Build ok with gcc 4.8, 4.9 and 5.1
Build fails with gcc 4.4 (default compiler on RHEL/CentOS 6)
src/mongoc/mongoc-matcher-op.c: In function '_mongoc_matcher_op_compare_new':
src/mongoc/mongoc-matcher-op.c:166: error: #pragma GCC diagnostic not allowed inside functions
src/mongoc/mongoc-matcher-op.c:167: error: #pragma GCC diagnostic not allowed inside functions
src/mongoc/mongoc-matcher-op.c:172: error: #pragma GCC diagnostic not allowed inside functions