4.9-stable review patch. If anyone has any objections, please let me know.
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From: VinÃcius Tinti viniciustinti@gmail.com
commit 433db3e260bc8134d4a46ddf20b3668937e12556 upstream.
Add rules to kbuild in order to generate LLVM assembly files with the .ll extension when using clang.
# from c code make CC=clang kernel/pid.ll
Signed-off-by: VinÃcius Tinti viniciustinti@gmail.com Signed-off-by: Behan Webster behanw@converseincode.com Signed-off-by: Matthias Kaehlcke mka@chromium.org Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com Signed-off-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- .gitignore | 1 + Makefile | 5 +++++ scripts/Makefile.build | 8 ++++++++ 3 files changed, 14 insertions(+)
--- a/.gitignore +++ b/.gitignore @@ -33,6 +33,7 @@ *.lzo *.patch *.gcno +*.ll modules.builtin Module.symvers *.dwo --- a/Makefile +++ b/Makefile @@ -1390,6 +1390,8 @@ help: @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)' @echo ' dir/ - Build all files in dir and below' @echo ' dir/file.[ois] - Build specified target only' + @echo ' dir/file.ll - Build the LLVM assembly file' + @echo ' (requires compiler support for LLVM assembly 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' @@ -1574,6 +1576,7 @@ clean: $(clean-dirs) -o -name '*.symtypes' -o -name 'modules.order' \ -o -name modules.builtin -o -name '.tmp_*.o.*' \ -o -name '*.c.[012]*.*' \ + -o -name '*.ll' \ -o -name '*.gcno' ) -type f -print | xargs rm -f
# Generate tags for editors @@ -1677,6 +1680,8 @@ 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 $@)
# Modules /: prepare scripts FORCE --- a/scripts/Makefile.build +++ b/scripts/Makefile.build @@ -176,6 +176,14 @@ cmd_cc_symtypes_c = $(obj)/%.symtypes : $(src)/%.c FORCE $(call cmd,cc_symtypes_c)
+# LLVM assembly +# Generate .ll files from .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) + # 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)