X-Recipient:	archive-cygwin AT delorie DOT com
X-Spam-Check-By:	sourceware.org
Date:	Mon, 10 Oct 2011 11:21:12 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: stdio.h: broken standard compliance.
Message-ID:	<20111010092112.GA28134@calimero.vinschen.de>
Reply-To:	cygwin AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
References:	<011d066ef0c80ba22bccc432fbc1b5fc AT 127 DOT 0 DOT 0 DOT 1> <be85065e5a355059f429f59dfec6271c AT 127 DOT 0 DOT 0 DOT 1>
MIME-Version:	1.0
In-Reply-To:	<be85065e5a355059f429f59dfec6271c@127.0.0.1>
User-Agent:	Mutt/1.5.21 (2010-09-15)
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Unsubscribe:	<mailto:cygwin-unsubscribe-archive-cygwin=delorie DOT com AT cygwin DOT com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com

On Oct  9 11:23, Kaz Kylheku wrote:
> 
> On Sun, 09 Oct 2011 11:08:58 -0700, Kaz Kylheku <kaz AT kylheku DOT com>
> wrote:
> > reason, I cannot get a warning about fileno from this test case if
> > I add a reference to it. I will try to produce a minimal repro test
> > case for that.
> 
> In my real program I have -Wall, and I'm not taking the function
> pointers.
> 
> With -Wall we get warnings about implicit declarations.
> 
> So, here is a better test case which shows that these identifiers are
> not declared when they should be. Of course the two errors occur
> without -Wall.
> 
> $ cat posix-ansi.c
> #include <stdio.h>
> 
> void foo(void)
> {
>   int (*f1)(FILE *) = fileno;
>   int (*f2)(FILE *) = pclose;
> }
> 
> int main(void)
> {
>   int x = fileno(stdin);
>   pclose(NULL);
>   return 0;
> }
> 
> $ gcc -Wall -ansi -D_POSIX_C_SOURCE=2 posix-ansi.c
              ^^^^^
fileno and pclose are *not* ANSI functions.  Therefore, if you define
-ansi, you get the below errors.  The newlib headers have explicit
#ifndef __STRICT_ANSI__ guards around the non-ANSI definitions.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -