[Bug libc/13575] SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t, when __WORDSIZE != 64

[eblake at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=13575

--- Comment #8 from Eric Blake <eblake at redhat dot com> ---
(In reply to Florian Weimer from comment #7)
> I think the proposed change is still incorrect on s390, where ssize_t is
> long int.
> 
> Would this be a suitable generic definition?
> 
> #define SSIZE_MAX ((ssize_t) ((~(size_t) 0) / 2))

No, because SSIZE_MAX must be usable in #if preprocessor conditionals.

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