noreturn-4.c

this is a gcc file, you can download it and learn its usetility, for further detail please look at t

/* Check for "noreturn" warning in main. */
/* { dg-do compile } */
/* { dg-options "-O2 -Wmissing-noreturn -ffreestanding" } */
extern void exit (int) __attribute__ ((__noreturn__));

int
main (void)
{
  exit (0);
} /* { dg-warning "warning: function might be possible candidate for attribute `noreturn'" "warn for main" } */