Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
+2
-1
+2
-1
usr/include/Makefile
+2
-1
usr/include/Makefile
···
93
93
94
94
extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
95
95
96
+
# Include the header to detect missing include guard.
96
97
quiet_cmd_hdrtest = HDRTEST $<
97
98
cmd_hdrtest = \
98
99
$(CC) $(c_flags) -S -o /dev/null -x c /dev/null \
99
-
$(if $(filter-out $(header-test-), $*.h), -include $<); \
100
+
$(if $(filter-out $(header-test-), $*.h), -include $< -include $<); \
100
101
$(PERL) $(srctree)/scripts/headers_check.pl $(obj) $(SRCARCH) $<; \
101
102
touch $@
102
103