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Wed, 23 Jul 2014 04:58:04 -0700 (PDT) From: =?UTF-8?q?Vin=C3=ADcius=20Tinti?= To: Sam Ravnborg , Michal Marek Cc: Renato Golin , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Vin=C3=ADcius=20Tinti?= , Behan Webster Subject: [PATCH v2] kbuild: add support to generate LLVM bitcode files Date: Wed, 23 Jul 2014 08:56:53 -0300 Message-Id: <1406116613-4514-1-git-send-email-viniciustinti@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: MIME-Version: 1.0 Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Allows kbuild to generate LLVM bitcode files with the .ll extension. # from c code CC=clang make kernel/pid.ll # from asm code CC=clang make arch/x86/kernel/preempt.ll Signed-off-by: Vinícius Tinti Signed-off-by: Behan Webster --- .gitignore | 1 + Makefile | 6 ++++++ scripts/Makefile.build | 14 ++++++++++++++ 3 files changed, 21 insertions(+) diff --git a/.gitignore b/.gitignore index f4c0b09..c5a7656 100644 --- a/.gitignore +++ b/.gitignore @@ -32,6 +32,7 @@ *.lzo *.patch *.gcno +*.ll modules.builtin Module.symvers diff --git a/Makefile b/Makefile index 6b27741..7826c33 100644 --- a/Makefile +++ b/Makefile @@ -1213,6 +1213,8 @@ help: @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' @echo ' dir/ - Build all files in dir and below' @echo ' dir/file.[oisS] - Build specified target only' + @echo ' dir/file.ll - Build the LLVM bitcode file' + @echo ' (requires a compiler support for LLVM bitcode generation)' @echo ' dir/file.lst - Build specified mixed source/assembly target only' @echo ' (requires a recent binutils and recent build (System.map))' @echo ' dir/file.ko - Build module including final link' @@ -1483,6 +1485,10 @@ endif $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.symtypes: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.ll: %.c prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.ll: %.S prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) # Modules /: prepare scripts FORCE diff --git a/scripts/Makefile.build b/scripts/Makefile.build index bf3e677..4d97e4f 100644 --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -174,6 +174,20 @@ cmd_cc_symtypes_c = \ $(obj)/%.symtypes : $(src)/%.c FORCE $(call cmd,cc_symtypes_c) +# LLVM bitcode +# Generate .ll files from .s and .c +quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@ + cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< + +$(obj)/%.ll: $(src)/%.c FORCE + $(call if_changed_dep,cc_ll_c) + +quiet_cmd_as_ll_S = CPP $(quiet_modtag) $@ + cmd_as_ll_S = $(CPP) $(a_flags) -o $@ $< + +$(obj)/%.ll: $(src)/%.S FORCE + $(call if_changed_dep,as_ll_S) + # C (.c) files # The C file is compiled and updated dependency information is generated. # (See cmd_cc_o_c + relevant part of rule_cc_o_c)