return memory that is guaranteed to be set to zero. This can have
a severe efficiency penalty, so it should never be set if good
performance is desired, but it can help when you're debugging code. */
-#define GFC_CLEAR_MEMORY
+/* #define GFC_CLEAR_MEMORY */
/* If GFC_CHECK_MEMORY is defined, we do some sanity checks at runtime.
This causes small overhead, but again, it also helps debugging. */