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Date: Mon, 13 Apr 2009 02:20:45 +0000
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Subject: Re: cygwin1.7, g++ 4.3.2 (with -std=c++0x) and undefined references   to  snprintf()
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On 2009-04-13 00:34Z, Brian and Victoria wrote:
> Brian and Victoria wrote:
>> I've exhausted my google-fu and am hoping someone on the list has 
>> superior powers...
>>
>> I'm on the bleeding edge, using cygwin 1.7 and g++ 4.3.2 with 
>> -std=c++0x (enables C++0x experimental features, and access to 
>> variadic template parameters in my case).
>>
>> Prior to switching on c++0x, there were no problems.  Afterwards 
>> though, the linker (via g++) complains about undefined references to 
>> snprintf().  I'm linking with "stdc++", and tried also linking with 
>> "c" (C99 library) as well, but no luck.  Anyone else running into this?
>>
>> I've got a build in progress with -std=gnu++0x instead (GNU dialect of 
>> the experimental C++0x features), and will see how that goes.
>
> This has resolved the problem, so something may be amiss with the 
> standard dialect or there's something forgiving about the GNU dialect.

The snprintf() family was added to C in C99. It's not in the 2003 C++
standard, but it is in N2857, the C++0x draft as of 2009-03-23. Still,
gcc's current C++0x support is experimental:
  http://gcc.gnu.org/projects/cxx0x.html
so it doesn't seem alarming that the more forgiving '-std=gnu++0x' is
needed today in this case.

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