Re: Can a variable be both static and extern

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.lang.c
Subject	Re: Can a variable be both static and extern
Date	2017-03-24 17:41 +0100
Organization	A noiseless patient Spider
Message-ID	<ob3i26$5fo$2@dont-email.me> (permalink)
References	<6e7c0a5e-70aa-4163-b29a-3625ffc541d0@googlegroups.com> <58d50784.12570828@news.xs4all.nl> <ob3gad$var$1@dont-email.me> <ob3gvq$1mg$1@dont-email.me>

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On 24/03/17 17:23, James Kuyper wrote:
> On 03/24/2017 12:11 PM, David Brown wrote:
> ...
>> The question is, are there any real uses of:
>>
>> static int foo;
>> extern int foo;
>>
>> in the same translation unit (as different headers if you like) ?
>>
>> I can't think of any myself.  I find it odd that this combination is
>> allowed - I see no good uses for it, and it could easily occur as a
>> mistake (especially for people who write "extern" declarations directly
>> in the their C code, rather than just in headers).
>>
>> Of course, it could just be my lack of imagination here!
> 
> It probably is - and I say that while having the same lack of
> imagination. The relevant clause in the standard serves no other purpose
> than to define the meaning of this combination of declarations, so it's
> presence must have been intentional - the committee must have had a
> reason for approving that wording. I have no idea what that reason was.
> 

Careful - Richard will bite you for arguing by appealing to authority!

There is probably some important historical code that has this
combination which had been allowed by an existing compiler, and the
standards committee did not want to break the old code.  Compatibility
with existing code is the reason behind a lot of strange things in the
standards.

Thread

Can a variable be both static and extern acidlategamer@gmail.com - 2017-03-24 04:23 -0700
  Re: Can a variable be both static and extern Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 11:40 +0000
    Re: Can a variable be both static and extern acidlategamer@gmail.com - 2017-03-24 04:54 -0700
      Re: Can a variable be both static and extern Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 12:09 +0000
        Re: Can a variable be both static and extern James Kuyper <jameskuyper@verizon.net> - 2017-03-24 11:45 -0400
          Re: Can a variable be both static and extern raltbos@xs4all.nl (Richard Bos) - 2017-03-25 22:27 +0000
    Re: Can a variable be both static and extern Keith Thompson <kst-u@mib.org> - 2017-03-24 11:35 -0700
  Re: Can a variable be both static and extern Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-03-24 12:11 +0000
  Re: Can a variable be both static and extern raltbos@xs4all.nl (Richard Bos) - 2017-03-24 12:14 +0000
    Re: Can a variable be both static and extern David Brown <david.brown@hesbynett.no> - 2017-03-24 17:11 +0100
      Re: Can a variable be both static and extern scott@slp53.sl.home (Scott Lurndal) - 2017-03-24 16:22 +0000
        Re: Can a variable be both static and extern David Brown <david.brown@hesbynett.no> - 2017-03-24 17:38 +0100
      Re: Can a variable be both static and extern James Kuyper <jameskuyper@verizon.net> - 2017-03-24 12:23 -0400
        Re: Can a variable be both static and extern David Brown <david.brown@hesbynett.no> - 2017-03-24 17:41 +0100
          Re: Can a variable be both static and extern jameskuyper@verizon.net - 2017-03-24 09:57 -0700
          Re: Can a variable be both static and extern supercat@casperkitty.com - 2017-03-24 10:38 -0700
          Re: Can a variable be both static and extern Richard Heathfield <rjh@cpax.org.uk> - 2017-03-24 18:24 +0000
            Re: Can a variable be both static and extern "James R. Kuyper" <jameskuyper@verizon.net> - 2017-03-25 10:47 -0400
              Re: Can a variable be both static and extern Richard Heathfield <rjh@cpax.org.uk> - 2017-03-25 16:48 +0000
                Re: Can a variable be both static and extern Keith Thompson <kst-u@mib.org> - 2017-03-25 10:31 -0700
                Re: Can a variable be both static and extern Richard Heathfield <rjh@cpax.org.uk> - 2017-03-25 18:23 +0000
                Re: Can a variable be both static and extern supercat@casperkitty.com - 2017-03-25 12:28 -0700
                Re: Can a variable be both static and extern Ike Naar <ike@iceland.freeshell.org> - 2017-03-25 19:50 +0000
                Re: Can a variable be both static and extern supercat@casperkitty.com - 2017-03-25 13:20 -0700
                Re: Can a variable be both static and extern jameskuyper@verizon.net - 2017-03-25 10:44 -0700
                Re: Can a variable be both static and extern supercat@casperkitty.com - 2017-03-25 12:13 -0700

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