Thread in C++ in MacOS X

Question

I'm trying to run some code using threads in standard C++ (installed with XCode) in MacOS X Mavericks. But I'm getting some errors. Here's a minimal working example:

#include <thread>
#include <iostream>

void run (int x) {
    std::cout<<".";
}

int main (int argc, char const *argv[])
{
    std::thread t(run);
}

The error I'm getting:

minimal.cpp:10:17: error: no matching constructor for initialization of 'std::thread'
std::thread t(run,0);
            ^ ~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/thread:372:9: note: candidate constructor template not viable: requires single argument '__f', but 2 arguments
  were provided
thread::thread(_Fp __f)
    ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/thread:261:5: note: candidate constructor not viable: requires 1 argument, but 2 were provided
thread(const thread&);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/thread:268:5: note: candidate constructor not viable: requires 0 arguments, but 2 were provided
thread() _NOEXCEPT : __t_(0) {}
^
1 error generated.

I've been able to track the problem to my compiler defining _LIBCPP_HAS_NO_VARIADICS, which is defined because of

#if !(__has_feature(cxx_variadic_templates))
#define _LIBCPP_HAS_NO_VARIADICS
#endif

Any help would be appreciated.

Thank you!

Solution

Thanks to pwny and PeterT, I figured out the error.

I just needed to compile with clang++ -std=c++11 minimal.cpp and it worked like a charm. I also needed a t.join() at the end to prevent an execution error to happen.

Comments

[anthonyvd]

What command line arguments are you passing to clang?

[spalac24]

I'm compiling with g++, I only do g++ minimal.cpp. clang++ minimal.cpp also fails.

[anthonyvd]

add --std=c++11 and see if it helps

[spalac24]

It does help in the compiling, but running gives me libc++abi.dylib: terminating .Abort trap: 6

[anthonyvd]

that's probably a different issue. Try running it through gdb and see where it breaks.

[PeterT]

@user3267581 try adding t.join(); at the end of main

[spalac24]

Yep, that did it. I just needed to add a t.join(). Thank you very much. I'd like to give you an accepted answer, but as this is a comment... Let me know if I should answer myself. (So if this happens to anyone else they will know)

[PeterT]

@user3267581 just answer yourself

[vforvendetta]

Thanks for the clang tip. The default g++ doesn't work.

[Fisher Coder]

How can we use g++ in this case? I know clang++ -std=c++11 works for me as well.