Hey,
On Wed, 16 Nov 2022, Alexander Monakov wrote:
> > The idea is so obvious that I'm probably missing something, why autoconf
> > can't use that idiom instead. But perhaps the (historic?) reasons why it
> > couldn't be used are gone now?
>
> Ironically, modern GCC and LLVM optimize '&foobar != 0' to '1' even at -O0,
> and thus no symbol reference remains in the resulting assembly.
Err, right, *head-->table*.
Playing with volatile should help:
char foobar(void);
char (* volatile ptr)(void);
int main(void) {
ptr = foobar;
return ptr != 0;
}
Ciao,
Michael.
