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Re: Correct type of SSIZE_MAX for 32-bit (bug 13575)
On Tue, 6 Feb 2018, Florian Weimer wrote:
> On 02/01/2018 09:37 PM, Joseph Myers wrote:
> > +ssize_t x;
> > +extern __typeof (SSIZE_MAX) x;
>
> Does this assert the equivalence of the types (just like a pointer assignment
> would do)? Maybe at a comment to that effect?
Yes, this asserts equivalence of types (without any dependence on -Werror,
incompatible types for the same object produces an unconditional hard
error). I've added a comment "Test SSIZE_MAX has type ssize_t.".
> I'm not sure if __WORDSIZE32_SIZE_ULONG is the right condition for that
> because it does not seem to govern the actual definition if size_t/ssize_t,
> but with the compile test to check for consistency, it's good enough, I think.
I think this is already adequately explained in both the patch description
and the comment
/* ssize_t is not formally required to be the signed type
corresponding to size_t, but it is for all configurations supported
by glibc. */
on the definition of SSIZE_MAX.
--
Joseph S. Myers
joseph@codesourcery.com