gcc/testsuite/gcc.dg/tls/pr47715-5.c

/* { dg-do compile } */
/* { dg-options "-O2" } */
/* { dg-require-effective-target tls } */

extern __thread int __libc_errno __attribute__ ((tls_model ("initial-exec")));
;
int *
__errno_location (void)
{
  return &__libc_errno;
}