gcc/testsuite/gcc.dg/tls/pr47715-3.c

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

struct initial_sp
{
  void *sp;
  long len;
};
__thread 
struct initial_sp __morestack_initial_sp;
void bar (void *);
void
foo ()
{
  bar (&__morestack_initial_sp.len);
}