On Wed, Jul 23, 2014 at 8:56 AM, Vinícius Tinti <viniciustinti@xxxxxxxxx> wrote: > 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 <viniciustinti@xxxxxxxxx> > Signed-off-by: Behan Webster <behanw@xxxxxxxxxxxxxxxxxx> > --- > .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) > -- > 2.0.1 > The preempt.s works for me as well the preempt.ll. The make help now displays about the .ll files but I have not found other section in Documentation about it. If there is please let me know. I have also added the *.ll in .gitignore. Regards -- Simplicity is the ultimate sophistication -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
