It all reminds me a story when I won a bottle of beer from my
scientific adviser back in 2005. We had a bet: will gcc compile this
code:
#include <stdio.h>
int main() {
printf("a");
int a;
printf("b");
return 0;
}
He was so sure that gcc won't allow it that didn't ever tried :) Thus,
I think gnu extensions by default are not so bad :)
Alexey
