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Re: error_t proposal

From Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups comp.lang.c
Subject Re: error_t proposal
Date 2019-09-06 21:47 +0100
Organization A noiseless patient Spider
Message-ID <871rwtxibp.fsf@bsb.me.uk> (permalink)
References (4 earlier) <0a0905d7-2c2d-45c0-b028-9de1f98fc9e0@googlegroups.com> <lnblvxthj9.fsf@kst-u.example.com> <ff9369c1-8c4b-4eb5-a21a-24a1a836b69d@googlegroups.com> <87mufhxksn.fsf@bsb.me.uk> <ln36h9tbw6.fsf@kst-u.example.com>

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Keith Thompson <kst-u@mib.org> writes:

> Ben Bacarisse <ben.usenet@bsb.me.uk> writes:
>> Thiago Adams <thiago.adams@gmail.com> writes:
>>> On Friday, September 6, 2019 at 3:18:44 PM UTC-3, Keith Thompson wrote:
>>>> Thiago Adams writes:
>>>> [...]
>>>> > I am happy to have found errno_t in the C11 standard.
>>>> > I will not change bool for errno_t in my current programs (because 
>>>> > this creates a inverse logic) but I intend to use errno_t in new 
>>>> > programs.
>>>> 
>>>> Then your new programs won't compile with implementations that don't
>>>> support the optional Annex K (unless you define errno_t yourself).
>>>
>>> When I compiled using VC++ 2019 I didn't have to add any defines
>>> like #define __STDC_WANT_LIB_EXT1__ 1 to use errno_t or other.
>>> I guess it is not following the standard in this case.
>>
>> No, that's permitted.  A C11 implementation should not define these
>> types etc. when __STDC_WANT_LIB_EXT1__ is defined to be 0 (at the
>> appropriate time) and it should when __STDC_WANT_LIB_EXT1__ is defined
>> to be 1, but the default (what happens when there is no explicit define
>> for __STDC_WANT_LIB_EXT1__) is left up to the implementation.
>
> Right.  There are three ways for an implementation to conform to C11
> with respect to Annex K:
>
> 1. Don't support it at all.  The macro __STDC_LIB_EXT1__ is not
>    predefined.  Defining or undefining __STDC_WANT_LIB_EXT1__
>    (probably) has no effect.
>
> 2. Support it, but disable it by default.  __STDC_LIB_EXT1__ is
>    predefined as 201112L.  A program that uses Annex K features
>    must define __STDC_WANT_LIB_EXT1__ as 1.
>
> 3. Support it and enable it by default.  __STDC_LIB_EXT1__ is
>    predefined as 201112L.  A program that uses Annex K features
>    may define __STDC_WANT_LIB_EXT1__ as 1.

That's clearer because it includes a reminder that the whole of Annex K
is optional.

<cut>
>>> I tried online some compilers and they are not recognizing
>>> errno_t even when I  use
>>> #define __STDC_WANT_LIB_EXT1__  1
>>
>> It would be helpful to see where that define is in your test case, along
>> with the compiler's name and the options you used.
>
> If you're using gcc or clang, that's expected; neither supports Annex K.
> (More precisely, the implementations I use, consisting of gcc or clang
> with glibc, do not support it.  I don't know whether gcc with a
> different library implementation might support Annex K.)

Ah.  For some reason I thought that gcc + recent glibc did, but that was
based on zero evidence.  Obviously just a wrong thought that somehow got
stuck in my head.

-- 
Ben.

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Thread

error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-04 14:14 -0700
  Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-04 15:20 -0700
    Re: error_t proposal Mateusz Viste <mateusz@wont.tell> - 2019-09-05 08:02 +0000
      Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 04:04 -0700
        Re: error_t proposal Bruce S <bruces42@hotmail.com> - 2019-09-05 08:18 -0600
          Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-05 14:31 -0700
            Re: error_t proposal James Kuyper <jameskuyper@alumni.caltech.edu> - 2019-09-05 17:49 -0400
              Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-05 15:14 -0700
            Re: error_t proposal Bruce S <bruces42@hotmail.com> - 2019-09-06 14:03 -0600
  Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-05 09:30 +1000
    Re: error_t proposal Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-09-05 02:38 -0700
    Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 04:57 -0700
      Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 05:16 -0700
        Re: error_t proposal Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-09-05 05:35 -0700
          Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 06:08 -0700
            Re: error_t proposal Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-09-05 06:16 -0700
              Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 06:37 -0700
                Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 07:04 -0700
                Re: error_t proposal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-09-05 20:51 +0100
                Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 13:52 -0700
                Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-05 14:56 -0700
              Re: error_t proposal William Ahern <william@25thandClement.com> - 2019-09-05 13:18 -0700
              Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-06 07:25 +1000
      Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-06 07:35 +1000
        Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-06 04:22 -0700
    Re: error_t proposal scott@slp53.sl.home (Scott Lurndal) - 2019-09-05 13:59 +0000
      Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-06 07:10 +1000
  Re: error_t proposal Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-09-05 10:01 +0000
    Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 04:36 -0700
      Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-05 14:43 -0700
        Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-06 05:01 -0700
          Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-06 11:18 -0700
            Re: error_t proposal scott@slp53.sl.home (Scott Lurndal) - 2019-09-06 19:34 +0000
            Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-06 12:37 -0700
              Re: error_t proposal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-09-06 20:54 +0100
                Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-06 13:20 -0700
                Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-06 13:43 -0700
                Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-06 14:25 -0700
                Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-06 15:14 -0700
                Re: error_t proposal Keith Thompson <kst-u@mib.org> - 2019-09-06 15:49 -0700
                Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-06 18:44 -0700
                Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-07 12:35 +1000
                Re: error_t proposal Ike Naar <ike@sdf.lonestar.org> - 2019-09-08 20:15 +0000
                Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-09 09:30 +1000
                Re: error_t proposal Ike Naar <ike@iceland.freeshell.org> - 2019-09-09 07:35 +0000
                Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-09 19:44 +1000
                Re: error_t proposal scott@slp53.sl.home (Scott Lurndal) - 2019-09-09 13:58 +0000
                Re: error_t proposal Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-09-10 14:24 +0000
                Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-11 09:22 +1000
                Re: error_t proposal Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-09-10 16:48 -0700
                Re: error_t proposal Clifford Heath <no.spam@please.net> - 2019-09-11 10:45 +1000
                Re: error_t proposal Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-09-06 21:47 +0100
  Re: error_t proposal jadill33@gmail.com - 2019-09-05 07:04 -0700
    Re: error_t proposal Thiago Adams <thiago.adams@gmail.com> - 2019-09-05 07:36 -0700
      Re: error_t proposal jadill33@gmail.com - 2019-09-05 08:43 -0700

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