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[ Upstream commit02e9a22cee] 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 also1b71c2fb04("kbuild: userprogs: fix bitsize and target detection on clang"). Reviewed-by: Nathan Chancellor <nathan@kernel.org> Fixes:feb843a469("kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Sasha Levin <sashal@kernel.org>