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Re: error_t proposal

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: error_t proposal
Date 2019-09-06 13:20 -0700
Organization None to speak of
Message-ID <ln36h9tbw6.fsf@kst-u.example.com> (permalink)
References (3 earlier) <lna7biv2pg.fsf@kst-u.example.com> <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>

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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.

A program may also `#define __STDC_WANT_LIB_EXT1__ 0` to disable Annex K
features (for example if it uses identifiers that are optionally defined
by Annex K).

Note that the value "201112L" doesn't appear correctly either in N1570
or in the published C11 standard.  Technical Corregendum 1 updated it,
and also gave the correct value for __STDC_VERSION__.

>> 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.)

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */

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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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