gcc/testsuite/gcc.dg/cpp/gnu11-warning-1.c

/* Test #warning not in C11.  */
/* { dg-do preprocess } */
/* { dg-options "-std=gnu11 -pedantic-errors" } */

#warning example text /* { dg-warning "example text" } */
/* { dg-error "'#warning' before C23 is a GCC extension" "pedantic" { target *-*-* } .-1 } */