Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754507AbdCQAXQ (ORCPT ); Thu, 16 Mar 2017 20:23:16 -0400 Received: from mail-pg0-f43.google.com ([74.125.83.43]:35176 "EHLO mail-pg0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753482AbdCQAXN (ORCPT ); Thu, 16 Mar 2017 20:23:13 -0400 From: Michael Davidson To: Michal Marek , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Herbert Xu , "David S. Miller" , Shaohua Li Cc: Alexander Potapenko , Dmitry Vyukov , Matthias Kaehlcke , x86@kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-raid@vger.kernel.org, Michael Davidson Subject: [PATCH 4/7] x86, boot, LLVM: #undef memcpy etc in string.c Date: Thu, 16 Mar 2017 17:15:17 -0700 Message-Id: <20170317001520.85223-5-md@google.com> X-Mailer: git-send-email 2.12.0.367.g23dc2f6d3c-goog In-Reply-To: <20170317001520.85223-1-md@google.com> References: <20170317001520.85223-1-md@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1073 Lines: 37 undef memcpy and friends in boot/string.c so that the functions defined here will have the correct names, otherwise we end up up trying to redefine __builtin_memcpy etc. Surprisingly, gcc allows this (and, helpfully, discards the __builtin_ prefix from the function name when compiling it), but clang does not. Adding these #undef's appears to preserve what I assume was the original intent of the code. Signed-off-by: Michael Davidson --- arch/x86/boot/string.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/boot/string.c b/arch/x86/boot/string.c index 5457b02fc050..b40266850869 100644 --- a/arch/x86/boot/string.c +++ b/arch/x86/boot/string.c @@ -16,6 +16,15 @@ #include "ctype.h" #include "string.h" +/* + * Undef these macros so that the functions that we provide + * here will have the correct names regardless of how string.h + * may have chosen to #define them. + */ +#undef memcpy +#undef memset +#undef memcmp + int memcmp(const void *s1, const void *s2, size_t len) { bool diff; -- 2.12.0.367.g23dc2f6d3c-goog