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Commit 85ab13ff authored by Vinícius Tinti's avatar Vinícius Tinti Committed by Greg Kroah-Hartman
Browse files

kbuild: Add support to generate LLVM assembly files 



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: default avatarVinícius Tinti <viniciustinti@gmail.com>
Signed-off-by: default avatarBehan Webster <behanw@converseincode.com>
Signed-off-by: default avatarMatthias Kaehlcke <mka@chromium.org>
Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d438cec0

.gitignore

+1 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
*.lzo

*.patch

*.gcno

*.ll

modules.builtin

Module.symvers

*.dwo

Makefile

+5 −0
Original line number Diff line number Diff line
@@ -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

scripts/Makefile.build

+8 −0
Original line number Diff line number Diff line
@@ -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)