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Re: function declaration without args no longer works

From Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups comp.lang.c
Subject Re: function declaration without args no longer works
Date 2026-05-05 10:03 -0700
Organization A noiseless patient Spider
Message-ID <86ecjpwzye.fsf@linuxsc.com> (permalink)
References (1 earlier) <AABp7iAw8kQAAAp3.A3.flnews@WStation7.micha.freeshell.org> <10slehr$mho$1@reader1.panix.com> <10tasgg$7nu$1@reader1.panix.com> <86zf2ewcm8.fsf@linuxsc.com> <10tcc5j$e45$1@reader1.panix.com>

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John Forkosh <forkosh@panix.com> writes:

> Tim Rentsch <tr.17687@z991.linuxsc.com> wrote:
>
>> John Forkosh <forkosh@panix.com> writes:
>>
>>> John Forkosh <forkosh@panix.com> wrote:
>>>
>>>> Michael B?uerle <michael.baeuerle@gmx.net> wrote:
>>>>
>>>>> John Forkosh wrote:
>>>>>
>>>>> Have you tried "-std=c99" (or whatever standard
>>>>> your code was written for)?
>>>>
>>>> Thanks, Michael.  I've tried it now:) Indeed, as soon
>>>> as I saw your "-std=" I vaguely recalled that switch.
>>>> And, yeah, both -std=c99 and (as also suggested)
>>>> -std=gnu17 ignore the problem, and compile just fine
>>>> Thanks again.
>>>
>>> Update:  While subsequently trying to compile some even older
>>> code, written circa 1991, I had to go back even further,
>>> to -std=c89 (or equivalently -ansi as per the man cc page).
>>> And then, no errors, no warnings, not even with -pedantic.
>>
>> What were the sorts of things that caused diagnostics when
>> compiled under -std=c99?
>
> Three errors (identical with or without -pedantic)...
>
> bash-5.3$ cc -DTESTDRIVE -DNOTMSDOS -std=c99 -pedantic -lm \
>              treelib.c -o treelib
> treelib.c:  In function 'talloc':
> treelib.c:205:11: error: implicit declaration of function 'tallchk'
> [-Wimplicit-function-declaration]
>   205 |     if ( !tallchk() ) tree=(double *)NULL; /* set error if corrupt */
>       |           ^~~~~~~
> treelib.c:  At top level:
> treelib.c:1986:1: error: return type defaults to 'int' [-Wimplicit-int]
>  1986 | main ( argc, argv )
>       | ^~~~
> treelib.c:  In function 'main':
> treelib.c:2149:29: error: implicit declaration of function 'close';
> did you mean 'fclose'?  [-Wimplicit-function-declaration]
>  2149 |   if ( fp != (FILE *)NULL ) close(fp);  /* close output file */
>       |                             ^~~~~
>       |                             fclose
>
> ... at line  205, I indeed used tallchk() without declaring it
> within the talloc() function where it's used.
>     at line 1986, I indeed wrote main() instead of int main().
>     at line 2149, I indeed meant fclose().
> [...]

None of these problems is difficult to remedy.  Is that also true
for the diagnostics you see for other sources?  Or are some of them
harder to correct?  Do you have a breakdown of all the types of
flagged constructs in all of the source files (i.e., those that you
mention in a later posting)?

It would be interesting to know how many bugs would be turned up
(e.g., like the close()/fclose() confusion) by compiling with C99
rather than C89/C90.

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function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-26 13:59 +0000
  Re: function declaration without args no longer works Michael Bäuerle <michael.baeuerle@gmx.net> - 2026-04-26 16:24 +0200
    Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-26 16:29 +0000
      Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-05-04 19:36 +0000
        Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-05 00:15 -0700
          Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-05-05 09:10 +0000
            Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-05-05 11:17 +0200
              Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-05-05 11:07 +0000
            Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-05-05 02:24 -0700
              Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-05-05 11:20 +0000
              Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-05 18:09 +0000
                Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-05-07 12:52 +0000
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-07 14:51 +0000
              Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-06 11:41 +0200
            Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-05 10:03 -0700
              Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-05-07 12:35 +0000
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-05-08 07:36 -0700
                Re: function declaration without args no longer works antispam@fricas.org (Waldek Hebisch) - 2026-05-08 18:39 +0000
  Re: function declaration without args no longer works richard@cogsci.ed.ac.uk (Richard Tobin) - 2026-04-26 14:32 +0000
    Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-26 16:35 +0000
    Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-29 16:43 -0700
      Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-30 08:39 +0200
  Re: function declaration without args no longer works Michael S <already5chosen@yahoo.com> - 2026-04-26 17:50 +0300
    Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-26 16:39 +0000
      Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-27 00:30 +0000
        Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-27 08:30 +0200
          Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-28 07:02 +0000
            Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-28 10:16 +0200
              Re: function declaration without args no longer works antispam@fricas.org (Waldek Hebisch) - 2026-04-28 15:33 +0000
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-28 20:24 +0200
                Re: function declaration without args no longer works antispam@fricas.org (Waldek Hebisch) - 2026-04-28 20:22 +0000
              Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-29 06:22 +0000
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-29 09:15 +0200
                Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-04-29 10:06 +0200
                Re: function declaration without args no longer works Michael S <already5chosen@yahoo.com> - 2026-04-29 11:25 +0300
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-29 11:26 +0200
                Re: function declaration without args no longer works James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-04-29 20:07 -0400
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-30 00:14 +0000
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-29 17:57 -0700
                Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-04-30 03:09 +0200
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-30 00:48 -0700
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-30 20:18 -0700
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-01 04:12 +0000
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-30 23:29 -0700
                Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-05-01 19:31 +0200
                Re: function declaration without args no longer works James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-05-01 13:49 -0400
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-05-01 12:49 -0700
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-01 22:31 +0000
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-02 00:13 +0000
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-05-01 19:27 -0700
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-05-01 19:28 -0700
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-05-02 03:07 +0000
                Re: function declaration without args no longer works scott@slp53.sl.home (Scott Lurndal) - 2026-05-02 16:16 +0000
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-30 01:39 +0000
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-30 00:38 -0700
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-30 03:07 -0700
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-30 05:54 -0700
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-30 14:32 -0700
                Re: function declaration without args no longer works James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-04-30 09:45 -0400
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-30 12:48 -0700
                Re: function declaration without args no longer works Bart <bc@freeuk.com> - 2026-04-29 11:05 +0100
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-29 16:32 -0700
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-30 01:22 -0700
                Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-29 10:42 +0000
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-29 14:31 -0700
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-30 08:42 +0200
                Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-30 13:17 +0000
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-30 14:40 -0700
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-30 22:14 +0000
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-29 18:55 +0000
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-29 21:19 +0000
                Re: function declaration without args no longer works Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-04-29 16:46 -0700
            Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-04-28 14:25 +0200
              Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-28 13:13 +0000
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-28 15:48 +0200
                Re: function declaration without args no longer works Bart <bc@freeuk.com> - 2026-04-28 15:05 +0100
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-28 16:37 +0200
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-28 14:02 -0700
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-29 09:29 +0200
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-29 02:49 -0700
                Re: function declaration without args no longer works James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-04-29 20:06 -0400
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-29 17:13 -0700
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-30 00:45 +0000
                Re: function declaration without args no longer works James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-04-29 21:11 -0400
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-30 01:40 +0000
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-29 20:09 -0700
                Re: function declaration without args no longer works scott@slp53.sl.home (Scott Lurndal) - 2026-04-30 14:57 +0000
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-30 15:07 +0000
                Re: function declaration without args no longer works Bart <bc@freeuk.com> - 2026-04-30 16:20 +0100
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-30 16:10 +0000
                Re: function declaration without args no longer works Bart <bc@freeuk.com> - 2026-04-30 17:48 +0100
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-30 22:31 +0200
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-30 22:18 +0000
                Re: function declaration without args no longer works Bart <bc@freeuk.com> - 2026-05-01 00:25 +0100
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-01 00:08 +0000
                Re: function declaration without args no longer works Bart <bc@freeuk.com> - 2026-05-01 01:24 +0100
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-30 17:46 -0700
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-01 01:55 +0000
                Re: function declaration without args no longer works Bart <bc@freeuk.com> - 2026-05-01 10:48 +0100
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-05-01 11:20 +0000
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-30 20:23 -0700
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-05-01 10:32 +0200
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-30 14:43 -0700
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-30 22:34 +0000
                Re: function declaration without args no longer works James Kuyper <jameskuyper@alumni.caltech.edu> - 2026-05-01 13:32 -0400
                Re: function declaration without args no longer works scott@slp53.sl.home (Scott Lurndal) - 2026-05-01 18:12 +0000
                Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-04-30 03:50 +0200
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-30 08:52 +0200
                Re: function declaration without args no longer works "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-28 14:56 -0700
                Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-28 15:41 -0700
                Re: function declaration without args no longer works Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-29 21:20 +0000
                Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-04-28 17:14 +0200
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-28 17:31 +0200
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-28 19:06 +0000
                Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-28 21:44 +0200
                Re: function declaration without args no longer works Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2026-04-28 17:06 +0200
                Re: function declaration without args no longer works cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-28 19:23 +0000
  Re: function declaration without args no longer works David Brown <david.brown@hesbynett.no> - 2026-04-26 17:35 +0200
    Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-26 16:50 +0000
    Re: function declaration without args no longer works Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-04-26 15:52 -0700
  Re: function declaration without args no longer works Andrey Tarasevich <noone@noone.net> - 2026-04-26 08:38 -0700
    Re: function declaration without args no longer works John Forkosh <forkosh@panix.com> - 2026-04-26 16:56 +0000

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