Comment 47 for bug 931637

I'm not convinced this is a compiler bug at all now. The implementation of js::Vector<long, 8ul, js::TempAllocPolicy>::growStorageBy(unsigned long) in jswrapper.o looks correct, and is actually perfectly ok. The issue is that another implementation of this is getting linked in to the final .so instead (from js/xpconnect/src/dombindings.o, which is also using js::AutoIdVector - see dombindings.cpp). This implementation is optimized differently because it only uses js::AutoIdVector::append(), which explains my finding in comment 19.

This also explains comment 5.

I imagine that it's just pure luck that this works with newer gcc versions...