On 10/19/2011 02:05 PM, Bob Breuer wrote:
> Is it possible to force a
> stackframe by just adding a suitable attribute to either the setjmp
> function prototype, or the function which calls setjmp?
The only thing I can think of that'll be portable to a large number
of versions of GCC is
{
int n; char *p;
asm("" : "=r"(n) : "0"(1));
p = __builtin_alloca(n);
asm("" : : "r"(p));
}
The first asm prevents constant propagation of the 1 to the alloca;
the second asm prevents the alloca from being considered dead code.
r~
