Changes in v2: > - fix the function name > > include/linux/compiler-clang.h | 10 ----- > init/Kconfig | 9 ++-- > scripts/Kconfig.include | 6 +++ > scripts/cc-version.sh | 76 ++++++++++++++++++++++++++++++++++ > scripts/clang-version.sh | 19 --------- > scripts/gcc-version.sh | 20 --------- > 6 files changed, 87 insertions(+), 53 deletions(-) > create mode 100755 scripts/cc-version.sh > delete mode 100755 scripts/clang-version.sh > delete mode 100755 scripts/gcc-version.sh > > diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h > index 98cff1b4b088..04c0a5a717f7 100644 > --- a/include/linux/compiler-clang.h > +++ b/include/linux/compiler-clang.h > @@ -3,16 +3,6 @@ > #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead." > #endif > > -#define CLANG_VERSION (__clang_major__ * 10000 \ > - + __clang_minor__ * 100 \ > - + __clang_patchlevel__) > - > -#if CLANG_VERSION < 100001 > -#ifndef __BPF_TRACING__ > -# error Sorry, your version of Clang is too old - please use 10.0.1 or newer. > -#endif > -#endif > - > /* Compiler specific definitions for Clang compiler */ > > /* same as gcc, this was present in clang-2.6 so we can assume it works > diff --git a/init/Kconfig b/init/Kconfig > index b77c60f8b963..01108dd1318b 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -26,11 +26,11 @@ config CC_VERSION_TEXT > and then every file will be rebuilt. > > config CC_IS_GCC > - def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc) > + def_bool $(success,test $(cc-name) = GCC) > > config GCC_VERSION > int > - default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC > + default $(cc-version) if CC_IS_GCC > default 0 > > config LD_VERSION > @@ -38,14 +38,15 @@ config LD_VERSION > default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh) > > config CC_IS_CLANG > - def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q clang) > + def_bool $(success,test $(cc-name) = Clang) > > config LD_IS_LLD > def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD) > > config CLANG_VERSION > int > - default $(shell,$(srctree)/scripts/clang-version.sh $(CC)) > + default $(cc-version) if CC_IS_CLANG > + default 0 > > config LLD_VERSION > int > diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include > index a5fe72c504ff..0228cb9c74aa 100644 > --- a/scripts/Kconfig.include > +++ b/scripts/Kconfig.include > @@ -39,6 +39,12 @@ as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler > $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found) > $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) > > +# Get the compiler name, version, and error out if it is not supported. > +cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC)) > +$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not supported.) > +cc-name := $(shell,set -- $(cc-info) && echo $1) > +cc-version := $(shell,set -- $(cc-info) && echo $2) > + > # Fail if the linker is gold as it's not capable of linking the kernel proper > $(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported) > > diff --git a/scripts/cc-version.sh b/scripts/cc-version.sh > new file mode 100755 > index 000000000000..818d233bb0ad > --- /dev/null > +++ b/scripts/cc-version.sh > @@ -0,0 +1,76 @@ > +#!/bin/sh > +# SPDX-License-Identifier: GPL-2.0 > +# > +# Print the compiler name and its version in a 5 or 6-digit form. > +# Also, perform the minimum version check. > + > +set -e > + > +# When you raise the compiler version, please update > +# Documentation/process/changes.rst as well. > +gcc_min_version=4.9.0 > +clang_min_version=10.0.1 > +icc_min_version=16.0.3 # temporary > + > +# print the compiler name and versions > +get_compiler_info() > +{ > + cat <<- EOF | "$@" -E -P -x c - 2>/dev/null > + #if defined(__clang__) > + Clang __clang_major__ __clang_minor__ __clang_patchlevel__ > + #elif defined(__INTEL_COMPILER) > + ICC __INTEL_COMPILER __INTEL_COMPILER_UPDATE > + #elif defined(__GNUC__) > + GCC __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__ > + #else > + unknown > + #endif > + EOF > +} > + > +# convert the version string x.y.z to a canonical 5 or 6-digit form > +get_canonical_version() > +{ > + IFS=. > + set -- $1 > + echo $((10000 * $1 + 100 * $2 + $3)) > +} > + > +# $@ instead of $1 because multiple words might be given e.g. CC="ccache gcc" > +orig_args="$@" > +set -- $(get_compiler_info "$@") > + > +name=$1 > + > +case "$name" in > +GCC) > + version=$2.$3.$4 > + min_version=$gcc_min_version > + ;; > +Clang) > + version=$2.$3.$4 > + min_version=$clang_min_version > + ;; > +ICC) > + version=$(($2 / 100)).$(($2 % 100)).$3 > + min_version=$icc_min_version > + ;; > +*) > + echo "$orig_args: unknown compiler" >&2 > + exit 1 > + ;; > +esac > + > +cversion=$(get_canonical_version $version) > +min_cversion=$(get_canonical_version $min_version) > + > +if [ "$cversion" -lt "$min_cversion" ]; then > + echo >&2 "***" > + echo >&2 "*** Compiler is too old." > + echo >&2 "*** Your $name version: $version" > + echo >&2 "*** Minimum $name version: $min_version" > + echo >&2 "***" > + exit 1 > +fi > + > +echo $name $cversion > diff --git a/scripts/clang-version.sh b/scripts/clang-version.sh > deleted file mode 100755 > index 6fabf0695761..000000000000 > --- a/scripts/clang-version.sh > +++ /dev/null > @@ -1,19 +0,0 @@ > -#!/bin/sh > -# SPDX-License-Identifier: GPL-2.0 > -# > -# clang-version clang-command > -# > -# Print the compiler version of `clang-command' in a 5 or 6-digit form > -# such as `50001' for clang-5.0.1 etc. > - > -compiler="$*" > - > -if ! ( $compiler --version | grep -q clang) ; then > - echo 0 > - exit 1 > -fi > - > -MAJOR=$(echo __clang_major__ | $compiler -E -x c - | tail -n 1) > -MINOR=$(echo __clang_minor__ | $compiler -E -x c - | tail -n 1) > -PATCHLEVEL=$(echo __clang_patchlevel__ | $compiler -E -x c - | tail -n 1) > -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL > diff --git a/scripts/gcc-version.sh b/scripts/gcc-version.sh > deleted file mode 100755 > index ae353432539b..000000000000 > --- a/scripts/gcc-version.sh > +++ /dev/null > @@ -1,20 +0,0 @@ > -#!/bin/sh > -# SPDX-License-Identifier: GPL-2.0 > -# > -# gcc-version gcc-command > -# > -# Print the gcc version of `gcc-command' in a 5 or 6-digit form > -# such as `29503' for gcc-2.95.3, `30301' for gcc-3.3.1, etc. > - > -compiler="$*" > - > -if [ ${#compiler} -eq 0 ]; then > - echo "Error: No compiler specified." >&2 > - printf "Usage:\n\t$0 <gcc-command>\n" >&2 > - exit 1 > -fi > - > -MAJOR=$(echo __GNUC__ | $compiler -E -x c - | tail -n 1) > -MINOR=$(echo __GNUC_MINOR__ | $compiler -E -x c - | tail -n 1) > -PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1) > -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL > -- > 2.27.0 > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20210114185354.308083-1-masahiroy%40kernel.org.
On Thu, Jan 14, 2021 at 9:41 PM Sedat Dilek <sedat.dilek@gmail.com> wrote: > > On Thu, Jan 14, 2021 at 7:54 PM Masahiro Yamada <masahiroy@kernel.org> wrote: > > > > Paul Gortmaker reported a regression in the GCC version check [1]. > > If you use GCC 4.8, the build breaks before showing the error message > > "error Sorry, your version of GCC is too old - please use 4.9 or newer." > > > > I do not want to apply his fix-up since it implies we would not be able > > to remove any cc-option test. Anyway, I admit checking the GCC version > > in <linux/compiler-gcc.h> is too late. > > > > Almost at the same time, Linus also suggested to move the compiler > > version error to Kconfig time. [2] > > > > I unified the similar two scripts, gcc-version.sh and clang-version.sh > > into the new cc-version.sh. The old scripts invoked the compiler multiple > > times (3 times for gcc-version.sh, 4 times for clang-version.sh). I > > refactored the code so the new one invokes the compiler just once, and > > also tried my best to use shell-builtin commands where possible. > > > > The new script runs faster. > > > > $ time ./scripts/clang-version.sh clang > > 120000 > > > > real 0m0.029s > > user 0m0.012s > > sys 0m0.021s > > > > $ time ./scripts/cc-version.sh clang > > Clang 120000 > > > > real 0m0.009s > > user 0m0.006s > > sys 0m0.004s > > > > The cc-version.sh also shows the error if the compiler is old: > > > > $ make defconfig CC=clang-9 > > *** Default configuration is based on 'x86_64_defconfig' > > *** > > *** Compiler is too old. > > *** Your Clang version: 9.0.1 > > *** Minimum Clang version: 10.0.1 > > *** > > scripts/Kconfig.include:46: Sorry, this compiler is not supported. > > make[1]: *** [scripts/kconfig/Makefile:81: defconfig] Error 1 > > make: *** [Makefile:602: defconfig] Error 2 > > > > I removed the clang version check from <linux/compiler-clang.h> > > > > For now, I did not touch <linux/compiler-gcc.h> in order to avoid > > merge conflict with [3], which has been queued up in the arm64 tree. > > We can clean it up later. > > > > The new script takes care of ICC because we have <linux/compiler-intel.h> > > although I am not sure if building the kernel with ICC is well-supported. > > > > [1]: https://lore.kernel.org/r/20210110190807.134996-1-paul.gortmaker@windriver.com > > [2]: https://lore.kernel.org/r/CAHk-=wh-+TMHPTFo1qs-MYyK7tZh-OQovA=pP3=e06aCVp6_kA@mail.gmail.com > > [3]: https://lore.kernel.org/r/20210112224832.10980-1-will@kernel.org > > > > Fixes: 87de84c9140e ("kbuild: remove cc-option test of -Werror=date-time") > > Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com> > > Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> > > Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> > > Tested-by: Nick Desaulniers <ndesaulniers@google.com> > > Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> > > Tested-by: Nathan Chancellor <natechancellor@gmail.com> > > Reviewed-by: Miguel Ojeda <ojeda@kernel.org> > > Tested-by: Miguel Ojeda <ojeda@kernel.org> > > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> > > Applied v4 to my custom clang-cfi patchset. > > Here I tested with all Clang compilers I have installed: > > [ Debian ] > > dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-11 > Clang 110100 ^^^ That's from my selfmade toolchain. dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh /usr/bin/clang-11 Clang 110001 - Sedat - > dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-10 > Clang 100001 > dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-9*** > *** Compiler is too old. > *** Your Clang version: 9.0.1 > *** Minimum Clang version: 10.0.1 > *** > > [ Selfmade LLVM toolchain v11.1.0-rc1 ] > > dileks@iniza:~/src/linux-kernel/git$ which clang > /opt/llvm-toolchain/bin/clang > dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang > Clang 110100 > > [ LLVM-12 from <apt.llvm.org> ] > > dileks@iniza:~/src/linux-kernel/git$ scripts/cc-version.sh clang-12 > Clang 120000 > > Feel free to add my: > > Tested-by: Sedat Dilek <sedat.dilek@gmail.com> > > - Sedat - > > > --- > > > > Changes in v4: > > - use lore version of the links > > > > Changes in v3: > > - add $(srctree)/ to fix out-of-tree build > > - support ICC version > > > > Changes in v2: > > - fix the function name > > > > include/linux/compiler-clang.h | 10 ----- > > init/Kconfig | 9 ++-- > > scripts/Kconfig.include | 6 +++ > > scripts/cc-version.sh | 76 ++++++++++++++++++++++++++++++++++ > > scripts/clang-version.sh | 19 --------- > > scripts/gcc-version.sh | 20 --------- > > 6 files changed, 87 insertions(+), 53 deletions(-) > > create mode 100755 scripts/cc-version.sh > > delete mode 100755 scripts/clang-version.sh > > delete mode 100755 scripts/gcc-version.sh > > > > diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h > > index 98cff1b4b088..04c0a5a717f7 100644 > > --- a/include/linux/compiler-clang.h > > +++ b/include/linux/compiler-clang.h > > @@ -3,16 +3,6 @@ > > #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead." > > #endif > > > > -#define CLANG_VERSION (__clang_major__ * 10000 \ > > - + __clang_minor__ * 100 \ > > - + __clang_patchlevel__) > > - > > -#if CLANG_VERSION < 100001 > > -#ifndef __BPF_TRACING__ > > -# error Sorry, your version of Clang is too old - please use 10.0.1 or newer. > > -#endif > > -#endif > > - > > /* Compiler specific definitions for Clang compiler */ > > > > /* same as gcc, this was present in clang-2.6 so we can assume it works > > diff --git a/init/Kconfig b/init/Kconfig > > index b77c60f8b963..01108dd1318b 100644 > > --- a/init/Kconfig > > +++ b/init/Kconfig > > @@ -26,11 +26,11 @@ config CC_VERSION_TEXT > > and then every file will be rebuilt. > > > > config CC_IS_GCC > > - def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc) > > + def_bool $(success,test $(cc-name) = GCC) > > > > config GCC_VERSION > > int > > - default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC > > + default $(cc-version) if CC_IS_GCC > > default 0 > > > > config LD_VERSION > > @@ -38,14 +38,15 @@ config LD_VERSION > > default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh) > > > > config CC_IS_CLANG > > - def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q clang) > > + def_bool $(success,test $(cc-name) = Clang) > > > > config LD_IS_LLD > > def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD) > > > > config CLANG_VERSION > > int > > - default $(shell,$(srctree)/scripts/clang-version.sh $(CC)) > > + default $(cc-version) if CC_IS_CLANG > > + default 0 > > > > config LLD_VERSION > > int > > diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include > > index a5fe72c504ff..0228cb9c74aa 100644 > > --- a/scripts/Kconfig.include > > +++ b/scripts/Kconfig.include > > @@ -39,6 +39,12 @@ as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler > > $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found) > > $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) > > > > +# Get the compiler name, version, and error out if it is not supported. > > +cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC)) > > +$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not supported.) > > +cc-name := $(shell,set -- $(cc-info) && echo $1) > > +cc-version := $(shell,set -- $(cc-info) && echo $2) > > + > > # Fail if the linker is gold as it's not capable of linking the kernel proper > > $(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported) > > > > diff --git a/scripts/cc-version.sh b/scripts/cc-version.sh > > new file mode 100755 > > index 000000000000..818d233bb0ad > > --- /dev/null > > +++ b/scripts/cc-version.sh > > @@ -0,0 +1,76 @@ > > +#!/bin/sh > > +# SPDX-License-Identifier: GPL-2.0 > > +# > > +# Print the compiler name and its version in a 5 or 6-digit form. > > +# Also, perform the minimum version check. > > + > > +set -e > > + > > +# When you raise the compiler version, please update > > +# Documentation/process/changes.rst as well. > > +gcc_min_version=4.9.0 > > +clang_min_version=10.0.1 > > +icc_min_version=16.0.3 # temporary > > + > > +# print the compiler name and versions > > +get_compiler_info() > > +{ > > + cat <<- EOF | "$@" -E -P -x c - 2>/dev/null > > + #if defined(__clang__) > > + Clang __clang_major__ __clang_minor__ __clang_patchlevel__ > > + #elif defined(__INTEL_COMPILER) > > + ICC __INTEL_COMPILER __INTEL_COMPILER_UPDATE > > + #elif defined(__GNUC__) > > + GCC __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__ > > + #else > > + unknown > > + #endif > > + EOF > > +} > > + > > +# convert the version string x.y.z to a canonical 5 or 6-digit form > > +get_canonical_version() > > +{ > > + IFS=. > > + set -- $1 > > + echo $((10000 * $1 + 100 * $2 + $3)) > > +} > > + > > +# $@ instead of $1 because multiple words might be given e.g. CC="ccache gcc" > > +orig_args="$@" > > +set -- $(get_compiler_info "$@") > > + > > +name=$1 > > + > > +case "$name" in > > +GCC) > > + version=$2.$3.$4 > > + min_version=$gcc_min_version > > + ;; > > +Clang) > > + version=$2.$3.$4 > > + min_version=$clang_min_version > > + ;; > > +ICC) > > + version=$(($2 / 100)).$(($2 % 100)).$3 > > + min_version=$icc_min_version > > + ;; > > +*) > > + echo "$orig_args: unknown compiler" >&2 > > + exit 1 > > + ;; > > +esac > > + > > +cversion=$(get_canonical_version $version) > > +min_cversion=$(get_canonical_version $min_version) > > + > > +if [ "$cversion" -lt "$min_cversion" ]; then > > + echo >&2 "***" > > + echo >&2 "*** Compiler is too old." > > + echo >&2 "*** Your $name version: $version" > > + echo >&2 "*** Minimum $name version: $min_version" > > + echo >&2 "***" > > + exit 1 > > +fi > > + > > +echo $name $cversion > > diff --git a/scripts/clang-version.sh b/scripts/clang-version.sh > > deleted file mode 100755 > > index 6fabf0695761..000000000000 > > --- a/scripts/clang-version.sh > > +++ /dev/null > > @@ -1,19 +0,0 @@ > > -#!/bin/sh > > -# SPDX-License-Identifier: GPL-2.0 > > -# > > -# clang-version clang-command > > -# > > -# Print the compiler version of `clang-command' in a 5 or 6-digit form > > -# such as `50001' for clang-5.0.1 etc. > > - > > -compiler="$*" > > - > > -if ! ( $compiler --version | grep -q clang) ; then > > - echo 0 > > - exit 1 > > -fi > > - > > -MAJOR=$(echo __clang_major__ | $compiler -E -x c - | tail -n 1) > > -MINOR=$(echo __clang_minor__ | $compiler -E -x c - | tail -n 1) > > -PATCHLEVEL=$(echo __clang_patchlevel__ | $compiler -E -x c - | tail -n 1) > > -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL > > diff --git a/scripts/gcc-version.sh b/scripts/gcc-version.sh > > deleted file mode 100755 > > index ae353432539b..000000000000 > > --- a/scripts/gcc-version.sh > > +++ /dev/null > > @@ -1,20 +0,0 @@ > > -#!/bin/sh > > -# SPDX-License-Identifier: GPL-2.0 > > -# > > -# gcc-version gcc-command > > -# > > -# Print the gcc version of `gcc-command' in a 5 or 6-digit form > > -# such as `29503' for gcc-2.95.3, `30301' for gcc-3.3.1, etc. > > - > > -compiler="$*" > > - > > -if [ ${#compiler} -eq 0 ]; then > > - echo "Error: No compiler specified." >&2 > > - printf "Usage:\n\t$0 <gcc-command>\n" >&2 > > - exit 1 > > -fi > > - > > -MAJOR=$(echo __GNUC__ | $compiler -E -x c - | tail -n 1) > > -MINOR=$(echo __GNUC_MINOR__ | $compiler -E -x c - | tail -n 1) > > -PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1) > > -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL > > -- > > 2.27.0 > > > > -- > > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com. > > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20210114185354.308083-1-masahiroy%40kernel.org.
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h index 98cff1b4b088..04c0a5a717f7 100644 --- a/include/linux/compiler-clang.h +++ b/include/linux/compiler-clang.h @@ -3,16 +3,6 @@ #error "Please don't include <linux/compiler-clang.h> directly, include <linux/compiler.h> instead." #endif -#define CLANG_VERSION (__clang_major__ * 10000 \ - + __clang_minor__ * 100 \ - + __clang_patchlevel__) - -#if CLANG_VERSION < 100001 -#ifndef __BPF_TRACING__ -# error Sorry, your version of Clang is too old - please use 10.0.1 or newer. -#endif -#endif - /* Compiler specific definitions for Clang compiler */ /* same as gcc, this was present in clang-2.6 so we can assume it works diff --git a/init/Kconfig b/init/Kconfig index b77c60f8b963..01108dd1318b 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -26,11 +26,11 @@ config CC_VERSION_TEXT and then every file will be rebuilt. config CC_IS_GCC - def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q gcc) + def_bool $(success,test $(cc-name) = GCC) config GCC_VERSION int - default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC + default $(cc-version) if CC_IS_GCC default 0 config LD_VERSION @@ -38,14 +38,15 @@ config LD_VERSION default $(shell,$(LD) --version | $(srctree)/scripts/ld-version.sh) config CC_IS_CLANG - def_bool $(success,echo "$(CC_VERSION_TEXT)" | grep -q clang) + def_bool $(success,test $(cc-name) = Clang) config LD_IS_LLD def_bool $(success,$(LD) -v | head -n 1 | grep -q LLD) config CLANG_VERSION int - default $(shell,$(srctree)/scripts/clang-version.sh $(CC)) + default $(cc-version) if CC_IS_CLANG + default 0 config LLD_VERSION int diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include index a5fe72c504ff..0228cb9c74aa 100644 --- a/scripts/Kconfig.include +++ b/scripts/Kconfig.include @@ -39,6 +39,12 @@ as-instr = $(success,printf "%b\n" "$(1)" | $(CC) $(CLANG_FLAGS) -c -x assembler $(error-if,$(failure,command -v $(CC)),compiler '$(CC)' not found) $(error-if,$(failure,command -v $(LD)),linker '$(LD)' not found) +# Get the compiler name, version, and error out if it is not supported. +cc-info := $(shell,$(srctree)/scripts/cc-version.sh $(CC)) +$(error-if,$(success,test -z "$(cc-info)"),Sorry$(comma) this compiler is not supported.) +cc-name := $(shell,set -- $(cc-info) && echo $1) +cc-version := $(shell,set -- $(cc-info) && echo $2) + # Fail if the linker is gold as it's not capable of linking the kernel proper $(error-if,$(success, $(LD) -v | grep -q gold), gold linker '$(LD)' not supported) diff --git a/scripts/cc-version.sh b/scripts/cc-version.sh new file mode 100755 index 000000000000..818d233bb0ad --- /dev/null +++ b/scripts/cc-version.sh @@ -0,0 +1,76 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# +# Print the compiler name and its version in a 5 or 6-digit form. +# Also, perform the minimum version check. + +set -e + +# When you raise the compiler version, please update +# Documentation/process/changes.rst as well. +gcc_min_version=4.9.0 +clang_min_version=10.0.1 +icc_min_version=16.0.3 # temporary + +# print the compiler name and versions +get_compiler_info() +{ + cat <<- EOF | "$@" -E -P -x c - 2>/dev/null + #if defined(__clang__) + Clang __clang_major__ __clang_minor__ __clang_patchlevel__ + #elif defined(__INTEL_COMPILER) + ICC __INTEL_COMPILER __INTEL_COMPILER_UPDATE + #elif defined(__GNUC__) + GCC __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__ + #else + unknown + #endif + EOF +} + +# convert the version string x.y.z to a canonical 5 or 6-digit form +get_canonical_version() +{ + IFS=. + set -- $1 + echo $((10000 * $1 + 100 * $2 + $3)) +} + +# $@ instead of $1 because multiple words might be given e.g. CC="ccache gcc" +orig_args="$@" +set -- $(get_compiler_info "$@") + +name=$1 + +case "$name" in +GCC) + version=$2.$3.$4 + min_version=$gcc_min_version + ;; +Clang) + version=$2.$3.$4 + min_version=$clang_min_version + ;; +ICC) + version=$(($2 / 100)).$(($2 % 100)).$3 + min_version=$icc_min_version + ;; +*) + echo "$orig_args: unknown compiler" >&2 + exit 1 + ;; +esac + +cversion=$(get_canonical_version $version) +min_cversion=$(get_canonical_version $min_version) + +if [ "$cversion" -lt "$min_cversion" ]; then + echo >&2 "***" + echo >&2 "*** Compiler is too old." + echo >&2 "*** Your $name version: $version" + echo >&2 "*** Minimum $name version: $min_version" + echo >&2 "***" + exit 1 +fi + +echo $name $cversion diff --git a/scripts/clang-version.sh b/scripts/clang-version.sh deleted file mode 100755 index 6fabf0695761..000000000000 --- a/scripts/clang-version.sh +++ /dev/null @@ -1,19 +0,0 @@ -#!/bin/sh -# SPDX-License-Identifier: GPL-2.0 -# -# clang-version clang-command -# -# Print the compiler version of `clang-command' in a 5 or 6-digit form -# such as `50001' for clang-5.0.1 etc. - -compiler="$*" - -if ! ( $compiler --version | grep -q clang) ; then - echo 0 - exit 1 -fi - -MAJOR=$(echo __clang_major__ | $compiler -E -x c - | tail -n 1) -MINOR=$(echo __clang_minor__ | $compiler -E -x c - | tail -n 1) -PATCHLEVEL=$(echo __clang_patchlevel__ | $compiler -E -x c - | tail -n 1) -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL diff --git a/scripts/gcc-version.sh b/scripts/gcc-version.sh deleted file mode 100755 index ae353432539b..000000000000 --- a/scripts/gcc-version.sh +++ /dev/null @@ -1,20 +0,0 @@ -#!/bin/sh -# SPDX-License-Identifier: GPL-2.0 -# -# gcc-version gcc-command -# -# Print the gcc version of `gcc-command' in a 5 or 6-digit form -# such as `29503' for gcc-2.95.3, `30301' for gcc-3.3.1, etc. - -compiler="$*" - -if [ ${#compiler} -eq 0 ]; then - echo "Error: No compiler specified." >&2 - printf "Usage:\n\t$0 <gcc-command>\n" >&2 - exit 1 -fi - -MAJOR=$(echo __GNUC__ | $compiler -E -x c - | tail -n 1) -MINOR=$(echo __GNUC_MINOR__ | $compiler -E -x c - | tail -n 1) -PATCHLEVEL=$(echo __GNUC_PATCHLEVEL__ | $compiler -E -x c - | tail -n 1) -printf "%d%02d%02d\\n" $MAJOR $MINOR $PATCHLEVEL
Paul Gortmaker reported a regression in the GCC version check [1]. If you use GCC 4.8, the build breaks before showing the error message "error Sorry, your version of GCC is too old - please use 4.9 or newer." I do not want to apply his fix-up since it implies we would not be able to remove any cc-option test. Anyway, I admit checking the GCC version in <linux/compiler-gcc.h> is too late. Almost at the same time, Linus also suggested to move the compiler version error to Kconfig time. [2] I unified the similar two scripts, gcc-version.sh and clang-version.sh into the new cc-version.sh. The old scripts invoked the compiler multiple times (3 times for gcc-version.sh, 4 times for clang-version.sh). I refactored the code so the new one invokes the compiler just once, and also tried my best to use shell-builtin commands where possible. The new script runs faster. $ time ./scripts/clang-version.sh clang 120000 real 0m0.029s user 0m0.012s sys 0m0.021s $ time ./scripts/cc-version.sh clang Clang 120000 real 0m0.009s user 0m0.006s sys 0m0.004s The cc-version.sh also shows the error if the compiler is old: $ make defconfig CC=clang-9 *** Default configuration is based on 'x86_64_defconfig' *** *** Compiler is too old. *** Your Clang version: 9.0.1 *** Minimum Clang version: 10.0.1 *** scripts/Kconfig.include:46: Sorry, this compiler is not supported. make[1]: *** [scripts/kconfig/Makefile:81: defconfig] Error 1 make: *** [Makefile:602: defconfig] Error 2 I removed the clang version check from <linux/compiler-clang.h> For now, I did not touch <linux/compiler-gcc.h> in order to avoid merge conflict with [3], which has been queued up in the arm64 tree. We can clean it up later. The new script takes care of ICC because we have <linux/compiler-intel.h> although I am not sure if building the kernel with ICC is well-supported. [1]: https://lore.kernel.org/r/20210110190807.134996-1-paul.gortmaker@windriver.com [2]: https://lore.kernel.org/r/CAHk-=wh-+TMHPTFo1qs-MYyK7tZh-OQovA=pP3=e06aCVp6_kA@mail.gmail.com [3]: https://lore.kernel.org/r/20210112224832.10980-1-will@kernel.org Fixes: 87de84c9140e ("kbuild: remove cc-option test of -Werror=date-time") Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com> Tested-by: Nathan Chancellor <natechancellor@gmail.com> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> --- Changes in v4: - use lore version of the links Changes in v3: - add $(srctree)/ to fix out-of-tree build - support ICC version Changes in v2: - fix the function name include/linux/compiler-clang.h | 10 ----- init/Kconfig | 9 ++-- scripts/Kconfig.include | 6 +++ scripts/cc-version.sh | 76 ++++++++++++++++++++++++++++++++++ scripts/clang-version.sh | 19 --------- scripts/gcc-version.sh | 20 --------- 6 files changed, 87 insertions(+), 53 deletions(-) create mode 100755 scripts/cc-version.sh delete mode 100755 scripts/clang-version.sh delete mode 100755 scripts/gcc-version.sh