cvt.c (ocp_convert): Use additional warning sentinel.

/cp
2019-11-20  Paolo Carlini  <paolo.carlini@oracle.com>

	* cvt.c (ocp_convert): Use additional warning sentinel.

/testsuite
2019-11-20  Paolo Carlini  <paolo.carlini@oracle.com>

	* g++.dg/warn/multiple-sign-compare-warn-1.C: New.

From-SVN: r278475

gcc/cp/ChangeLog

+2019-11-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* cvt.c (ocp_convert): Use additional warning sentinel.
+
 2019-11-19  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/92414

gcc/cp/cvt.c

@@ -847,6 +847,7 @@ ocp_convert (tree type, tree expr, int convtype, int flags,
 	      /* Prevent bogus -Wint-in-bool-context warnings coming
 		 from c_common_truthvalue_conversion down the line.  */
 	      warning_sentinel w (warn_int_in_bool_context);
+	      warning_sentinel c (warn_sign_compare);
 	      return cp_truthvalue_conversion (e, complain);
 	    }
 	}

gcc/testsuite/ChangeLog

+2019-11-20  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	* g++.dg/warn/multiple-sign-compare-warn-1.C: New.
+
 2019-11-20  Joseph Myers  <joseph@codesourcery.com>
 
 	* gcc.dg/c2x-attr-deprecated-2.c, gcc.dg/c2x-attr-fallthrough-2.c,

gcc/testsuite/g++.dg/warn/multiple-sign-compare-warn-1.C

+// { dg-options "-Wsign-compare" }
+
+int foo()
+{
+  unsigned char b = '1';
+
+  bool x = ~b; // { dg-bogus "promoted bitwise complement of an unsigned value is always nonzero.*promoted bitwise complement of an unsigned value is always nonzero" }
+ // { dg-warning "promoted bitwise complement of an unsigned value is always nonzero" "" { target *-*-* } .-1 }
+
+  return 0;
+}