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[14.3.142.46]) by smtp.gmail.com with ESMTPSA id 84sm30959306pfy.9.2020.12.25.23.29.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 25 Dec 2020 23:29:35 -0800 (PST) To: x86@kernel.org, linux-kernel@vger.kernel.org Cc: clang-built-linux@googlegroups.com, Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , John Millikin From: John Millikin Subject: [PATCH] arch/x86: Propagate $(CLANG_FLAGS) to $(REALMODE_FLAGS) Message-ID: Date: Sat, 26 Dec 2020 16:29:30 +0900 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When compiling with Clang, the `$(CLANG_FLAGS)' variable contains additional flags needed to cross-compile C and Assembly sources: * `-no-integrated-as' tells clang to assemble with GNU Assembler   instead of its built-in LLVM assembler. This flag is set by default   unless `LLVM_IAS=1' is set, because the LLVM assembler can't yet   parse certain GNU extensions. * `--target' sets the target architecture when cross-compiling. This   flag must be set for both compilation and assembly (`KBUILD_AFLAGS')   to support architecture-specific assembler directives. Signed-off-by: John Millikin ---  arch/x86/Makefile | 5 +++++  1 file changed, 5 insertions(+) diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 7116da3980be..725c65532482 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -33,6 +33,11 @@ REALMODE_CFLAGS += -ffreestanding  REALMODE_CFLAGS += -fno-stack-protector  REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), -Wno-address-of-packed-member)  REALMODE_CFLAGS += $(call __cc-option, $(CC), $(REALMODE_CFLAGS), $(cc_stack_align4)) + +ifdef CONFIG_CC_IS_CLANG +REALMODE_CFLAGS += $(CLANG_FLAGS) +endif +  export REALMODE_CFLAGS    # BITS is used as extension for files which are available in a 32 bit -- 2.29.2