shithub: scc

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ref: 7c2da37ac070b9555af78aec088958a2664c65d7
parent: 72ff9501d14892e97a95cbf5c0a384ddc333b1dd
author: Roberto E. Vargas Caballero <k0ga@shike2.com>
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);