[Mingw-users] multiple definitions of 'vsnprintf'

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Keith Marshall keith****@users*****
Sat Aug 3 03:22:47 JST 2019

On 31/07/19 19:36, Laura Yindra wrote:
> I am getting the error:
>  libmingwex.a(vsnprintf.o):(.text+0x0): multiple definition of
> 'vsnprintf'; main.cpp:(.text$vsnprintf[_nsvprintf]+0x0): first defined
> here collect2.exe: error: ld returned 1 exit status

Thank you for bringing this to my attention.  I can confirm that there
is a reproducible problem here; however ...

> the contents of main.cpp are
> #include <string>
> #include <iostream>
> int main(void)
> {
>     std::cout << "Hello World. "<<std::to_string(1)<<std::endl;
>     return 0;
> }
> the command I am executing in msys.bat is
> g++ -std=c++11 main.cpp
> I only get this error when mingw32-gcc-g++ version is 8.2.0-4
> This error is not in mingw32-gcc-g++ version 6.3.0-1 

... the GCC version is not pertinent.  Yes, like you, I see the problem
when compiling your test case with GCC-8.2.0, and (initially) I do not
see it with either GCC-6.3.0 or GCC-7.3.0, but only because the mingwrt
versions associated with each of those earlier GCC versions were 5.1.0,
and 5.1.1 respectively; if I associate mingwrt-5.2.2, (or at least the
updated version of <stdio.h> from mingwrt-5.2.2), with each of those two
earlier GCC installations, I see the same issue propagate to all three!

The actual cause of the issue is that the changes to <stdio.h>, to
resolve https://osdn.net/projects/mingw/ticket/39224, cause g++ to emit
multiple publicly visible instances of vsnprintf(), each of which refers
to an extern implementation of __mingw_vsnprintf(), and conflicts with
its publicly visible vsprintf() alias, within the translation unit in
which __mingw_vsnprintf() itself is implemented.

The attached patch should correct this; please file a formal bug report,
at https://osdn.net/ticket/newticket.php?group_id=3917, against which I
may apply it.


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