configure.ac: More enhanced check for pthread library.

FreeBSD 12 supports 'pthread_rwlock_tryrdlock' without 'pthread'
library. Let's add check for more rare function.
OTOH, Travis-CI environment supports 'pthread_rwlockattr_destroy',
but does not support 'pthread_rwlock_tryrdlock' without 'pthread'.
So, both checks needed.

Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

diff --git a/configure.ac b/configure.ac
index 3e97a750c812e18ecd14b15edd430ee03ad3b441..71ca9078210ed09adcbf28fbdbc049851bb1c5cb 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -78,6 +78,7 @@ AC_SEARCH_LIBS([pow], [m])
 AC_SEARCH_LIBS([clock_gettime], [rt])
 AC_SEARCH_LIBS([timer_create], [rt])
 AC_SEARCH_LIBS([pthread_rwlock_tryrdlock], [pthread])
+AC_SEARCH_LIBS([pthread_rwlockattr_destroy], [pthread])
 AC_FUNC_STRERROR_R
 
 OVS_CHECK_ESX