gcc/testsuite/gcc.misc-tests/dg-5.c

/* Test the tester.  */
/* { dg-prms-id 42 } */
/* { dg-do run } */
/* The \n is left out of the pattern because tcl's exec will remove it.  */
/* { dg-output {^Hello world[.]$} } */

#include <stdio.h>

main () { printf ("Hello world.\n"); return 0; }