X-Recipient: archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status: No, hits=-0.8 required=5.0	tests=AWL,BAYES_00,SPF_NEUTRAL
X-Spam-Check-By: sourceware.org
Message-ID: <4E4BD899.4070409@cs.utoronto.ca>
Date: Wed, 17 Aug 2011 11:04:57 -0400
From: Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20110624 Thunderbird/5.0
MIME-Version: 1.0
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: v*printf functions not available with g++ -std=c++0x
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes
Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id: <cygwin.cygwin.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

Hi all,

I'm using the experimental gcc-4.5 package and hit a strange error: 
c++0x mode suppresses the definition of the v*printf() family of 
functions in stdio.h in c++0x mode. The offending code seems to be:

#if !defined(__STRICT_ANSI__) || (__STDC_VERSION__ >= 199901L)
#ifndef _REENT_ONLY
...
int     _EXFUN(vsnprintf, (char *, size_t, const char *, __VALIST)
                _ATTRIBUTE ((__format__ (__printf__, 3, 0))));
...
#endif
#endif

Running `g++ -std=c++0x -dM -E' indicates that __STRICT_ANSI__  is 
defined while _REENT_ONLY and __STDC_VERSION__ are not.

Oddly, functions like _vsnprintf_r are still available for some strange 
reason (aren't they extensions?). I hope this is a bug rather than a 
requirement of the new standard; meanwhile, using std=gnu++0x works 
around the problem.

Ryan


--
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