v*printf functions not available with g++ -std=c++0x

Ryan Johnson ryan.johnson@cs.utoronto.ca
Wed Aug 17 15:05:00 GMT 2011

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))));

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.


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