I wrote:
>> BTW, do you know of any modern non-Windows platforms that don't define
>> LLONG_MIN and LLONG_MAX?  It may well be that the "two's complement"
>> fallback hasn't been exercised in recent years.
> 
> Anyting compiled with strict ANSI pre-C99 mode, e.g. gcc -ansi, (...)

which also disables 'long long', so such examples are moot.  duh.