scc

commit 96c513c259241630f8397815acfc4da6fcb57237
parent 30feebeac1f5fe74efaf305468fdc332e1b9ee0e
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Thu, 23 Feb 2017 10:06:58 +0100

[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.

Diffstat:
M
cc1/expr.c
 | 
2
+-

1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/cc1/expr.c b/cc1/expr.c
@@ -304,7 +304,7 @@ parithmetic(int op, Node *lp, Node *rp)
 	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);