Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932290AbbDNVdI (ORCPT ); Tue, 14 Apr 2015 17:33:08 -0400 Received: from ozlabs.org ([103.22.144.67]:37752 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932106AbbDNVdD (ORCPT ); Tue, 14 Apr 2015 17:33:03 -0400 Date: Wed, 15 Apr 2015 07:32:59 +1000 From: Anton Blanchard To: Linus Torvalds , Andrew Morton , Alan Modra Cc: linux-kernel@vger.kernel.org Subject: [PATCH] compiler: add support for gcc 6 Message-ID: <20150415073259.72ddfc9c@kryten> X-Mailer: Claws Mail 3.11.1 (GTK+ 2.24.25; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3013 Lines: 84 gcc has recently bumped its major version and this is causing kernel build errors. Create include/linux/compiler-gcc6.h which is a copy of compiler-gcc5.h, minus a few comments that no longer apply. Signed-off-by: Anton Blanchard --- I'm told the versioning scheme in gcc has changed, and to expect much more rev'ing of the major version. We should probably rethink if we need a separate file per major version. diff --git a/include/linux/compiler-gcc6.h b/include/linux/compiler-gcc6.h new file mode 100644 index 0000000..ba064fa --- /dev/null +++ b/include/linux/compiler-gcc6.h @@ -0,0 +1,59 @@ +#ifndef __LINUX_COMPILER_H +#error "Please don't include directly, include instead." +#endif + +#define __used __attribute__((__used__)) +#define __must_check __attribute__((warn_unused_result)) +#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) + +/* Mark functions as cold. gcc will assume any path leading to a call + to them will be unlikely. This means a lot of manual unlikely()s + are unnecessary now for any paths leading to the usual suspects + like BUG(), printk(), panic() etc. [but let's keep them for now for + older compilers] + + gcc also has a __attribute__((__hot__)) to move hot functions into + a special section, but I don't see any sense in this right now in + the kernel context */ +#define __cold __attribute__((__cold__)) + +#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) + +#ifndef __CHECKER__ +# define __compiletime_warning(message) __attribute__((warning(message))) +# define __compiletime_error(message) __attribute__((error(message))) +#endif /* __CHECKER__ */ + +/* + * Mark a position in code as unreachable. This can be used to + * suppress control flow warnings after asm blocks that transfer + * control elsewhere. + */ +#define unreachable() __builtin_unreachable() + +/* Mark a function definition as prohibited from being cloned. */ +#define __noclone __attribute__((__noclone__)) + +/* + * Tell the optimizer that something else uses this function or variable. + */ +#define __visible __attribute__((externally_visible)) + +/* + * GCC 'asm goto' miscompiles certain code sequences: + * + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 + * + * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. + * + * (asm goto is automatically volatile - the naming reflects this.) + */ +#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) + +#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP +#define __HAVE_BUILTIN_BSWAP32__ +#define __HAVE_BUILTIN_BSWAP64__ +#define __HAVE_BUILTIN_BSWAP16__ +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ + +#define KASAN_ABI_VERSION 4 -- 2.1.0 -- 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/