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Re: [PATCHv3 00/24] ILP32 support in ARM64
- From: Zack Weinberg <zackw at panix dot com>
- To: Rich Felker <dalias at libc dot org>
- Cc: libc-alpha at sourceware dot org
- Date: Sun, 15 Feb 2015 10:41:36 -0500
- Subject: Re: [PATCHv3 00/24] ILP32 support in ARM64
- Authentication-results: sourceware.org; auth=none
- References: <CAKCAbMiQh2DVjgB_-By8FN2VN01_BkEoVJQunJ9KhWdYM8wJOw at mail dot gmail dot com> <20150215042302 dot GN23507 at brightrain dot aerifal dot cx>
On Sat, Feb 14, 2015 at 11:23 PM, Rich Felker <firstname.lastname@example.org> wrote:
> On Sat, Feb 14, 2015 at 02:18:15PM -0500, Zack Weinberg wrote:
>> Joseph Myers wrote:
>> > I believe I made clear in the discussion of 64-bit time interfaces for
>> > 32-bit systems that the x32 ABI mistake was not one to be repeated - that
>> > since there is obviously no need for nanoseconds values that cannot fit in
>> > 32 bits, nanoseconds (and microseconds) values should remain as long in
>> > accordance with POSIX.
>> I have to say that I think tv_nsec (and tv_usec) being specified as
>> bare 'long' is a spec bug _in and of itself_. The various *_t types
>> exist precisely to make this sort of problem go away. As such, I am
>> inclined to think that the _proper_ fix is to file DRs to that effect,
>> and then invent 'nseconds_t' and use it. Unconditionally - not just
>> for ILP32-on-64-bit-kernel.
> POSIX does that nonsense, yes. ISO C, not so much. There's utterly no
> reason for the type of tv_nsec to be abstract like this,
If you don't consider this very thread to demonstrate adequate reason
for the type of tv_nsec to be abstract, then there's probably no point
me arguing it with you any further, but ...
> having it be abstract creates all sorts of additional problems.
Please state exactly what those problems are.
> In any case ISO C DR's do not move fast
Too bad for ISO C then. In sufficiently egregious cases, - and yes, I
do think this qualifies - implementors can and should declare the
standard to be buggy and apply corrections ahead of the process.