Commit 64afe1d9 authored Feb 25, 2025 by Arnd Bergmann Committed by Wentao Guan Mar 31, 2025

kbuild: hdrcheck: fix cross build with clang

stable inclusion
from stable-v6.6.83
commit 128962f5ab565a8c3251c7a86a31e072ed288f18
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IBXANC

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=128962f5ab565a8c3251c7a86a31e072ed288f18



--------------------------------

[ Upstream commit 02e9a22ceef0227175e391902d8760425fa072c6 ]

The headercheck tries to call clang with a mix of compiler arguments
that don't include the target architecture. When building e.g. x86
headers on arm64, this produces a warning like

   clang: warning: unknown platform, assuming -mfloat-abi=soft

Add in the KBUILD_CPPFLAGS, which contain the target, in order to make it
build properly.

See also 1b71c2fb04e7 ("kbuild: userprogs: fix bitsize and target
detection on clang").

Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Fixes: feb843a4 ("kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 128962f5ab565a8c3251c7a86a31e072ed288f18)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

parent dc3a6472

usr/include/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -10,7 +10,7 @@ UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration

		# In theory, we do not care -m32 or -m64 for header compile tests.
		# It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.
		UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
		UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))

		# USERCFLAGS might contain sysroot location for CC.
		UAPI_CFLAGS += $(USERCFLAGS)