I'm developing a library that works with std::jthread
(new in C++20) using g++ 10.0.1. The library works fine if I compile it using share libraries, but If I compile it with static libraries I got a segmentation fault at the end of the program (thread destructor). I have narrowed down my test case to a simple thread creation and join:
#include <iostream>
#include <thread>
int main(int argc, const char** argv) {
auto t = std::jthread([]() { std::cout << "OK\n"; });
t.join();
return 0;
}
To compile I use:
g++-10 -o test --static -std=c++20 test.cc -lpthread
And running it:
% ./test
zsh: segmentation fault (core dumped) ./test
There any one has an idea what this problem could be?
Update:
Following @JérômeRichard suggested reference, I was able to compile and run my little test program without problem
g++-10 -o test --static -std=c++20 test.cc -lrt -pthread -Wl,--whole-archive -lpthread -Wl,--no-whole-archive
However, changing the code to use request_stop
instead of join
the program is segmenting fault again (https://godbolt.org/z/obGN8Y).
#include <iostream>
#include <thread>
int main() {
auto t = std::jthread([]{ std::cout << "OK" << std::endl; });
t.request_stop();
}
The problem was reported to libstdc++ (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95989) and a patch has been generated to solve the problem.