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 BEDB926B087; Thu, 13 Feb 2025 15:32:59 +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=1739460779; cv=none; b=IzVS2VNCruYwCNBh0uarf21BqiWPz+X7QWezd96Ggk0GyDAoSewWb+HXXsAQpzIpmoIzJJ0BRi8yIuibujANg1/yPC1l1SsI2UBzIJc+MI5XrOs5Ai/wTyXSBEBlC2TyDf8gNCwIx704ewkrrCj/tmlLoHnd9PA0cypKHf5PhFs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739460779; c=relaxed/simple; bh=kVZ9V00631yufPYCgwAWGDMoslDn/5XI5DwsZ1MiYLU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=HXVoNbh5ttJ5xCoYijFCNwkNMhoxsuHTCAw+HnZD6LyuXzCbV4Qp3fhgVf39Ung2eBrVU2XDNuSZS1iZ8eRmcFfcEbJcXCvM1mAKx0EW3QaRoZwqHapF3h0C4ckdopWBb4CC23ouVqEgPIEqPUt0LmpQRPW/DwJvH2lJxdm3ASY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=R7lp5Hdw; 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="R7lp5Hdw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D586C4CED1; Thu, 13 Feb 2025 15:32:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739460779; bh=kVZ9V00631yufPYCgwAWGDMoslDn/5XI5DwsZ1MiYLU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=R7lp5Hdwj+qt01oUHSPPYi3jvEWEzvvZE3Jnzl5c9hfIy0EyBhJ2QIkZBYkw/iBFk 2jgUxGpiNjaC0F5VqzcWyvRB/GbheLWyNj53tPj0OYo0Q5bEGKr692pvaK6inYjmOv ns0/f75CLoq1lOKcOnVpDXbwXtTKLzjaiJB0Smeg= 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 6.6 168/273] x86/boot: Use -std=gnu11 to fix build with GCC 15 Date: Thu, 13 Feb 2025 15:29:00 +0100 Message-ID: <20250213142413.970182543@linuxfoundation.org> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250213142407.354217048@linuxfoundation.org> References: <20250213142407.354217048@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-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