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Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9

From Ian Collins <ian-news@hotmail.com>
Newsgroups comp.lang.c
Subject Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9
Date 2018-11-28 20:45 +1300
Message-ID <g66vc6F8pfeU7@mid.individual.net> (permalink)
References <0fgrvdluhenh4otagch5r1pe7oprhpkhco@4ax.com> <g66dbaF8pfeU3@mid.individual.net> <p74svdhv14dotma4udd64a62d1n1t5avh8@4ax.com> <g66kllF8pfeU6@mid.individual.net> <ptbsvdhcsvf7sdqii5r1ckspjq0gm250v6@4ax.com>

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On 28/11/2018 19:06, Geoff wrote:
> On Wed, 28 Nov 2018 17:42:29 +1300, Ian Collins <ian-news@hotmail.com>
> wrote:
> 
>> On 28/11/2018 16:53, Geoff wrote:
>>> On Wed, 28 Nov 2018 15:37:30 +1300, Ian Collins <ian-news@hotmail.com>
>>> wrote:
>>>
>>>> On 28/11/2018 11:38, Geoff wrote:
>>>>> First, this isn't a C question but I know there are a lot of
>>>>> GCC-knowledgeable people in this group so I'm seeking tribal
>>>>> knowledge.
>>>>>
>>>>> This project used to compile without error on a previous version of
>>>>> Debian but now is failing to link on a newer version. The makefile and
>>>>> project code have not changed.
>>>>>
>>>>> Link failure messages are of the type:
>>>>> ....
>>>>> performance.o: In function `atoi':
>>>>> performance.c:(.text+0x360): multiple definition of `atoi'
>>>>> g_ai.o:g_ai.c:(.text+0x360): first defined here
>>>>> performance.o: In function `atol':
>>>>> performance.c:(.text+0x380): multiple definition of `atol'
>>>>> g_ai.o:g_ai.c:(.text+0x380): first defined here
>>>>> performance.o: In function `atoll':
>>>>> performance.c:(.text+0x390): multiple definition of `atoll'
>>>>> g_ai.o:g_ai.c:(.text+0x390): first defined here
>>>>> ....
>>>>>
>>>>> All the errors appear to concern multiple definitions of
>>>>> implementation and library symbols/functions.
>>>>
>>>> Have you checked the obvious such as including the the correct standard
>>>> headers?
>>>
>>> Define "correct standard headers".
>>>
>>> Some of the standard headers included in the project's main header
>>> are:
>>>
>>> #include <assert.h>
>>> #include <float.h>
>>> #include <limits.h>
>>> #include <math.h>
>>> #include <stdio.h>
>>> #include <stdarg.h>
>>> #include <string.h>
>>> #include <stdlib.h>
>>
>> Fine, you have <stdlib.h>.  The question is, what's in performance.c?
>> Is there another atoi?
>
> None that I can see...
> It devolves to a printf call in Linux
OK, I assume there's a g_ai.c somewhere, could there be another 
definition there?  Do both files include <stdlib.h>?

-- 
Ian.

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Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-27 14:38 -0800
  Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Ian Collins <ian-news@hotmail.com> - 2018-11-28 15:37 +1300
    Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-27 19:53 -0800
      Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Ian Collins <ian-news@hotmail.com> - 2018-11-28 17:42 +1300
        Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-27 22:06 -0800
          Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Ian Collins <ian-news@hotmail.com> - 2018-11-28 20:45 +1300
            Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-28 10:30 -0800
              Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 jameskuyper@alumni.caltech.edu - 2018-11-28 11:01 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-29 01:35 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 James Kuyper <jameskuyper@alumni.caltech.edu> - 2018-11-29 08:15 -0500
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-30 12:48 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-30 14:49 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Keith Thompson <kst-u@mib.org> - 2018-11-30 14:56 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-30 15:46 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 David Brown <david.brown@hesbynett.no> - 2018-12-01 17:51 +0100
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Richard Damon <Richard@Damon-Family.org> - 2018-12-01 13:37 -0500
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 David Brown <david.brown@hesbynett.no> - 2018-12-02 12:49 +0100
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Richard Damon <Richard@Damon-Family.org> - 2018-12-02 08:16 -0500
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 David Brown <david.brown@hesbynett.no> - 2018-12-02 14:45 +0100
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-12-04 08:51 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 scott@slp53.sl.home (Scott Lurndal) - 2018-12-04 17:16 +0000
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 William Ahern <william@25thandClement.com> - 2018-12-04 12:26 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-12-05 07:08 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 William Ahern <william@25thandClement.com> - 2018-12-05 13:39 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-12-05 20:25 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Tim Rentsch <txr@alumni.caltech.edu> - 2018-12-06 07:01 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Tim Rentsch <txr@alumni.caltech.edu> - 2018-11-29 10:26 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-30 12:59 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Tim Rentsch <txr@alumni.caltech.edu> - 2018-12-01 07:23 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Tim Rentsch <txr@alumni.caltech.edu> - 2018-12-02 03:56 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-12-02 08:10 -0800
                Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Tim Rentsch <txr@alumni.caltech.edu> - 2018-12-03 14:00 -0800
              Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Nick Bowler <nbowler@draconx.ca> - 2018-11-28 19:42 +0000
              Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Tim Rentsch <txr@alumni.caltech.edu> - 2018-11-29 10:09 -0800
          Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 jameskuyper@alumni.caltech.edu - 2018-11-28 05:55 -0800
            Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-28 10:36 -0800
  Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Bart <bc@freeuk.com> - 2018-11-28 13:13 +0000
    Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9 Geoff <geoff@invalid.invalid> - 2018-11-30 13:39 -0800

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