gcc/testsuite/c-c++-common/cpp/warning-zero-location.c - gcc - Git at Google

 /*
    { dg-options "-D _GNU_SOURCE -fdiagnostics-show-caret" }
    { dg-do compile }
  */

 #define _GNU_SOURCE 	/* { dg-warning "-:redefined" } */

 /* { dg-message "" "#define _GNU_SOURCE" {target *-*-* } 0 } */
	/*
	{ dg-options "-D _GNU_SOURCE -fdiagnostics-show-caret" }
	{ dg-do compile }
	*/

	#define _GNU_SOURCE /* { dg-warning "-:redefined" } */

	/* { dg-message "" "#define _GNU_SOURCE" {target --* } 0 } */