https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63779
--- Comment #3 from Richard PALO <richard at netbsd dot org> --- Well, apparently this was affecting many using gcc 4.9.x and a workaround was given here https://bugzilla.mozilla.org/show_bug.cgi?id=999496 I tested it and now have (as with 4.8.x): >richard@omnis:/tmp/pkgsrc/devel/xulrunner31/work/build/content/media$ nm -C >MediaDecoderReader.o |grep MallocSizeOf >[148] | 0| 29|FUNC |WEAK |2 |90 >|mozilla::AudioQueueMemoryFunctor::MallocSizeOf(const void*) > > [_ZN7mozilla23AudioQueueMemoryFunctor12MallocSizeOfEPKv] >[145] | 0| 29|FUNC |WEAK |2 |87 >|mozilla::VideoQueueMemoryFunctor::MallocSizeOf(const void*) > > [_ZN7mozilla23VideoQueueMemoryFunctor12MallocSizeOfEPKv] Is there any further information I can provide now to find this nasty problem?