v3 won't build on AIX 4.1

[David Edelsohn]

>>>>> Benjamin Kosnik writes:

Ben> Yeah. We care. I haven't built on AIX.

>> The problem is that <sys/atomic_op.h> typedefs atomic_p and atomic_h,
>> but not atomic_l, that config/aix/bits/atomicity.h relies upon.  Do we
>> care?

	AIX 4.3 defines atomic_l in sys/atomic_op.h.

	As I mentioned when I first submitted the implementation, I do not
understand why atomicity.h uses both int and long types.  Does the
argument really need to be "long" for __compare_and_swap() while "int" for
__exchange_and_add() and __atomic_add()?

	We could avoid the atomic_l dependency altogether, if we were not
assuming "long" types.  If we need long types, we either need a different
implementation of those functions for AIX 4.1 or need to add casts to
"int" on AIX 4.1 where we know that the target only supports 32-bits.

David