GC_start_call_back  256 gc/alloc.c         if (GC_start_call_back != (void (*) GC_PROTO((void)))0) {
GC_start_call_back  257 gc/alloc.c     	(*GC_start_call_back)();
GC_start_call_back 1368 gc/include/private/gc_priv.h extern void (*GC_start_call_back) GC_PROTO((void));
GC_start_call_back   97 gc/misc.c      void (*GC_start_call_back) GC_PROTO((void)) = (void (*) GC_PROTO((void)))0;