Re: Why does 'gcc -Wall' complain about void main() ?

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From	Keith Thompson <kst-u@mib.org>
Newsgroups	comp.lang.c
Subject	Re: Why does 'gcc -Wall' complain about void main() ?
Date	Fri, 01 Nov 2019 10:31:08 -0700
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Manfred <noname@add.invalid> writes:
> On 11/1/2019 3:45 PM, David Brown wrote:
>> On 01/11/2019 15:22, DFS wrote:
>>> gcc 9.1.0 on MSYS2
>>>
>>> combinearrays.c:14:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
>>>     14 | void main() {
>>>        |      ^~~~
>>>
>> 
>> That is because the main should be declared as either:
>> 
>> 	int main(void);
>> 
>> 	int main(int argc, char *argv[]);
>> 
>> or an implementation-specific extension (*nix systems often allow a
>> third "envp" pointer).
>
> And version 0.01 of the linux kernel had:
>
> void main(void)      /* This really IS void, no error here. */
> {                    /* The startup routine assumes (well, ...) this */

The kernel is considered to be in a freestanding environment, in
which the program's entry point is entirely implementation-defined.
For hosted environments, main returns int (or possibly some
implementation-defined type, but that's rarely if ever useful).

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for Philips Healthcare
void Void(void) { Void(); } /* The recursive call of the void */

Thread

Why does 'gcc -Wall' complain about void main() ? DFS <nospam@dfs.com> - 2019-11-01 10:22 -0400
  Re: Why does 'gcc -Wall' complain about void main() ? David Brown <david.brown@hesbynett.no> - 2019-11-01 15:45 +0100
    Re: Why does 'gcc -Wall' complain about void main() ? Manfred <noname@add.invalid> - 2019-11-01 17:57 +0100
      Re: Why does 'gcc -Wall' complain about void main() ? Keith Thompson <kst-u@mib.org> - 2019-11-01 10:31 -0700
        Re: Why does 'gcc -Wall' complain about void main() ? Manfred <noname@add.invalid> - 2019-11-01 21:00 +0100
      Re: Why does 'gcc -Wall' complain about void main() ? David Brown <david.brown@hesbynett.no> - 2019-11-01 21:20 +0100
  Re: Why does 'gcc -Wall' complain about void main() ? Keith Thompson <kst-u@mib.org> - 2019-11-01 10:25 -0700

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