-#define SETPVSBIT(pvs,b) ((b) >= 0 ? (unsigned char) ((pvs)[(b) >> 3] |= (1 << ((b) & 7))) : (unsigned char) false)
-#define CLEARPVSBIT(pvs,b) ((b) >= 0 ? (unsigned char) ((pvs)[(b) >> 3] &= ~(1 << ((b) & 7))) : (unsigned char) false)
+#define SETPVSBIT(pvs,b) (void) ((b) >= 0 ? (unsigned char) ((pvs)[(b) >> 3] |= (1 << ((b) & 7))) : (unsigned char) false)
+#define CLEARPVSBIT(pvs,b) (void) ((b) >= 0 ? (unsigned char) ((pvs)[(b) >> 3] &= ~(1 << ((b) & 7))) : (unsigned char) false)