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Groups > comp.lang.c > #65828

Re: Error messages

From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: Error messages
Date 2015-07-17 21:24 -0700
Organization None to speak of
Message-ID <ln615ihz3g.fsf@kst-u.example.com> (permalink)
References <mo9ik5$i9v$1@dont-email.me> <moa2c9$lir$1@dont-email.me> <moabue$e75$1@dont-email.me> <6e397d0b-4082-4915-97e1-0db8020b4241@googlegroups.com>

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David Kleinecke <dkleinecke@gmail.com> writes:
[...]
> A compiler implementation could have a dictionary of all the identifiers
> in the Standard Library (and feel free to extend to any other units 
> you like) so that if it sees an identifier in a position where it is not
> being declared it could search for the identifier in the dictionary and 
> add the needed header before proceeding. The compiler must emit a 
> message (warning?) teeling you what it did.  
>
> Anybody ever done that?

Certainly.

$ cat c.c
int main(void) {
    printf("hello\n");
}
$ c gcc -c c.c
c.c: In function 'main':
c.c:2:5: warning: incompatible implicit declaration of built-in function
'printf' [enabled by default]
     printf("hello\n");
     ^
$ 

It happens to do this for "printf" but not for FILE -- though if you
write

    FILE *tmp;

without the proper #include, it does recognize that it's a type name.

-- 
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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Thread

Error messages jacobnavia <jacob@jacob.remcomp.fr> - 2015-07-17 02:36 +0200
  Re: Error messages Richard Heathfield <rjh@cpax.org.uk> - 2015-07-17 01:51 +0100
    Re: Error messages Keith Thompson <kst-u@mib.org> - 2015-07-16 18:24 -0700
      Re: Error messages Lőrinczy Zsigmond <nospam@for.me> - 2015-07-17 09:31 +0200
        Re: Error messages Richard Heathfield <rjh@cpax.org.uk> - 2015-07-17 08:35 +0100
          Re: Error messages glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-17 09:11 +0000
            Re: Error messages Richard Heathfield <rjh@cpax.org.uk> - 2015-07-17 10:30 +0100
            Re: Error messages Ian Collins <ian-news@hotmail.com> - 2015-07-17 21:44 +1200
              Re: Error messages Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-07-17 12:55 +0100
              Re: Error messages Melzzzzz <mel@zzzzz.com> - 2015-07-17 19:53 +0200
              Re: Error messages glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-07-17 17:55 +0000
                Re: Error messages James Kuyper <jameskuyper@verizon.net> - 2015-07-17 14:19 -0400
            Re: Error messages raltbos@xs4all.nl (Richard Bos) - 2015-07-19 21:44 +0000
        Re: Error messages gazelle@shell.xmission.com (Kenny McCormack) - 2015-07-17 07:38 +0000
          Re: Error messages Noob <root@127.0.0.1> - 2015-07-17 09:58 +0200
            Re: Error messages gazelle@shell.xmission.com (Kenny McCormack) - 2015-07-17 13:32 +0000
      Re: Error messages Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-07-18 11:13 +0100
  Re: Error messages James Kuyper <jameskuyper@verizon.net> - 2015-07-16 22:36 -0400
  Re: Error messages Reinhardt Behm <rbehm@hushmail.com> - 2015-07-17 13:05 +0800
    Re: Error messages jacobnavia <jacob@jacob.remcomp.fr> - 2015-07-17 09:48 +0200
      Re: Error messages David Kleinecke <dkleinecke@gmail.com> - 2015-07-17 19:23 -0700
        Re: Error messages Keith Thompson <kst-u@mib.org> - 2015-07-17 21:24 -0700
          Re: Error messages David Kleinecke <dkleinecke@gmail.com> - 2015-07-18 18:29 -0700
            Re: Error messages Keith Thompson <kst-u@mib.org> - 2015-07-18 20:59 -0700
              Re: Error messages David Kleinecke <dkleinecke@gmail.com> - 2015-07-19 19:22 -0700
            Re: Error messages David Brown <david.brown@hesbynett.no> - 2015-07-21 11:40 +0200
              Compiler conformance (Was: Error messages) gazelle@shell.xmission.com (Kenny McCormack) - 2015-07-21 11:40 +0000
                Re: Compiler conformance Noob <root@127.0.0.1> - 2015-07-21 14:01 +0200
                Re: Compiler conformance gazelle@shell.xmission.com (Kenny McCormack) - 2015-07-21 13:47 +0000
        Re: Error messages Reinhardt Behm <rbehm@hushmail.com> - 2015-07-18 13:38 +0800
    Re: Error messages Keith Thompson <kst-u@mib.org> - 2015-07-17 07:54 -0700
      Re: Error messages raltbos@xs4all.nl (Richard Bos) - 2015-07-19 22:00 +0000
        Re: Error messages Richard Damon <Richard@Damon-Family.org> - 2015-07-19 19:47 -0400
  Re: Error messages jacobnavia <jacob@jacob.remcomp.fr> - 2015-07-17 10:06 +0200
  Re: Error messages Bartc <bc@freeuk.com> - 2015-07-17 12:07 +0100
  Re: Error messages Noob <root@127.0.0.1> - 2015-07-17 13:14 +0200
    Re: Error messages Bartc <bc@freeuk.com> - 2015-07-17 12:40 +0100
  Re: Error messages gwowen <gwowen@gmail.com> - 2015-07-17 04:32 -0700
    Re: Error messages jacobnavia <jacob@jacob.remcomp.fr> - 2015-07-17 14:15 +0200
      Re: Error messages gwowen <gwowen@gmail.com> - 2015-07-17 05:25 -0700
        Re: Error messages Bartc <bc@freeuk.com> - 2015-07-17 13:34 +0100
          Re: Error messages Keith Thompson <kst-u@mib.org> - 2015-07-17 08:07 -0700
        Re: Error messages jacobnavia <jacob@jacob.remcomp.fr> - 2015-07-17 14:38 +0200
          Re: Error messages Martin Shobe <martin.shobe@yahoo.com> - 2015-07-17 08:50 -0500
            Re: Error messages jacobnavia <jacob@jacob.remcomp.fr> - 2015-07-17 16:08 +0200
              Re: Error messages Martin Shobe <martin.shobe@yahoo.com> - 2015-07-17 09:24 -0500
                Re: Error messages James Kuyper <jameskuyper@verizon.net> - 2015-07-17 12:26 -0400
                Re: Error messages Martin Shobe <martin.shobe@yahoo.com> - 2015-07-17 13:19 -0500
                Re: Error messages James Kuyper <jameskuyper@verizon.net> - 2015-07-17 14:28 -0400
                Re: Error messages James Kuyper <jameskuyper@verizon.net> - 2015-07-17 14:43 -0400
                Re: Error messages Bartc <bc@freeuk.com> - 2015-07-17 20:31 +0100
                Re: Error messages Martin Shobe <martin.shobe@yahoo.com> - 2015-07-18 08:41 -0500
                Re: Error messages David Brown <david.brown@hesbynett.no> - 2015-07-21 12:25 +0200
                Re: Error messages James Kuyper <jameskuyper@verizon.net> - 2015-07-21 13:20 -0400
                Re: Error messages David Brown <david.brown@hesbynett.no> - 2015-07-22 00:05 +0200
          Re: Error messages Noob <root@127.0.0.1> - 2015-07-17 16:16 +0200
            Re: Error messages doctor@doctor.nl2k.ab.ca (The Doctor) - 2015-07-17 14:49 +0000
              Re: Error messages Noob <root@127.0.0.1> - 2015-07-17 20:02 +0200
                Re: Error messages The Doctor <doctor@doctor.nl2k.ab.ca> - 2015-07-17 22:24 +0000
                Re: Error messages Noob <root@127.0.0.1> - 2015-07-20 10:46 +0200
                Re: Error messages doctor@doctor.nl2k.ab.ca (The Doctor) - 2015-07-20 14:59 +0000
          Re: Error messages Keith Thompson <kst-u@mib.org> - 2015-07-17 08:25 -0700
      Re: Error messages raltbos@xs4all.nl (Richard Bos) - 2015-07-19 22:07 +0000
  Re: Error messages Ed Prochak <edprochak@gmail.com> - 2015-07-17 20:11 -0700

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