http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60647
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Non-K&R that ICEs the same way (with call through incompatible function pointer type): struct _wincore { int width, height; }; static void foo (void *dpy, struct _wincore *winInfo, int offset) { fn1 (winInfo->height); } static void bar (void *dpy, int winInfo, int *visrgn) { ((void (*) (void *, int, int)) foo) ((void *) 0, winInfo, 0); fn2 (0, 0, visrgn); } void baz (void *dpy, int win, int prop) { bar ((void *) 0, 0, (int *) 0); }