ref: 7c2da37ac070b9555af78aec088958a2664c65d7
parent: 72ff9501d14892e97a95cbf5c0a384ddc333b1dd
author: Roberto E. Vargas Caballero <[email protected]>
date: Thu Feb 23 05:06:58 EST 2017
[cc1] Fix pointer substraction with void* At this moment the code was strictly checking if the two pointers involved in a substraction had the same type, but this was an error because substracting any pointer with a null pointer should be allowed.
--- a/cc1/expr.c
+++ b/cc1/expr.c
@@ -304,7 +304,7 @@
size = sizeofnode(tp->type);
if (op == OSUB && BTYPE(rp) == PTR) {- if (!eqtype(tp, rp->type, 0))
+ if ((rp = convert(rp, lp->type, 0)) == NULL)
goto incorrect;
lp = node(OSUB, pdifftype, lp, rp);
return node(ODIV, inttype, lp, size);