From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 822DD1ACEDA; Mon, 23 Jun 2025 21:12:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713155; cv=none; b=Va+77tZ+q6s5ZMrO/vA1DSZbE59o6C5HWe6BuajUraqNdJHkFk/KFV9M4IdB5Cs1+jHhJag3sjTGdDBHG9uUX2pfNR0g1VEgoea9U43GIoIHi2cxE8rEGPGIPNDFryYbCJqyXiiaXS0gXqNuvToLEO8kH3MttrDCZ5vsvMihRZ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750713155; c=relaxed/simple; bh=zHtBULAmpau6XnChW5kVY/zILCaVqOuPyWW12+9nAOo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aTuzFpsu0/9ob1HgH8wgKwfuVLbjgIODgo+YmHX/usPqJ3KAQadRrIChuIHzxPehQFri8GObb8vdtPd295aHdYgDtm7LokEfFIWwgGwhWTcuQLVSZCcRPj4aVbOWiS71jY61Sefl3RdhS34fYTCUsT9ynk56JH8iQZyoAyFqQpo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ImYWsAmB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ImYWsAmB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 194EDC4CEEA; Mon, 23 Jun 2025 21:12:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750713155; bh=zHtBULAmpau6XnChW5kVY/zILCaVqOuPyWW12+9nAOo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ImYWsAmBLgRSmiA9iaPgyN18lSgdpIvpjgJmQuENqnEHoyjzWWXWlO4BnD1n6ZYVK DQBzs2Zm5Nt6iWdTSngfLnQ33s5SPyC20jtUkf2t4WEewLVrxKq/jo+IQLcXH7GCSc 9kxCh+OVbwGHzME6EdwCfdPSC65Oor+fvSxdC+II= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tom Rini , Masahiro Yamada , Nathan Chancellor Subject: [PATCH 5.10 148/355] kbuild: add $(CLANG_FLAGS) to KBUILD_CPPFLAGS Date: Mon, 23 Jun 2025 15:05:49 +0200 Message-ID: <20250623130631.159580975@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130626.716971725@linuxfoundation.org> References: <20250623130626.716971725@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Masahiro Yamada commit feb843a469fb0ab00d2d23cfb9bcc379791011bb upstream. When preprocessing arch/*/kernel/vmlinux.lds.S, the target triple is not passed to $(CPP) because we add it only to KBUILD_{C,A}FLAGS. As a result, the linker script is preprocessed with predefined macros for the build host instead of the target. Assuming you use an x86 build machine, compare the following: $ clang -dM -E -x c /dev/null $ clang -dM -E -x c /dev/null -target aarch64-linux-gnu There is no actual problem presumably because our linker scripts do not rely on such predefined macros, but it is better to define correct ones. Move $(CLANG_FLAGS) to KBUILD_CPPFLAGS, so that all *.c, *.S, *.lds.S will be processed with the proper target triple. [Note] After the patch submission, we got an actual problem that needs this commit. (CBL issue 1859) Link: https://github.com/ClangBuiltLinux/linux/issues/1859 Reported-by: Tom Rini Signed-off-by: Masahiro Yamada Reviewed-by: Nathan Chancellor Tested-by: Nathan Chancellor Signed-off-by: Nathan Chancellor Signed-off-by: Greg Kroah-Hartman --- Makefile | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/Makefile +++ b/Makefile @@ -586,8 +586,7 @@ else CLANG_FLAGS += -fno-integrated-as endif CLANG_FLAGS += -Werror=unknown-warning-option -KBUILD_CFLAGS += $(CLANG_FLAGS) -KBUILD_AFLAGS += $(CLANG_FLAGS) +KBUILD_CPPFLAGS += $(CLANG_FLAGS) export CLANG_FLAGS endif