* [PATCH v4] kbuild: Add support to generate LLVM assembly files
@ 2017-04-24 20:04 Matthias Kaehlcke
2017-04-25 21:30 ` Masahiro Yamada
0 siblings, 1 reply; 2+ messages in thread
From: Matthias Kaehlcke @ 2017-04-24 20:04 UTC (permalink / raw)
To: Masahiro Yamada, Michal Marek, Vinícius Tinti, Behan Webster
Cc: linux-kbuild, linux-kernel, Grant Grundler, Greg Hackmann,
Michael Davidson, Matthias Kaehlcke
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
From: Vinícius Tinti <viniciustinti@gmail.com>
Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
Changes in v4:
- changed 'bitcode' to 'assembly'
- removed rule for creating LLVM assembly from machine assembly
- added .ll files to clean rule
- corrected example command in commit message
.gitignore | 1 +
Makefile | 5 +++++
scripts/Makefile.build | 8 ++++++++
3 files changed, 14 insertions(+)
diff --git a/.gitignore b/.gitignore
index c2ed4ecb0acd..0c39aa20b6ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,6 +33,7 @@
*.lzo
*.patch
*.gcno
+*.ll
modules.builtin
Module.symvers
*.dwo
diff --git a/Makefile b/Makefile
index e11989d36c87..1cf775d7c510 100644
--- a/Makefile
+++ b/Makefile
@@ -1361,6 +1361,8 @@ 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'
@@ -1545,6 +1547,7 @@ 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
@@ -1648,6 +1651,8 @@ 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
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index d883116ebaa4..e5f1425c601f 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -177,6 +177,14 @@ 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)
--
2.12.2.816.g2cccc81164-goog
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v4] kbuild: Add support to generate LLVM assembly files
2017-04-24 20:04 [PATCH v4] kbuild: Add support to generate LLVM assembly files Matthias Kaehlcke
@ 2017-04-25 21:30 ` Masahiro Yamada
0 siblings, 0 replies; 2+ messages in thread
From: Masahiro Yamada @ 2017-04-25 21:30 UTC (permalink / raw)
To: Matthias Kaehlcke
Cc: Michal Marek, Vinícius Tinti, Behan Webster,
Linux Kbuild mailing list, Linux Kernel Mailing List,
Grant Grundler, Greg Hackmann, Michael Davidson
2017-04-25 5:04 GMT+09:00 Matthias Kaehlcke <mka@chromium.org>:
> 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
>
> From: Vinícius Tinti <viniciustinti@gmail.com>
> Signed-off-by: Vinícius Tinti <viniciustinti@gmail.com>
> Signed-off-by: Behan Webster <behanw@converseincode.com>
> Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
> ---
> Changes in v4:
> - changed 'bitcode' to 'assembly'
> - removed rule for creating LLVM assembly from machine assembly
> - added .ll files to clean rule
> - corrected example command in commit message
Applied to linux-kbuild/kbuild. Thanks!
--
Best Regards
Masahiro Yamada
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