From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753386Ab2A1NhW (ORCPT ); Sat, 28 Jan 2012 08:37:22 -0500 Received: from mail-pz0-f46.google.com ([209.85.210.46]:53101 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753197Ab2A1NhV (ORCPT ); Sat, 28 Jan 2012 08:37:21 -0500 From: Rabin Vincent To: linux-arm-kernel@lists.infradead.org Cc: Rabin Vincent , Jason Baron , linux-kernel@vger.kernel.org Subject: [PATCHv2 5/6] jump label: detect %c support for ARM Date: Sat, 28 Jan 2012 19:05:24 +0530 Message-Id: <1327757725-10114-6-git-send-email-rabin@rab.in> X-Mailer: git-send-email 1.7.8.3 In-Reply-To: <1327757725-10114-1-git-send-email-rabin@rab.in> References: <1327757725-10114-1-git-send-email-rabin@rab.in> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some versions of ARM GCC which do support asm goto, have problems handling the the %c specifier. Since we need the %c to support jump labels on ARM, detect that too in the asm goto detection script to avoid build errors with these versions. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637 Cc: Jason Baron Cc: linux-kernel@vger.kernel.org Signed-off-by: Rabin Vincent --- scripts/gcc-goto.sh | 18 +++++++++++++++++- 1 files changed, 17 insertions(+), 1 deletions(-) diff --git a/scripts/gcc-goto.sh b/scripts/gcc-goto.sh index 98cffcb..9b744de 100644 --- a/scripts/gcc-goto.sh +++ b/scripts/gcc-goto.sh @@ -2,4 +2,20 @@ # Test for gcc 'asm goto' support # Copyright (C) 2010, Jason Baron -echo "int main(void) { entry: asm goto (\"\"::::entry); return 0; }" | $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y" +cat << "END" | $@ -x c - -c -o /dev/null >/dev/null 2>&1 && echo "y" +int main(void) +{ +#ifdef __arm__ + /* + * Not related to asm goto, but used by jump label + * and broken on some ARM GCC versions (see GCC Bug 48637). + */ + static struct { int dummy; int state; } tp; + asm ("@ %c0" :: "i" (&tp.state)); +#endif + +entry: + asm goto ("" :::: entry); + return 0; +} +END -- 1.7.8.3