I had a go at writing a custom pass to try to locate places where GCC makes use of global state.
You can see the pass here (which I implemented using gcc-python-plugin): https://gcc-python-plugin.readthedocs.org/en/latest/working-with-c.html#finding-global-variables A build log from recompiling gcc using this pass can be seen at: http://fedorapeople.org/~dmalcolm/gcc/2013-05-01/make.log (about 12MB in size; I killed it when I saw that stage 1 was done). I'm sure there are quite a few false positives in there. Hope this is helpful. FWIW I had an earlier version of the pass which merely gave *declaration* sites for global variables, rather than all *uses* of such variables. Dave
