From: James Page Date: Thu, 5 Dec 2013 17:29:05 +0000 (+0000) Subject: Add check for -latomic X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Fovs.git;a=commitdiff_plain;h=fd2e50cd333324ca18d8186a5c9211aa03c439cf Add check for -latomic Later versions of gcc on some architectures push atomic functions out into a separate atomic library; add a check to see when this is required and add it to LIBS if need be. Specifically the problem was observed on GCC 4.8.2 on powerpc architecture for Ubuntu 14.04: https://launchpadlibrarian.net/155235096/buildlog_ubuntu-trusty-powerpc.openvswitch_2.0.0-0ubuntu1_FAILEDTOBUILD.txt.gz Signed-off-by: James Page Signed-off-by: Ben Pfaff --- diff --git a/configure.ac b/configure.ac index 13d2d31b9..167cc7124 100644 --- a/configure.ac +++ b/configure.ac @@ -83,6 +83,7 @@ OVS_CHECK_XENSERVER_VERSION OVS_CHECK_GROFF OVS_CHECK_GNU_MAKE OVS_CHECK_TLS +OVS_CHECK_ATOMIC_LIBS OVS_CHECK_GCC4_ATOMICS OVS_CHECK_ATOMIC_ALWAYS_LOCK_FREE(1) OVS_CHECK_ATOMIC_ALWAYS_LOCK_FREE(2) diff --git a/m4/openvswitch.m4 b/m4/openvswitch.m4 index 7c3798568..55c48ecc5 100644 --- a/m4/openvswitch.m4 +++ b/m4/openvswitch.m4 @@ -432,6 +432,12 @@ static thread_local int var;], [return var;])], fi fi]) +dnl OVS_CHECK_ATOMIC_LIBS +dnl +dnl Check to see if -latomic is need for GCC atomic built-ins. +AC_DEFUN([OVS_CHECK_ATOMIC_LIBS], + [AC_SEARCH_LIBS([__atomic_load_8], [atomic])]) + dnl OVS_CHECK_GCC4_ATOMICS dnl dnl Checks whether the compiler and linker support GCC 4.0+ atomic built-ins.