gcc/testsuite/gcc.dg/c90-longlong-1.c

/* Test for long long: in C99 only.  */
/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
/* { dg-do compile } */
/* { dg-options "-std=iso9899:1990 -pedantic-errors" } */

long long foo; /* { dg-error "long long" "long long not in C90" } */