[PATCH] Fix 32-bit SSIZE_MAX

Corinna Vinschen corinna-cygwin@cygwin.com
Thu Jul 14 18:50:00 GMT 2016


On Jul 14 12:39, Eric Blake wrote:
> On 07/14/2016 09:09 AM, Corinna Vinschen wrote:
> > On Jul 13 15:02, Eric Blake wrote:
> >> POSIX requires that SSIZE_MAX have the same type as ssize_t, but
> >> on 32-bit, we were defining it as a long even though ssize_t
> >> resolves to an int.  It also requires that SSIZE_MAX be usable
> >> via preprocessor #if, so we can't cheat and use a cast.
> >>
> >> If this were newlib, I'd have had to hack _intsup.h to probe the
> >> qualities of size_t (via gcc's __SIZE_TYPE__), similar to how we
> >> already probe the qualities of int8_t and friends, then cross our
> >> fingers that ssize_t happens to have the same rank (most systems
> >> do, but POSIX permits a system where they differ such as size_t
> >> being long while ssize_t is int).  Unfortunately gcc gives us
> >> neither __SSIZE_TYPE__ nor __SSIZE_MAX__.  On the other hand, our
> >> limits.h is specific to cygwin, we can just shortcut to the
> >> correct results rather than being generic to all possible ABI.
> >>
> >> Signed-off-by: Eric Blake <eblake@redhat.com>
> >> ---
> >>  winsup/cygwin/include/limits.h | 10 +++++++++-
> 
> > Looks good, please apply.
> 
> And I remembered to update the release notes, too.

Thumbs up.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat
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