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Re: C Macros Badly Defined?

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From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: C Macros Badly Defined?
Date Wed, 31 May 2017 09:11:41 -0700
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David Brown <david.brown@hesbynett.no> writes:
> On 31/05/17 01:50, supercat@casperkitty.com wrote:
[...]
>> Indeed, but some programmers seem to think that permission to behave
>> nonsensically should be viewed, in and of itself, as a compelling reason
>> to behave nonsensically.  
>
> Name /one/ such programmer.  Give even /one/ example where you can
> clearly demonstrate that the reason a compiler behaves in a
> "nonsensical" manner is purely because it is allowed to behave
> "nonsensically".  Of course, you can't demonstrate this from a single
> program - you have to show that there are /no/ correct programs that
> don't benefit in some way from the compiler feature.

I'm aware of exactly one such example.  A #pragma directive "causes
the implementation to behave in an implementation-defined manner".
When this feature was added to the language, gcc 1.17 implemented
it by invoking a game at compile time (hack, or rogue, or Towers of
Hanoi in emacs).  This was of course a joke, and has no particular
bearing on this discussion.  (I think the feature was later removed).

[...]

-- 
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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Re: C Macros Badly Defined? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-24 08:16 -0700
  Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-05-24 10:43 -0700
    Re: C Macros Badly Defined? Ike Naar <ike@iceland.freeshell.org> - 2017-05-24 19:06 +0000
    Re: C Macros Badly Defined? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-27 06:10 -0700
      Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-05-27 12:02 -0700
        Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-05-27 13:42 -0700
          Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-05-27 15:48 -0700
            Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-05-28 14:40 -0700
            Re: C Macros Badly Defined? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-29 08:33 -0700
        Re: C Macros Badly Defined? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-29 08:17 -0700
          Re: C Macros Badly Defined? bartc <bc@freeuk.com> - 2017-05-29 16:26 +0100
            Re: C Macros Badly Defined? Tim Rentsch <txr@alumni.caltech.edu> - 2017-05-30 06:13 -0700
              Re: C Macros Badly Defined? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-30 09:57 -0700
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-30 19:12 +0200
                Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-05-30 14:55 -0700
                Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-05-30 15:39 -0700
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-05-30 16:03 -0700
                Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-05-30 16:50 -0700
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-05-30 17:12 -0700
                Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-05-31 06:30 -0700
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-05-31 09:36 -0700
                Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-05-31 12:08 -0700
                Re: C Macros Badly Defined? scott@slp53.sl.home (Scott Lurndal) - 2017-05-31 19:16 +0000
                Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-05-31 12:35 -0700
                Re: C Macros Badly Defined? Tim Rentsch <txr@alumni.caltech.edu> - 2017-06-01 04:06 -0700
                Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-06-01 10:33 -0700
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-06-01 12:00 -0700
                Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-06-01 15:35 -0700
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-06-01 17:26 -0700
                Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-06-01 20:48 -0700
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-05-31 12:43 -0700
                Re: C Macros Badly Defined? David Kleinecke <dkleinecke@gmail.com> - 2017-05-31 21:50 -0700
                Re: C Macros Badly Defined? raltbos@xs4all.nl (Richard Bos) - 2017-06-03 11:36 +0000
                Re: C Macros Badly Defined? gazelle@shell.xmission.com (Kenny McCormack) - 2017-06-03 11:44 +0000
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-06-03 09:19 -0700
                Re: C Macros Badly Defined? gazelle@shell.xmission.com (Kenny McCormack) - 2017-06-03 16:22 +0000
                Re: Standards in various formats Noob <root@127.0.0.1> - 2017-06-01 13:24 +0200
                Re: C Macros Badly Defined? jadill33@gmail.com - 2017-05-31 13:02 -0700
                Re: C Macros Badly Defined? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-05-30 22:06 -0700
                Re: C Macros Badly Defined? David Brown <david.brown@hesbynett.no> - 2017-05-31 12:51 +0200
                Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-05-31 06:21 -0700
                Re: C Macros Badly Defined? David Brown <david.brown@hesbynett.no> - 2017-05-31 17:16 +0200
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-31 17:24 +0200
                Re: C Macros Badly Defined? "Pascal J. Bourguignon" <pjb@informatimago.com> - 2017-05-31 22:18 +0200
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-31 23:09 +0200
                Re: C Macros Badly Defined? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-31 17:32 -0400
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-05-31 23:50 +0200
                Re: C Macros Badly Defined? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-31 18:01 -0400
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-06-01 00:33 +0200
                Re: C Macros Badly Defined? Jerry Stuckle <jstucklex@attglobal.net> - 2017-05-31 22:36 -0400
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-06-01 06:08 +0200
                Re: C Macros Badly Defined? Jerry Stuckle <jstucklex@attglobal.net> - 2017-06-01 11:08 -0400
                Re: C Macros Badly Defined? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-06-01 01:30 -0700
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-06-01 11:38 +0200
                Re: C Macros Badly Defined? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-06-01 03:13 -0700
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-06-01 12:25 +0200
                Re: C Macros Badly Defined? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-06-01 04:48 -0700
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-06-01 14:27 +0200
                Re: C Macros Badly Defined? Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2017-06-01 05:55 -0700
                Re: C Macros Badly Defined? Jerry Stuckle <jstucklex@attglobal.net> - 2017-06-01 11:11 -0400
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-06-01 17:40 +0200
                Re: C Macros Badly Defined? Ian Collins <ian-news@hotmail.com> - 2017-06-02 08:32 +1200
                Re: C Macros Badly Defined? GOTHIER Nathan <nathan.gothier@gmail.com> - 2017-06-01 23:14 +0200
                Re: C Macros Badly Defined? jameskuyper@verizon.net - 2017-06-01 14:41 -0700
                Re: C Macros Badly Defined? Ian Collins <ian-news@hotmail.com> - 2017-06-02 09:48 +1200
                Re: C Macros Badly Defined? David Brown <david.brown@hesbynett.no> - 2017-06-02 00:56 +0200
                Re: C Macros Badly Defined? Ian Collins <ian-news@hotmail.com> - 2017-06-02 11:12 +1200
                Re: C Macros Badly Defined? raltbos@xs4all.nl (Richard Bos) - 2017-06-03 11:54 +0000
                Re: C Macros Badly Defined? Leon Taylor <leontaylor476@gmail.com> - 2017-06-03 05:10 -0700
                Re: C Macros Badly Defined? David Brown <david.brown@hesbynett.no> - 2017-06-04 14:32 +0200
                Re: C Macros Badly Defined? Melzzzzz <Melzzzzz@zzzzz.com> - 2017-06-01 21:44 +0000
                Re: C Macros Badly Defined? raltbos@xs4all.nl (Richard Bos) - 2017-06-03 11:51 +0000
                Re: C Macros Badly Defined? gazelle@shell.xmission.com (Kenny McCormack) - 2017-06-01 21:38 +0000
                Re: C Macros Badly Defined? Ian Collins <ian-news@hotmail.com> - 2017-06-02 11:10 +1200
                Re: C Macros Badly Defined? gazelle@shell.xmission.com (Kenny McCormack) - 2017-06-01 23:34 +0000
                Re: C Macros Badly Defined? raltbos@xs4all.nl (Richard Bos) - 2017-06-03 11:48 +0000
                Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-06-01 08:56 -0700
                Re: C Macros Badly Defined? David Brown <david.brown@hesbynett.no> - 2017-06-02 14:11 +0200
                Re: C Macros Badly Defined? supercat@casperkitty.com - 2017-06-02 10:02 -0700
                Re: C Macros Badly Defined? raltbos@xs4all.nl (Richard Bos) - 2017-06-03 11:45 +0000
                Re: C Macros Badly Defined? Keith Thompson <kst-u@mib.org> - 2017-05-31 09:11 -0700
                Re: C Macros Badly Defined? raltbos@xs4all.nl (Richard Bos) - 2017-06-03 11:29 +0000

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