From: Jakub Jelinek <jakub@gcc.gnu.org>
Date: Thu, 20 Dec 2012 10:40:26 +0000 (+0100)
Subject: re PR c/39464 (Attribute may_alias causes invalid warning)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1ac13b9c058d6ff982b1fa6cf2fa1515a9692b5e;p=gcc.git

re PR c/39464 (Attribute may_alias causes invalid warning)

	PR c/39464
	* c-typeck.c (convert_for_assignment): For -Wpointer-sign
	warning require that both c_common_unsigned_type as well as
	c_common_signed_type is the same for both mvl and mvr types.

	* gcc.dg/pr39464.c: New test.

From-SVN: r194630
---

diff --git a/gcc/testsuite/gcc.dg/pr39464.c b/gcc/testsuite/gcc.dg/pr39464.c
new file mode 100644
index 00000000000..cd745406da8
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr39464.c
@@ -0,0 +1,19 @@
+/* PR c/39464 */
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+typedef int T __attribute__((may_alias));
+typedef unsigned int U __attribute__((may_alias));
+
+void
+foo (void *p)
+{
+  T *a = (int *) p;		/* { dg-warning "initialization from incompatible pointer type" } */
+  int *b = (T *) p;		/* { dg-warning "initialization from incompatible pointer type" } */
+  U *c = (unsigned int *) p;	/* { dg-warning "initialization from incompatible pointer type" } */
+  unsigned int *d = (U *) p;	/* { dg-warning "initialization from incompatible pointer type" } */
+  (void) a;
+  (void) b;
+  (void) c;
+  (void) d;
+}