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Groups > comp.lang.c > #3436

Re: puzzling error

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: puzzling error
Date 2011-05-07 11:20 -0700
Organization None to speak of
Message-ID <lnmxiype2x.fsf@nuthaus.mib.org> (permalink)
References (1 earlier) <ipu74e$r3m$1@news.cict.fr> <4dc2daae$0$5070$bbae4d71@news.suddenlink.net> <79udnSOPKtxVdV_QnZ2dnUVZ_v6dnZ2d@bestweb.net> <4dc2ec05$0$5045$bbae4d71@news.suddenlink.net> <iq2u62$cc3$1@online.de>

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"Joachim Schmitz" <nospam.jojo@schmitz-digital.de> writes:
> Bill Cunningham wrote:
>> Kenneth Brody wrote:
>>
>>> On gcc (and many other compilers, though the Standard is mute on the
>>> subject of command line flags to a compiler), the "-D_GNU_SOURCE"
>>> flag on the command line is equivalent of putting this at the top of
>>> the source file:
>>>     #define _GNU_SOURCE
>>>
>>> You say you tried the #define in the source file.  Did you put it
>>> above the #include <string.h> line?  These two versions are _not_
>>> equivalent:
>>>     #define _GNU_SOURCE
>>>     #include <stdio.h>
>>>     #include <string.h>
>>> and
>>>     #include <stdio.h>
>>>     #include <string.h>
>>>     #define _GNU_SOURCE
>>
>>    No I put the define in the middle of the two include directives.
>
> If that didn't help, this would indicate that stdio.h includes string.h, and 
> the 'include header guard' of string.h prevents it's content from being seen 
> the 2nd time thru.
> The '-D_GNU_SOURCE' is equivalent to a #define at the start of your source

I don't think a conforming stdio.h *can* include string.h.

I suggest that guessing about the consequences of what *might*
be in Bill's source file is a waste of time.  If he wants help,
he can post the source (rather than vaguely describing it).

There might (on certain systems) be things in <stdio.h> that are
affected by _GNU_SOURCE.  If you're going to #define _GNU_SOURCE,
you should do so at the very top of the source file, before any
#include directives.  If you're not doing that, and you're having
problems, moving the #define to the top of the file should be the
first thing you try.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Nokia
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

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Thread

puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 08:44 -0400
  Re: puzzling error Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-05-05 13:56 +0100
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:11 -0400
      Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 09:26 -0700
        Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 13:26 -0400
        Re: puzzling error Chad <cdalten@gmail.com> - 2011-05-05 11:34 -0700
        Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 14:52 -0400
        Re: puzzling error Paul N <gw7rib@aol.com> - 2011-05-05 13:39 -0700
          Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 13:54 -0700
        Re: puzzling error Seebs <usenet-nospam@seebs.net> - 2011-05-05 20:38 +0000
          Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 14:11 -0700
          Re: puzzling error Angel <angel+news@spamcop.net> - 2011-05-05 23:40 +0000
      Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-05 13:55 -0400
        Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 14:04 -0400
          Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-09 13:26 -0400
        Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 11:31 -0700
    Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 09:06 -0700
      Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:30 -0400
      Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-05 13:40 -0400
      Re: puzzling error Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-05-05 21:32 +0100
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 13:34 -0400
      Re: puzzling error Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-05-05 21:38 +0100
        Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-06 02:39 -0400
          Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 23:40 -0700
  Re: puzzling error Ike Naar <ike@sverige.freeshell.org> - 2011-05-05 13:01 +0000
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:05 -0400
      Re: puzzling error Angel <angel+news@spamcop.net> - 2011-05-05 16:23 +0000
    Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 09:08 -0700
  Re: puzzling error Marc Boyer <Marc.Boyer@cert.onera.fr.invalid> - 2011-05-05 13:02 +0000
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:34 -0400
      Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:35 -0400
      Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:40 -0400
      Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-05 14:08 -0400
        Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 11:35 -0700
          Re: puzzling error Angel <angel+news@spamcop.net> - 2011-05-05 18:54 +0000
            OT: man strfry (was Re: puzzling error) Kenneth Brody <kenbrody@spamcop.net> - 2011-05-09 13:33 -0400
              Re: man strfry (was Re: puzzling error) "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-11 14:30 -0400
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 13:13 -0400
      Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-05 14:13 -0400
        Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 14:27 -0400
          Re: puzzling error "Joachim Schmitz" <nospam.jojo@schmitz-digital.de> - 2011-05-07 09:59 +0200
            Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-07 11:20 -0700
  Re: puzzling error August Karlstrom <fusionfile@gmail.com> - 2011-05-05 15:58 +0200
  Re: puzzling error "osmium" <r124c4u102@comcast.net> - 2011-05-05 10:38 -0500
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:03 -0400
      Re: puzzling error Joe Wright <joewwright@comcast.net> - 2011-05-05 13:19 -0400
      Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-05 13:34 -0400
        Re: puzzling error "osmium" <r124c4u102@comcast.net> - 2011-05-05 12:54 -0500
        Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 14:08 -0400
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:06 -0400
    Re: puzzling error Keith Thompson <kst-u@mib.org> - 2011-05-05 09:11 -0700
      Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:36 -0400
    Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-05 13:33 -0400
  Re: puzzling error Angel <angel+news@spamcop.net> - 2011-05-05 16:01 +0000
    Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:09 -0400
      Re: puzzling error Angel <angel+news@spamcop.net> - 2011-05-05 16:19 +0000
        Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:28 -0400
          Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 12:42 -0400
            Re: puzzling error "Bill Cunningham" <nospam@nspam.invalid> - 2011-05-05 13:16 -0400
      Re: puzzling error Kenneth Brody <kenbrody@spamcop.net> - 2011-05-05 13:41 -0400

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