misc/176628: [stdint.h] use safer way of definint __WORDSIZE

[Dmitry Marakasov]

* Bruce Evans (brde at optusnet.com.au) wrote:

> > __WORDSIZE is always defined as 32, which is wrong on 64bit systems.
> >
> > I have two solutions for the problem.
> > First one uses the same way of testing for 64bit pointers, but doesn't define __WORDSIZE if it can't be detected reliably.
> 
> C++ code should be happier with __WORDSIZE being undefined that with it
> being defined to garbage.
> 
> > Second one uses different way of testing for 64bit pointers with checking for __LP64__.
> >
> > The second one looks much more useful, but I'm not sure if __LP64__ has the right semantics and will work in all platforms.
> 
> Not right, but better than the UINTPTR_MAX test.  Both are broken and default
> to __WORDSIZE == 32 if pointers are not precisely 64 bits.  Actually, the
> __LP64__ test is more fragile, since it fails if __L32_P64__ and many systems
> use that.  Just not any FreeBSD systems, so it is valid to use a hackish
> ifdef that only works on current FreeBSD systems.

So, what solution do you think is the best in current situation?

-- 
Dmitry Marakasov   .   55B5 0596 FF1E 8D84 5F56  9510 D35A 80DD F9D2 F77D
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