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kbuild: detect missing include guard for exported headers 

Adding an include guard to every header file is good practice in case
it is included multiple times.

Exported headers are compile-tested for the comprehensive sanity checks.
Let's include the same header twice. If an include guard is missing,
the header will fail to build due to redefinition of something.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Masahiro Yamada 2019-12-19 00:34:21 +09:00
parent c79f46a282
commit 551197864a
1 changed files with 2 additions and 1 deletions
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3
usr/include/Makefile
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@ -93,10 +93,11 @@ header-test- += asm-generic/%
extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
# Include the header to detect missing include guard.
quiet_cmd_hdrtest = HDRTEST $<
cmd_hdrtest = \
$(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
$(if $(filter-out $(header-test-), $*.h), -include $<); \
$(if $(filter-out $(header-test-), $*.h), -include $< -include $<); \
$(PERL) $(srctree)/scripts/headers_check.pl $(obj) $(SRCARCH) $<; \
touch $@