portability of 64-bit types?

[Ben Pfaff]

I am considering using a 64-bit type in one bit of code in GNU
PSPP.  I could avoid it, but using it makes the code easier to
read.  Is anyone aware of an implementation (on which GNU
programs are commonly used) that does not support a 64-bit or
wider integer type?

I'm aware that MSVC doesn't support 64-bit integers under the
name "long long", so I'm planning to use gnulib's stdint.h, which
already has the necessary incantations, and access the type as
uint_least64_t.

-- 
Peter Seebach on managing engineers:
"It's like herding cats, only most of the engineers are already
 sick of laser pointers."