From: Thomas Weißschuh Date: Fri, 27 Feb 2026 06:38:03 +0000 (+0100) Subject: kbuild: uapi: only use dummy-include for headers which use libc X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ef1b7a66b604593c62a6375e4b6afa0a5f2e04a;p=thirdparty%2Fkernel%2Fstable.git kbuild: uapi: only use dummy-include for headers which use libc 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 Reviewed-by: Nathan Chancellor Reviewed-by: Nicolas Schier Tested-by: Nicolas Schier Acked-by: Arnd Bergmann Link: https://patch.msgid.link/20260227-kbuild-uapi-libc-v1-5-c17de0d19776@weissschuh.net Signed-off-by: Nicolas Schier --- diff --git a/usr/include/Makefile b/usr/include/Makefile index a8619aa85c87..fdc79cffcc97 100644 --- a/usr/include/Makefile +++ b/usr/include/Makefile @@ -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 $@