From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:48994) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qm0Fm-0008BJ-Hk for qemu-devel@nongnu.org; Wed, 27 Jul 2011 05:18:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Qm0Ff-000831-KN for qemu-devel@nongnu.org; Wed, 27 Jul 2011 05:18:04 -0400 Received: from mtagate1.uk.ibm.com ([194.196.100.161]:43977) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Qm0Ff-0007zS-C6 for qemu-devel@nongnu.org; Wed, 27 Jul 2011 05:18:03 -0400 Received: from d06nrmr1707.portsmouth.uk.ibm.com (d06nrmr1707.portsmouth.uk.ibm.com [9.149.39.225]) by mtagate1.uk.ibm.com (8.13.1/8.13.1) with ESMTP id p6R9HeBJ018298 for ; Wed, 27 Jul 2011 09:17:40 GMT Received: from d06av11.portsmouth.uk.ibm.com (d06av11.portsmouth.uk.ibm.com [9.149.37.252]) by d06nrmr1707.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p6R9Hec71859592 for ; Wed, 27 Jul 2011 10:17:40 +0100 Received: from d06av11.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av11.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p6R9HeK5030522 for ; Wed, 27 Jul 2011 03:17:40 -0600 From: Stefan Hajnoczi Date: Wed, 27 Jul 2011 10:17:26 +0100 Message-Id: <1311758252-10072-2-git-send-email-stefanha@linux.vnet.ibm.com> In-Reply-To: <1311758252-10072-1-git-send-email-stefanha@linux.vnet.ibm.com> References: <1311758252-10072-1-git-send-email-stefanha@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 1/7] vhost build fix for i386 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Anthony Liguori , Wolfgang Mauerer , Stefan Hajnoczi From: Wolfgang Mauerer vhost.c uses __sync_fetch_and_and(), which is only available for -march=i486 and above (see https://bugzilla.redhat.com/show_bug.cgi?id=624279). Signed-off-by: Wolfgang Mauerer Signed-off-by: Stefan Hajnoczi --- configure | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-) diff --git a/configure b/configure index 38e3724..9bfe917 100755 --- a/configure +++ b/configure @@ -2510,6 +2510,29 @@ if test "$trace_backend" = "dtrace"; then fi ########################################## +# __sync_fetch_and_and requires at least -march=i486. Many toolchains +# use i686 as default anyway, but for those that don't, an explicit +# specification is necessary +if test $vhost_net = "yes" && test $cpu = "i386"; then + cat > $TMPC << EOF +int sfaa(unsigned *ptr) +{ + return __sync_fetch_and_and(ptr, 0); +} + +int main(int argc, char **argv) +{ + int val = 42; + sfaa(&val); + return val; +} +EOF + if ! compile_prog "" "" ; then + CFLAGS+="-march=i486" + fi +fi + +########################################## # End of CC checks # After here, no more $cc or $ld runs -- 1.7.5.4