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Groups > comp.lang.c > #120570

Re: Set the result of void function

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Set the result of void function
Date 2017-09-29 11:35 -0700
Organization None to speak of
Message-ID <lning1tks8.fsf@kst-u.example.com> (permalink)
References (16 earlier) <f0027021-e19c-40bb-b1c4-0f0f782e0d5d@googlegroups.com> <e34536b2-23bd-4286-be7a-c4a90bb3b34b@googlegroups.com> <596f824f-b750-47f1-9d66-60873e73ceef@googlegroups.com> <d8c57dfd-839b-4c1a-b19b-b34beedff13c@googlegroups.com> <67d49fc0-fa3d-434d-b79c-cb3041bcf72e@googlegroups.com>

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David Kleinecke <dkleinecke@gmail.com> writes:
> On Friday, September 29, 2017 at 9:44:41 AM UTC-7, james...@verizon.net wrote:
[...]
>> A hosted implementation of C is required to support the entire library.
>> 
>> You may have been confused by the fact that many C compilers are provided
>> without a copy of the standard library, relying upon some other vendor to
>> provide that library. However, such compilers only qualify as a conforming
>> implementation of C when combined with a compatible version of the C standard
>> library.
>
> As usual I go with C90 where fewer headers are required. But what
> matters is that stdio.h isn't.

<stdio.h> is absolutely required for hosted implementations.  It is not
required for freestanding implementations.  Please indicate that you
understand the distinction.

>                                I didn't assume va_arg etc. were
> not defined - only that the same effect could be obtained without
> using them. I don't like such a use but, so far as I can tell, I
> must allow it in my compiler.

Why must you allow it?  Are you building a compiler that you intend to
be used only as part of a freestanding implementation?  If so, you don't
have to worry, for purposes of your implementation, about <stdio.h>.
But <stdarg.h> is required for any conforming implementation, either
hosted for freestanding.

Since you're implementing the compiler, you can't just *assume* that
effect of the <stdarg.h> mechanisms can be obtained without using the
header, you have to make sure of it.  <stdarg.h> can't be implemented in
portable C, but it can be (and typically is) implemented in C that makes
some non-portable assumptions.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Thread

Set the result of void function Thiago Adams <thiago.adams@gmail.com> - 2017-09-19 14:23 -0700
  Re: Set the result of void function Thiago Adams <thiago.adams@gmail.com> - 2017-09-19 14:38 -0700
    Re: Set the result of void function gordonb.tfand@burditt.org (Gordon Burditt) - 2017-09-19 17:16 -0500
    Re: Set the result of void function "Pascal J. Bourguignon" <pjb@informatimago.com> - 2017-09-20 00:39 +0200
      Re: Set the result of void function James Kuyper <jameskuyper@verizon.net> - 2017-09-19 22:06 -0400
        Re: Set the result of void function "Pascal J. Bourguignon" <pjb@informatimago.com> - 2017-09-20 06:51 +0200
          Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-20 10:55 +0100
            Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-20 12:11 +0100
            Re: Set the result of void function fir <profesor.fir@gmail.com> - 2017-09-20 07:17 -0700
          Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-20 11:28 +0100
          Re: Set the result of void function mark.bluemel@gmail.com - 2017-09-20 03:30 -0700
            Re: Set the result of void function fir <profesor.fir@gmail.com> - 2017-09-20 06:53 -0700
              Re: Set the result of void function Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-09-21 03:50 -0500
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-21 11:00 +0100
                Re: Set the result of void function scott@slp53.sl.home (Scott Lurndal) - 2017-09-21 12:39 +0000
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-21 14:12 +0100
                Re: Set the result of void function scott@slp53.sl.home (Scott Lurndal) - 2017-09-21 13:51 +0000
                Re: Set the result of void function Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-09-21 08:36 -0600
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-21 17:51 +0100
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-21 10:06 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-22 08:51 +0200
                Plunging innocent people into poverty (Was: Set the result of void function) gazelle@shell.xmission.com (Kenny McCormack) - 2017-09-23 09:31 +0000
                Re: Plunging innocent people into poverty (Was: Set the result of void function) David Brown <david.brown@hesbynett.no> - 2017-09-23 12:09 +0200
                Re: Plunging innocent people into poverty (Was: Set the result of void function) gazelle@shell.xmission.com (Kenny McCormack) - 2017-09-23 10:25 +0000
                Re: Plunging innocent people into poverty Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2017-09-23 10:43 -0600
                Re: Plunging innocent people into poverty supercat@casperkitty.com - 2017-09-23 10:41 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-22 09:37 +0200
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-22 11:27 +0100
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-22 14:42 +0200
                Re: Set the result of void function Jorgen Grahn <grahn+nntp@snipabacken.se> - 2017-09-24 12:09 +0000
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-25 08:31 +0200
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-25 03:52 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-25 13:25 +0200
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-25 04:58 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-25 14:20 +0200
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-25 13:44 +0100
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-25 15:09 +0200
                Re: Set the result of void function Thiago Adams <thiago.adams@gmail.com> - 2017-09-25 05:44 -0700
                Re: Set the result of void function Thiago Adams <thiago.adams@gmail.com> - 2017-09-25 05:58 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-25 15:15 +0200
                Re: Set the result of void function Thiago Adams <thiago.adams@gmail.com> - 2017-09-25 06:46 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-25 16:01 +0200
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-25 07:18 -0700
                Re: Set the result of void function Thiago Adams <thiago.adams@gmail.com> - 2017-09-25 07:55 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-25 08:49 -0700
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-25 09:21 -0700
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-25 09:51 -0700
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-25 21:57 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-25 15:03 -0700
                Re: Set the result of void function Öö Tiib <ootiib@hot.ee> - 2017-09-25 21:34 -0700
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-26 04:28 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-27 08:26 +0200
                Re: Set the result of void function "James R. Kuyper" <jameskuyper@verizon.net> - 2017-09-27 11:48 -0400
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 08:54 +0200
                Re: Set the result of void function gordonb.iddsu@burditt.org (Gordon Burditt) - 2017-09-28 23:33 -0500
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-27 09:15 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-27 17:50 +0100
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-27 10:35 -0700
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-27 18:47 +0100
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-27 10:52 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-27 11:10 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 09:10 +0200
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-27 11:06 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-27 20:01 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-27 12:26 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-27 20:38 +0100
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-27 13:00 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-27 21:54 +0100
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-27 14:12 -0700
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-27 14:34 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-27 23:16 +0100
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-27 16:09 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 01:12 +0100
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-28 02:03 +0100
                Re: Set the result of void function Ian Collins <ian-news@hotmail.com> - 2017-09-28 17:31 +1300
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 09:55 +0200
                Re: Set the result of void function Ian Collins <ian-news@hotmail.com> - 2017-09-28 21:00 +1300
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 10:48 +0100
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 13:20 +0200
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-28 11:29 +0100
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-27 20:27 -0700
                Re: Set the result of void function Gareth Owen <gwowen@gmail.com> - 2017-09-29 19:30 +0100
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-29 19:45 +0100
                Re: Set the result of void function Jerry Stuckle <jstucklex@attglobal.net> - 2017-09-29 14:49 -0400
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-27 15:07 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 09:42 +0200
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 13:55 +0100
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 17:22 +0200
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 09:14 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 20:13 +0200
                Re: Set the result of void function Gareth Owen <gwowen@gmail.com> - 2017-09-29 19:42 +0100
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-28 09:14 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 09:25 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 20:17 +0200
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 17:39 +0100
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-28 10:10 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 19:05 +0100
                Re: Set the result of void function "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2017-09-28 14:20 -0400
                Re: Set the result of void function Ian Collins <ian-news@hotmail.com> - 2017-09-29 07:52 +1300
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-28 11:59 -0700
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-28 18:50 +0100
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 19:47 +0100
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 21:57 +0200
                Re: Set the result of void function "James R. Kuyper" <jameskuyper@verizon.net> - 2017-09-28 16:14 -0400
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-28 13:17 -0700
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 21:23 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 13:55 -0700
                Re: Set the result of void function Gareth Owen <gwowen@gmail.com> - 2017-09-29 19:50 +0100
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-28 13:57 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-28 23:18 +0200
                Re: Set the result of void function "James R. Kuyper" <jameskuyper@verizon.net> - 2017-09-28 17:38 -0400
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-28 15:54 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-29 08:59 +0200
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 14:43 -0700
                Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-29 10:43 +0200
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-29 07:43 -0700
                Re: Set the result of void function Gareth Owen <gwowen@gmail.com> - 2017-09-30 19:21 +0100
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-30 19:45 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 13:31 -0700
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-28 13:41 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 14:07 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-28 16:25 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 18:45 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-28 19:54 -0700
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-28 20:51 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-28 22:39 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-29 09:16 -0700
                Re: Set the result of void function gazelle@shell.xmission.com (Kenny McCormack) - 2017-09-29 16:17 +0000
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-29 11:05 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-29 11:23 -0700
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-29 12:15 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-29 16:04 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-29 16:44 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-30 10:04 -0700
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-30 10:33 -0700
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-29 11:26 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-29 16:03 -0700
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-29 09:44 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-29 11:15 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-29 11:35 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-29 16:11 -0700
                Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-29 16:14 -0700
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-30 08:55 -0700
                Re: Set the result of void function jameskuyper@verizon.net - 2017-09-29 11:36 -0700
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-29 12:05 +0100
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-29 12:17 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-29 09:15 -0700
                Re: Set the result of void function Ian Collins <ian-news@hotmail.com> - 2017-09-29 09:42 +1300
                Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-28 21:55 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 14:12 -0700
                Re: Set the result of void function "James R. Kuyper" <jameskuyper@verizon.net> - 2017-09-28 17:22 -0400
                Re: Set the result of void function Gareth Owen <gwowen@gmail.com> - 2017-09-29 19:50 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 09:00 -0700
                Re: Set the result of void function supercat@casperkitty.com - 2017-09-28 09:35 -0700
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-28 10:57 -0700
                Re: Set the result of void function Thiago Adams <thiago.adams@gmail.com> - 2017-09-25 10:35 -0700
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-25 06:57 -0700
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-25 16:32 +0100
                Re: Set the result of void function Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-09-25 08:43 -0700
                Re: Set the result of void function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-09-25 22:12 +0100
                Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-25 09:03 -0700
                Re: Set the result of void function Jorgen Grahn <grahn+nntp@snipabacken.se> - 2017-09-25 14:17 +0000
          Re: Set the result of void function "James R. Kuyper" <jameskuyper@verizon.net> - 2017-09-20 11:32 -0400
        Re: Set the result of void function fir <profesor.fir@gmail.com> - 2017-09-20 01:50 -0700
          Re: Set the result of void function David Kleinecke <dkleinecke@gmail.com> - 2017-09-20 15:56 -0700
  Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-19 23:01 +0100
    Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-20 15:40 +0200
      Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-20 08:50 -0700
        Re: Set the result of void function David Brown <david.brown@hesbynett.no> - 2017-09-20 22:52 +0200
          Re: Set the result of void function supercat@casperkitty.com - 2017-09-20 15:04 -0700
    Re: Set the result of void function supercat@casperkitty.com - 2017-09-20 07:39 -0700
  Re: Set the result of void function jameskuyper@verizon.net - 2017-09-19 15:18 -0700
    Re: Set the result of void function bartc <bc@freeuk.com> - 2017-09-20 01:21 +0100
      Re: Set the result of void function jameskuyper@verizon.net - 2017-09-19 19:40 -0700
  Re: Set the result of void function rockbrentwood@gmail.com - 2017-09-19 16:36 -0700
    Re: Set the result of void function James Kuyper <jameskuyper@verizon.net> - 2017-09-19 22:13 -0400
    Re: Set the result of void function gazelle@shell.xmission.com (Kenny McCormack) - 2017-09-22 01:48 +0000
  Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-19 19:36 -0700
  Re: Set the result of void function mark.bluemel@gmail.com - 2017-09-20 01:00 -0700
    Re: Set the result of void function fir <profesor.fir@gmail.com> - 2017-09-20 02:01 -0700
  Re: Set the result of void function Keith Thompson <kst-u@mib.org> - 2017-09-20 08:36 -0700
  Re: Set the result of void function "James R. Kuyper" <jameskuyper@verizon.net> - 2017-09-20 11:36 -0400
  Re: Set the result of void function John Bode <jfbode1029@gmail.com> - 2017-09-20 15:30 -0700

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