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 <viniciusti...@gmail.com>
Signed-off-by: Behan Webster <beh...@converseincode.com>
---
.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
--
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