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kbuild: add CONFIG_ASM_MODVERSIONS

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Add CONFIG_ASM_MODVERSIONS. This allows to remove one if-conditional
nesting in scripts/Makefile.build.

scripts/Makefile.build is run every time Kbuild descends into a
sub-directory. So, I want to avoid $(wildcard ...) evaluation
where possible although computing $(wildcard ...) is so cheap that
it may not make measurable performance difference.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Masahiro Yamada 2019-08-19 14:54:20 +09:00
commit 2ff2b7ec65
14 changed files with 27 additions and 6 deletions
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7
scripts/Makefile.build
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@ -349,11 +349,7 @@ $(obj)/%.s: $(src)/%.S FORCE
quiet_cmd_as_o_S = AS $(quiet_modtag) $@
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
ifdef CONFIG_MODVERSIONS
ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
ifneq ($(ASM_PROTOTYPES),)
ifdef CONFIG_ASM_MODVERSIONS
# versioning matches the C process described above, with difference that
# we parse asm-prototypes.h C header to get function definitions.
@ -369,7 +365,6 @@ cmd_modversions_S = \
rm -f $(@D)/.tmp_$(@F:.o=.ver); \
fi
endif
endif
$(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
$(call if_changed_rule,as_o_S)