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

Path csiph.com!eternal-september.org!feeder.eternal-september.org!reader01.eternal-september.org!.POSTED!not-for-mail
From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Multiple Includes Causing Multiple Definitions? (GCC 6.3.0) on Debian 9
Date Fri, 30 Nov 2018 14:56:05 -0800
Organization None to speak of
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Geoff <geoff@invalid.invalid> writes:
> On Fri, 30 Nov 2018 12:48:19 -0800, Geoff <geoff@invalid.invalid>
> wrote:
>
>>If I can produce a simple project that reproduces this result I'll
>>post it.
>>
>>Thanks for all the help.
>
> I found the error. One of the project headers, invoked by all the
> modules had this at the very top:
>
> #define __attribute__ (x)
>
> This will probably hose over just about any implementation and I'm
> surprised this problem didn't show up a long time ago. It sneaked into
> the code somewhere between 2010 and 2013. I blame Obama. :-)

I suspect it was actually

#define __attribute__(x)

without the space.  Normally __attribute__ (a common non-standard
extension) takes a doubly parenthesized argument, such as __attribute__
((packed))

The latter macro definition would remove all uses of __attribute__
(which would of course break any code that depends on it).

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

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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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