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kbuild: uapi: move some compiler arguments out of the command definition

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Simplify the definition of cmd_hdrtest by moving some of it to a new
variable. This will both enable the upcoming reuse of those flags
and also the extension of cmd_hdrtest.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260316-kbuild-uapi-c-v2-1-35d6d0ed863f@weissschuh.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>
This commit is contained in:
Thomas Weißschuh
2026-03-25 13:24:40 +01:00
committed by Nicolas Schier
parent bb25b5635e
commit 55d68ec5b9
1 changed files with 4 additions and 2 deletions
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usr/include/Makefile
+4 -2
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@@ -140,11 +140,13 @@ always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/
target-libc = $(filter $(uses-libc), $*.h)
target-can-compile = $(filter-out $(no-header-test), $*.h)
hdrtest-flags = -fsyntax-only -Werror \
-nostdinc $(if $(target-libc), -I $(srctree)/usr/dummy-include)
# Include the header twice to detect missing include guard.
quiet_cmd_hdrtest = HDRTEST $<
cmd_hdrtest = \
$(CC) $(c_flags) -fsyntax-only -Werror -x c /dev/null \
-nostdinc $(if $(target-libc), -I $(srctree)/usr/dummy-include) \
$(CC) $(c_flags) $(hdrtest-flags) -x c /dev/null \
$(if $(target-can-compile), -include $< -include $<); \
$(PERL) $(src)/headers_check.pl $(obj) $<; \
touch $@