[Bug c/21160] how to force a variable into the stack?

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-04-22 14:24 -------
(In reply to comment #3)
> I have taken the address of 'ptr' and despite that, it was not excluded from the candidates 
> for register allocation - or the warning occurred despite of the variable being stack allocated. 
> In either case, it's a GCC bug. 

No you have not taken the address, as it will not escape or otherwise.  volatile in a local function is the 
same as almost as a non register. 
Another way to "fix" this would be do the following:
escape_function(&a);
and mark escape_function as no inline, but this might not work in the furture as we might know that 
escape_function does not escape that address, the way to work around that would be make a static file 
scope variable which gets assigned that pointer but even that might cause the escapeness in the future 
so the only correct way is mark the variable as volatile.

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21160