Public bug reported: The following c++11 program works properly (prints fn1 and fn2) on every system and compiler I have checked except for Ubuntu - where it prints (fn2 and fn2). This happens on both laptop and server installs of Ubuntu 18.04.
All system gcc packages on my Ubuntu 18.04 system show the same (incorrect) output: g++-5 (Ubuntu 5.5.0-12ubuntu1) 5.5.0 20171010 g++-6 (Ubuntu 6.5.0-2ubuntu1~18.04) 6.5.0 20181026 g++-7 (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0 g++-8 (Ubuntu 8.3.0-26ubuntu1~18.04) 8.3.0 Notes: - Re-compiling gcc from source eliminates the problem. - I have not checked any Ubuntu versions other than 18.04. Off-topic note: - this may be a [libpthread bug](https://bugs.launchpad.net/ubuntu/+source/libpthread-stubs/)? /* Minimal bug-reproducer for gcc on ubuntu */ #include <functional> #include <thread> #include <stdio.h> struct run { const std::function<void()> &fn; run(const std::function<void()> &fn_) : fn(fn_) {} void operator()() { fn(); } }; int main() { auto fn1 = [](){ printf("fn1\n"); }; auto r1 = run(fn1); auto fn2 = [](){ printf("fn2\n"); }; auto r2 = run(fn2); std::thread t1( r1 ); std::thread t2( r2 ); t1.join(); t2.join(); } ** Affects: gcc-defaults (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1876958 Title: Ubuntu-specific pthread issue To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1876958/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
