re PR middle-end/78858 (Bogus -Wnonnull warning involving strcmp with -fsanitize=undefined)

	PR middle-end/78858
	* c-c++-common/ubsan/pr78858.c: New test.
	* gcc.dg/nonnull-5.c: New test.

From-SVN: r243884

gcc/testsuite/ChangeLog

+2016-12-22  Jakub Jelinek  <jakub@redhat.com>
+
+	PR middle-end/78858
+	* c-c++-common/ubsan/pr78858.c: New test.
+	* gcc.dg/nonnull-5.c: New test.
+
 2016-12-21  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/72707

gcc/testsuite/c-c++-common/ubsan/pr78858.c

+/* PR middle-end/78858 */
+/* { dg-do compile } */
+/* { dg-options "-fsanitize=undefined -Wnonnull" } */
+
+void
+foo (char **x, const char *y)
+{
+  *x = (char *) __builtin_malloc (__builtin_strlen (y) + 1);	/* { dg-bogus "argument 1 null where non-null expected" } */
+  __builtin_strcpy (*x, y);
+}

gcc/testsuite/gcc.dg/nonnull-5.c

+/* Reduced from https://sourceware.org/bugzilla/show_bug.cgi?id=20978 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -Wnonnull" } */
+
+int
+foo (const char *name)
+{
+  if (name)
+    return 6;
+  return __builtin_strlen (name);	/* { dg-warning "argument 1 null where non-null expected" } */
+}