621af3aa07
OS X has weirdness when static linking. If a symbol is not initialized, it is put into the common block section, and Weird Things happen (linking when trying to using that global symbol will fail). If you initialize the variable, it goes into a different section (and linking to it will work). This link (that might go stale someday) has some information about OS X linker scope and treatment of symbol definitions: https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/MachOTopics/1-Articles/executing_files.html#//apple_ref/doc/uid/TP40001829-98432-TPXREF120 Fixes #375.