Description of problem:
rpmbuild -bb NetworkManager.spec fails with fatal compile errors using gcc 4.8.2

Version-Release number of selected component (if applicable):
NetworkManager-0.9.9.0-22.git20131003.fc20
gcc-4.8.2-7.fc20

How reproducible:
Always

Steps to Reproduce:
1. Install SRPM for NetworkManager
2. Attempt to build binary packages: rpmbuild -bb NetworkManager.spec

Actual results:
Build fails with "all warnings being treated as errors"

Expected results:
Binary packages should be produced.

Additional info:
Example compile error:
nm-remote-settings.c: In function 'nm_remote_settings_load_connections':
nm-remote-settings.c:667:551: error: return makes integer from pointer without a cast [-Werror]
  g_return_val_if_fail (NM_IS_REMOTE_SETTINGS (settings), NULL);
                                                                       ^
nm-remote-settings.c:668:262: error: return makes integer from pointer without a cast [-Werror]
  g_return_val_if_fail (filenames != NULL, NULL);
                      ^
cc1: all warnings being treated as errors
make[4]: *** [libnm_glib_la-nm-remote-settings.lo] Error 1