How can Autoconf help with the transition to stricter compilation defaults?

[Michael Matz via cfe-commits]

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.