[PATCH] Deprecate 32-bit off_t support

[Florian Weimer]

* Joseph Myers:

> On Mon, 7 Jan 2019, Florian Weimer wrote:
>
>> * Szabolcs Nagy:
>> 
>> > please do not recommend the use of a non-standard type
>> > in place of a standard one (off64_t is not even available
>> > with default feature test macros in posix headers).
>> 
>> What do you propose instead?  Mention int64_t and uint64_t only?
>
> Programs and libraries should use types such as off_t, and arrange to be 
> built with _FILE_OFFSET_BITS=64, which would make them unaffected by a 
> future change to the default.

If this concerns a public header file, is there a preprocessor check we
can recommend to add to the header file?  Something that causes an
#error if the ABI would not be correct?

Thanks,
Florian