From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752332AbaBZBLJ (ORCPT ); Tue, 25 Feb 2014 20:11:09 -0500 Received: from mail-pb0-f52.google.com ([209.85.160.52]:40669 "EHLO mail-pb0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751962AbaBZBJi (ORCPT ); Tue, 25 Feb 2014 20:09:38 -0500 From: behanw@converseincode.com To: mmarek@suse.cz, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org, sparse@chrisli.org Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-sparse@vger.kernel.org, torvalds@linux-foundation.org, dwmw2@infradead.org, pageexec@freemail.hu, Mark Charlebois , Behan Webster Subject: [PATCH 4/5] LLVMLinux: Add support for clang to compiler.h and new compiler-clang.h Date: Tue, 25 Feb 2014 17:08:42 -0800 Message-Id: <1393376923-21892-5-git-send-email-behanw@converseincode.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1393376923-21892-1-git-send-email-behanw@converseincode.com> References: <1393376923-21892-1-git-send-email-behanw@converseincode.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark Charlebois Add a compiler-clang.h file to add specific macros needed for compiling the kernel with clang. Initially the only override required is the macro for silencing the compiler for a purposefully uninintialized variable. Author: Mark Charlebois Signed-off-by: Mark Charlebois Signed-off-by: Behan Webster --- include/linux/compiler-clang.h | 12 ++++++++++++ include/linux/compiler.h | 7 +++++++ 2 files changed, 19 insertions(+) create mode 100644 include/linux/compiler-clang.h diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h new file mode 100644 index 0000000..d1e49d5 --- /dev/null +++ b/include/linux/compiler-clang.h @@ -0,0 +1,12 @@ +#ifndef __LINUX_COMPILER_H +#error "Please don't include directly, include instead." +#endif + +/* Some compiler specific definitions are overwritten here + * for Clang compiler + */ + +#ifdef uninitialized_var +#undef uninitialized_var +#define uninitialized_var(x) x = *(&(x)) +#endif diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 2472740..ee7239e 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -63,6 +63,13 @@ extern void __chk_io_ptr(const volatile void __iomem *); # include #endif +/* Clang compiler defines __GNUC__. So we will overwrite implementations + * coming from above header files here + */ +#ifdef __clang__ +#include +#endif + /* * Generic compiler-dependent macros required for kernel * build go below this comment. Actual compiler/compiler version -- 1.8.3.2