c-typeck.c (parser_build_binary_op): Don't call warn_logical_not_parentheses if…

c-typeck.c (parser_build_binary_op): Don't call warn_logical_not_parentheses if the RHS is TRUTH_NOT_EXPR.

	* c-typeck.c (parser_build_binary_op): Don't call
	warn_logical_not_parentheses if the RHS is TRUTH_NOT_EXPR.

	* c-c++-common/pr49706-2.c: New test.

From-SVN: r211902

gcc/c/ChangeLog

+2014-06-23  Marek Polacek  <polacek@redhat.com>
+
+	* c-typeck.c (parser_build_binary_op): Don't call
+	warn_logical_not_parentheses if the RHS is TRUTH_NOT_EXPR.
+
 2014-06-15  Jan Hubicka  <hubicka@ucw.cz>
 
 	* c-parser.c (c_parser_omp_threadprivate): Likewise.

gcc/c/c-typeck.c

@@ -3402,7 +3402,8 @@ parser_build_binary_op (location_t location, enum tree_code code,
 			   code1, arg1.value, code2, arg2.value);
 
   if (warn_logical_not_paren
-      && code1 == TRUTH_NOT_EXPR)
+      && code1 == TRUTH_NOT_EXPR
+      && code2 != TRUTH_NOT_EXPR)
     warn_logical_not_parentheses (location, code, arg1.value, arg2.value);
 
   /* Warn about comparisons against string literals, with the exception

gcc/testsuite/ChangeLog

+2014-06-23  Marek Polacek  <polacek@redhat.com>
+
+	* c-c++-common/pr49706-2.c: New test.
+
 2014-06-23  Alan Modra  <amodra@gmail.com>
 
 	* gcc.dg/pr61583.c: New.

gcc/testsuite/c-c++-common/pr49706-2.c

+/* { dg-do compile } */
+/* { dg-options "-Wlogical-not-parentheses" } */
+
+/* Test that we don't warn if both operands of the comparison
+   are negated.  */
+
+#ifndef __cplusplus
+#define bool _Bool
+#endif
+
+bool r;
+
+int
+same (int a, int b)
+{
+  r = !a == !b;
+  r = !!a == !!b;
+  r = !!a == !b;
+  r = !a == !!b;
+}