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v*printf functions not available with g++ -std=c++0x
- From: Ryan Johnson <ryan dot johnson at cs dot utoronto dot ca>
- To: "cygwin at cygwin dot com" <cygwin at cygwin dot com>
- Date: Wed, 17 Aug 2011 11:04:57 -0400
- Subject: v*printf functions not available with g++ -std=c++0x
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
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