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 2E3321DFE34; Wed, 19 Feb 2025 09:24:23 +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=1739957064; cv=none; b=L0gcHN6XFWvz1PvoRQQWvIAGihAS9gchpiCjoVeCbf5kIRM83hJrgtalSCsolJjSiOuYxYs26OycpzBEBRW0CQme2q0dhXK3QKrYmebLuj29XvVvdyB+KVzmHMxyLHe5MdrrFxr/IsIBmX8HKXiUScf06x5hVLKeco+cORjpoCI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739957064; c=relaxed/simple; bh=6FQB/nrklImaU8CCuPjFoEps4jPhk1md5xDoqqg2mbg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Spwlx3fvis9GY4/peuFhdC0a6NKZ35FjzRk1dwrsRKmJ676dikYr98a0GpHdWmi3unuaT8fqgYyTQ0EsF487MI3zAj+YSC7wz4tEKLSkPIHor01EF/OcGEALU5EX+L2zGPjtVjWEzoFZvIZdMZHRdfPvsXHL+ErAAIAZnVAjVYc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=liXwBUfX; 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="liXwBUfX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 54BC4C4CED1; Wed, 19 Feb 2025 09:24:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739957063; bh=6FQB/nrklImaU8CCuPjFoEps4jPhk1md5xDoqqg2mbg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=liXwBUfXwW1jq028m0U+vPTSbwKO5iPJWGiOSMRvUR9IIYDxU7o6hNGV4HBWGXX0M Q7aOuyfqMszULaeZXbU3p9bbK/ipjgNVCoCEXTKYz4g7pV5Cz7IPTQ/GFV9wOPtsYn 0iUvzN+QdsMosE3DTaUdnrZOwoIqM50Frah8pVgc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Kostadin Shishmanov , Jakub Jelinek , Nathan Chancellor , Dave Hansen , Ard Biesheuvel Subject: [PATCH 6.1 396/578] x86/boot: Use -std=gnu11 to fix build with GCC 15 Date: Wed, 19 Feb 2025 09:26:40 +0100 Message-ID: <20250219082708.601972986@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250219082652.891560343@linuxfoundation.org> References: <20250219082652.891560343@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nathan Chancellor commit ee2ab467bddfb2d7f68d996dbab94d7b88f8eaf7 upstream. GCC 15 changed the default C standard version to C23, which should not have impacted the kernel because it requests the gnu11 standard via '-std=' in the main Makefile. However, the x86 compressed boot Makefile uses its own set of KBUILD_CFLAGS without a '-std=' value (i.e., using the default), resulting in errors from the kernel's definitions of bool, true, and false in stddef.h, which are reserved keywords under C23. ./include/linux/stddef.h:11:9: error: expected identifier before ‘false’ 11 | false = 0, ./include/linux/types.h:35:33: error: two or more data types in declaration specifiers 35 | typedef _Bool bool; Set '-std=gnu11' in the x86 compressed boot Makefile to resolve the error and consistently use the same C standard version for the entire kernel. Closes: https://lore.kernel.org/4OAhbllK7x4QJGpZjkYjtBYNLd_2whHx9oFiuZcGwtVR4hIzvduultkgfAIRZI3vQpZylu7Gl929HaYFRGeMEalWCpeMzCIIhLxxRhq4U-Y=@protonmail.com/ Closes: https://lore.kernel.org/Z4467umXR2PZ0M1H@tucnak/ Reported-by: Kostadin Shishmanov Reported-by: Jakub Jelinek Signed-off-by: Nathan Chancellor Signed-off-by: Dave Hansen Reviewed-by: Ard Biesheuvel Cc:stable@vger.kernel.org Link: https://lore.kernel.org/all/20250121-x86-use-std-consistently-gcc-15-v1-1-8ab0acf645cb%40kernel.org Signed-off-by: Greg Kroah-Hartman --- arch/x86/boot/compressed/Makefile | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/boot/compressed/Makefile +++ b/arch/x86/boot/compressed/Makefile @@ -34,6 +34,7 @@ targets := vmlinux vmlinux.bin vmlinux.b # avoid errors with '-march=i386', and future flags may depend on the target to # be valid. KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS) +KBUILD_CFLAGS += -std=gnu11 KBUILD_CFLAGS += -fno-strict-aliasing -fPIE KBUILD_CFLAGS += -Wundef KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING