[Bug c/67316] Address local variable returned as 0x0

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67316

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is undefined behavior.  Returning the address of a local variable is
undefined.
If you want to trick the compiler though here is a better solution (than just
moving the address taking out of the return):
ptr_t GC_approx_sp2(void)
{
    volatile word dummy;
    dummy = 42;
    ptr_t ret = (ptr_t)&dummy;
    asm("":"+r"(ret));
    return ret;
}