Compiling multithread code with g++

I have the easiest code ever:

#include <iostream>
#include <thread>

void worker()
    std::cout << "another thread";

int main()
    std::thread t(worker);
    std::cout << "main thread" << std::endl;
    return 0;

though I still cannot compile it with g++ to run.

More details:

$ g++ --version
g++ (Ubuntu/Linaro 4.8.1-10ubuntu8) 4.8.1
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO

Command to compile:

$ g++ main.cpp -o main.out -pthread -std=c++11


$ ./main.out 
terminate called after throwing an instance of 'std::system_error'
  what():  Enable multithreading to use std::thread: Operation not permitted
Aborted (core dumped)

And now I’m in stuck. In every related thread over the internet it’s recommended to add -pthread while I have it already.

What am I doing wrong?

PS: It’s a brand new ubuntu 13.10 installation. Only g++ package was installed and minor things like chromium etc


$ ldd ./a.out => (0x00007fff29fc1000) => /usr/lib/x86_64-linux-gnu/ (0x00007fb85397d000) => /lib/x86_64-linux-gnu/ (0x00007fb853767000) => /lib/x86_64-linux-gnu/ (0x00007fb85339e000) => /lib/x86_64-linux-gnu/ (0x00007fb85309a000) 
/lib64/ (0x00007fb853c96000)

PPPS: with clang++ (v3.2) it compiles and runs fine

PPPPS: guys, it’s not a duplicate of What is wrong with this use of std::thread?


$ dpkg --get-selections | grep 'libc.*dev'
libc-dev-bin                    install
libc6-dev:amd64                 install
libclang-common-dev             install
linux-libc-dev:amd64                install

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The answer was provided by a kind member of SO C++ chat.

It looks like this behaviour is caused by a bug in gcc:

The workaround provided in the last comment of that bug discussion does work and solves the issue:


Adding ‘-lpthread’ fixed identical problem for me: “g++ -std=c++11 foo.cpp -lpthread -o foo”.

answer already was made for qtcreator:

LIBS += -pthread
QMAKE_CXXFLAGS += -pthread
QMAKE_CXXFLAGS += -std=c++11

for console g++: here

g++ -c main.cpp -pthread -std=c++11         // generate target object file
g++ main.o -o main.out -pthread -std=c++11  // link to target binary

I have slightly more advanced version (4.8.4 instead of 4.8.1), and I tested all three answers above. In fact:

-pthread alone works:

g++ -std=c++11 -o main -pthread main.cpp

-Wl,–no-as-needed alone does not work.

-lpthread alone does not work.

-Wl,–no-as-needed and -lpthread together work:

g++ -std=c++11 -o main -Wl,–no-as-needed main.cpp -lpthread

My version is “g++ (Ubuntu 4.8.4-2ubuntu1~14.04.1) 4.8.4”.