Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754177AbbFCLqQ (ORCPT ); Wed, 3 Jun 2015 07:46:16 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:56356 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754907AbbFCLoj (ORCPT ); Wed, 3 Jun 2015 07:44:39 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sasha Levin , Linus Torvalds Subject: [PATCH 3.10 06/46] kernel: use the gnu89 standard explicitly Date: Wed, 3 Jun 2015 20:42:44 +0900 Message-Id: <20150603063359.043502685@linuxfoundation.org> X-Mailer: git-send-email 2.4.2 In-Reply-To: <20150603063357.922683803@linuxfoundation.org> References: <20150603063357.922683803@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2626 Lines: 73 3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Kirill A. Shutemov" commit 51b97e354ba9fce1890cf38ecc754aa49677fc89 upstream. Sasha Levin reports: "gcc5 changes the default standard to c11, which makes kernel build unhappy Explicitly define the kernel standard to be gnu89 which should keep everything working exactly like it was before gcc5" There are multiple small issues with the new default, but the biggest issue seems to be that the old - and very useful - GNU extension to allow a cast in front of an initializer has gone away. Patch updated by Kirill: "I'm pretty sure all gcc versions you can build kernel with supports -std=gnu89. cc-option is redunrant. We also need to adjust HOSTCFLAGS otherwise allmodconfig fails for me" Note by Andrew Pinski: "Yes it was reported and both problems relating to this extension has been added to gnu99 and gnu11. Though there are other issues with the kernel dealing with extern inline have different semantics between gnu89 and gnu99/11" End result: we may be able to move up to a newer stdc model eventually, but right now the newer models have some annoying deficiencies, so the traditional "gnu89" model ends up being the preferred one. Signed-off-by: Sasha Levin Singed-off-by: Kirill A. Shutemov Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/Makefile +++ b/Makefile @@ -241,7 +241,7 @@ CONFIG_SHELL := $(shell if [ -x "$$BASH" HOSTCC = gcc HOSTCXX = g++ -HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer +HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89 HOSTCXXFLAGS = -O2 # Decide whether to build built-in, modular, or both. @@ -373,7 +373,9 @@ KBUILD_CFLAGS := -Wall -Wundef -Wstric -fno-strict-aliasing -fno-common \ -Werror-implicit-function-declaration \ -Wno-format-security \ - -fno-delete-null-pointer-checks + -fno-delete-null-pointer-checks \ + -std=gnu89 + KBUILD_AFLAGS_KERNEL := KBUILD_CFLAGS_KERNEL := KBUILD_AFLAGS := -D__ASSEMBLY__ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/