Question about building hash values from pointers

[Paolo Bonzini]

>>> it's uintptr_t which should be used, if only as an intermediate cast -
>>> (unsigned long)(uintptr_t)ptr.
>> That's not possible because, IIRC, gcc must compile on C90 systems.
> 
> Right, so the only type remaining is size_t. IIRC there is problem for 
> this type on some targets, too. AFAIC there are 24-bit pointers ...
> This is the reason, why I was querying to introduce a new general type for 
> such stuff in gcc.

size_t is ok I think, but just in case, there is an autoconf macro (used 
in libgfortran and libdecnumber) that provides int*_t.

Paolo