What are the correct link options to use std::thread in GCC under linux?
C++MultithreadingG++C++11C++ Problem Overview
Hi I am trying to use std::thread
with G++. Here is my test code
#include <thread>
#include <iostream>
int main(int, char **){
std::thread tt([](){ std::cout<<"Thread!"<<std::endl; });
tt.join();
}
It compiles, but when I try to run it the result is:
terminate called after throwing an instance of 'std::system_error'
what(): Operation not permitted
Aborted
My compiler version:
$ g++ --version
g++ (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1
Copyright (C) 2011 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.
What is wrong with my test code?
UPDATE: I use the following command line to compile and run my code.
$ g++ -std=c++0x test.cpp
$ ./a.out
and I tried
$ g++ -std=c++0x -lpthread test.cpp
$ ./a.out
still the same.
C++ Solutions
Solution 1 - C++
I think on Linux pthread is used to implement std::thread
so you need to specify the -pthread
compiler option.
As this is a linking option, this compiler option need to be AFTER the source files:
$ g++ -std=c++0x test.cpp -pthread
Solution 2 - C++
In addition to using -std=c++0x
and -pthread
you must not use -static
.
Solution 3 - C++
-std=c++11 -static -pthread -Wl,--whole-archive -lpthread -Wl,--no-whole-archive
works together with -static
!!!
See here: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52590#c4
Solution 4 - C++
Here's a simple CMake file for compiling a C++11 program that uses threads:
CMakeLists.txt:
cmake_minimum_required(VERSION 2.8)
list(APPEND CMAKE_CXX_FLAGS "-pthread -std=c++11 ${CMAKE_CXX_FLAGS}")
add_executable(main main.cpp)
One way of building it is:
mkdir -p build
cd build
cmake .. && make
Solution 5 - C++
Try compiling this way in single command:
g++ your_prog.cpp -o your_output_binary -lpthread -std=gnu++11
You can also try C++11 instead of gnu++11. Hope this works.