gmp.h needs to detect bit width more dynamically to support universal builds on mac

[Niels Möller]

Torbjorn Granlund <tg at gmplib.org> writes:

> This is a can of worms.  I think a GMP-specific solution to this problem
> would be a mistake.  Instead, a GNU-wide solution is needed.

For libraries, I understand this position.

But I don't think it's the same for headers. Most libraries have system
independent headers. And those which haven't, I think the common case of
system dependencies are definitions of types of particular bit size,
which is a problem of the past as <stdint.h> gets adopted.

Here, GMP is an exception, and we could have a GMP specific solution.

And then gmp.h depends not only on the system, but also on the
--enable-nails configure flag, which makes it more hairy. Now, nails are
not really working, but are there any system with multiple ABIs where
using nails would make sense? If not, it makes the problem a bit easer
to solve.

Regards,
/Niels

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