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kbuild: uapi: only use dummy-include for headers which use libc

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The headers which do not rely on libc are using built using -nostdinc.
For them the dummy headers are pointless.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Tested-by: Nicolas Schier <nsc@kernel.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://patch.msgid.link/20260227-kbuild-uapi-libc-v1-5-c17de0d19776@weissschuh.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>
This commit is contained in:
Thomas Weißschuh
2026-02-27 07:38:03 +01:00
committed by Nicolas Schier
parent 60a16beedf
commit 0ef1b7a66b
1 changed files with 2 additions and 2 deletions
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4
usr/include/Makefile
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@@ -8,7 +8,7 @@
# We cannot go as far as adding -Wpedantic since it emits too many warnings.
UAPI_CFLAGS := -std=c90 -Werror=implicit-function-declaration
override c_flags = $(KBUILD_USERCFLAGS) $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-include
override c_flags = $(KBUILD_USERCFLAGS) $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj)
# The following are excluded for now because they fail to build.
#
@@ -145,7 +145,7 @@ target-can-compile = $(and $(filter-out $(no-header-test), $*.h), \
quiet_cmd_hdrtest = HDRTEST $<
cmd_hdrtest = \
$(CC) $(c_flags) -fsyntax-only -Werror -x c /dev/null \
$(if $(target-no-libc), -nostdinc) \
$(if $(target-no-libc), -nostdinc, -I $(srctree)/usr/dummy-include) \
$(if $(target-can-compile), -include $< -include $<); \
$(PERL) $(src)/headers_check.pl $(obj) $<; \
touch $@