std::mutex

[Amleto]

I was looking at some open source project that I thought was interesting and wanted to compile the code for myself. Unfortunately my visual studio 2010 isn't c++11 compliant enough so I installed gcc/g++ 4.7.2 and that doesn't work either

Here is a snippet that shows my problem.

> g++ --version

g++ (GCC) 4.7.2
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

#include <mutex>

int main()
{
  std::mutex mutex_;

  return 0;
}

>g++ -std=c++11 main.cpp

main.cpp: In function 'int main()':
main.cpp:5:2: error: 'mutex' is not a member of 'std'
main.cpp:5:13: error: expected ';' before 'mutex_'

Any help welcomed.

[dovip]

Hmm..Are you using on Linux?

[Amleto]

no... visual studio doesn't work too well on linux.

[Richard.J]

I only have g++ 4.6.1, but looking at /usr/local/include/c++/4.6.1/mutex it seems that the mutex class is protected by some #defines.
I found a (german) article on the web which mentions that you must have installed the pthread library.

HTH,
Richard