expr.c (eval_token): Append "evaluates to 0" to Wundef diagnostic.

2016-08-19  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

libcpp/
	* expr.c (eval_token): Append "evaluates to 0" to Wundef diagnostic.

testsuite/
	* gcc.dg/cpp/warn-undef.c: Append "evaluates to 0" to dg-error.
	* gcc.dg/cpp/warn-undef-2.c: Likewise.

From-SVN: r239609

gcc/testsuite/ChangeLog

+2016-08-19  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	* gcc.dg/cpp/warn-undef.c: Append "evaluates to 0" to dg-error.
+	* gcc.dg/cpp/warn-undef-2.c: Likewise.
+
 2016-08-19  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/77286

gcc/testsuite/gcc.dg/cpp/warn-undef-2.c

 // { dg-do preprocess }
 // { dg-options "-std=gnu99 -fdiagnostics-show-option -Werror=undef" }
 /* { dg-message "some warnings being treated as errors" "" {target "*-*-*"} 0 } */
-#if x  // { dg-error "\"x\" is not defined .-Werror=undef." }
+#if x  // { dg-error "\"x\" is not defined, evaluates to 0 .-Werror=undef." }
 #endif

gcc/testsuite/gcc.dg/cpp/warn-undef.c

 // { dg-do preprocess }
 // { dg-options "-std=gnu99 -fdiagnostics-show-option -Wundef" }
 
-#if x  // { dg-warning "\"x\" is not defined .-Wundef." }
+#if x  // { dg-warning "\"x\" is not defined, evaluates to 0 .-Wundef." }
 #endif

libcpp/ChangeLog

+2016-08-19  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
+
+	* expr.c (eval_token): Append "evaluates to 0" to Wundef diagnostic.
+
 2016-08-18  David Malcolm  <dmalcolm@redhat.com>
 
 	* directives.c (directive_names): New array.

libcpp/expr.c

@@ -1073,7 +1073,7 @@ eval_token (cpp_reader *pfile, const cpp_token *token,
 	  result.low = 0;
 	  if (CPP_OPTION (pfile, warn_undef) && !pfile->state.skip_eval)
 	    cpp_warning_with_line (pfile, CPP_W_UNDEF, virtual_location, 0,
-				   "\"%s\" is not defined",
+				   "\"%s\" is not defined, evaluates to 0",
 				   NODE_NAME (token->val.node.node));
 	}
       break;