[Xen-devel] Casting 64-bit pointers to integers

[Michael David Crawford <mdc@xxxxxxxxx>]

In building on my 64-bit Xeon box, I see a lot of warnings about casting 
between pointers and integers of different sizes.
Sometimes it can cause fatal compiler error.

Is there a reasonably portable way to make such casts?

The conventional wisdom is that ints are supposed to be the natural 
machine word size.  But even that isn't always the case - much gnashing 
of teeth resulted in the two most popular compilers for the 68000 
Macintosh having different int sizes.
There are typedefs for integers with specific numbers of bits, but 
that's not what we want.  If we're building for 32-bit, we want a 32-bit 
integer, and if we're building for 64-bit, we want a 64-bit integer.
Is there any kind of standardized integer type which is guaranteed to be 
the same size as a pointer?
What might even be worse is that the mismatch is on purpose for some 
reason, say that some structure has a field that simply *must* be 
32-bits, but we're trying to wedge a 64-bit pointer into it.
Mike
--
Michael David Crawford
mdc@xxxxxxxxx

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