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.
Signed-off-by: James Page <james.p...@ubuntu.com>
---
configure.ac | 1 +
m4/openvswitch.m4 | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/configure.ac b/configure.ac
index 13d2d31..167cc71 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 7c37985..86bd254 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], [ATOMIC_LIBS=-latomic])])
+
dnl OVS_CHECK_GCC4_ATOMICS
dnl
dnl Checks whether the compiler and linker support GCC 4.0+ atomic built-ins.
--
1.8.4.4
_______________________________________________
dev mailing list
dev@openvswitch.org
http://openvswitch.org/mailman/listinfo/dev
