Question

I want to execute a following code.

#include <iostream>
#include <thread>

void output() {
    std::cout << "Hello World" << std::endl;
}

int main()
{
    std::thread t(output);
    t.join();

    return 0;
}

I can’t execute it.

Qt Creator outputs
terminate called after throwing an instance of ‘std::system_error’
what(): Operation not permitted

However I can execute on the terminal using the option of -pthread.
Could you tell me how to use the option of -pthread in Qt Creator?

My developing environment is Ubuntu(12.04), g++4.6.3, Qt Creator(2.4.1).

Thank you.

Answer 1

You also need to link against -pthread. If you use g++ main.cpp -std=c++0x -pthread you are doing all that in one step, so it works correctly. To make Qt do the correct things, add the following to your project file:

QMAKE_CXXFLAGS += -std=c++0x -pthread 
LIBS += -pthread