Work around OS X webscalesql issue

Summary: This is fairly ugly, and can hopefully get fixed in
webscalesql, but until then makes mysql and mysqli work on OS X.
Upstream bug discussion at
facebookarchive/webscalesql-5.6#23

Reviewed By: @paulbiss

Differential Revision: D2390712

hphp/runtime/ext/mysql/mysql_common.cpp

@@ -68,7 +68,14 @@ static MySQLStaticInitializer s_mysql_initializer;
 int MySQLUtil::set_mysql_timeout(MYSQL *mysql,
                                  MySQLUtil::TimeoutType type,
                                  int ms) {
-   mysql_option opt = MYSQL_OPT_CONNECT_TIMEOUT;
+#ifdef __APPLE__
+  // Work around a bug in webscalesql where setting a read or write timeout
+  // causes most mysql connections to fail (depending on the exact timing of
+  // packets). See https://github.com/webscalesql/webscalesql-5.6/issues/23
+  return 0;
+#endif
+
+  mysql_option opt = MYSQL_OPT_CONNECT_TIMEOUT;
 #ifdef MYSQL_MILLISECOND_TIMEOUT
   switch (type) {
    case MySQLUtil::ConnectTimeout: opt = MYSQL_OPT_CONNECT_TIMEOUT_MS; break;