On Wed, May 23, 2018 at 09:44:03PM -0400, Brian Groose wrote: > I'm moving from g++ 5.3.0 to 8.1.0 at the moment, and bumped into an > unexpected linker failure on AIX. I don't currently have a small > piece of code that reproduces the issue, but I'm working on narrowing > it down. Hopefully someone can make a suggestion without code, > though. I've build gcc 8.1.0 from source with no special options > except --prefix and --enable-languages=c,c++ > > These are the AIX linker errors using g++ 8.1.0: > ld: 0711-317 ERROR: Undefined symbol: typeinfo for std::thread::_State > ld: 0711-317 ERROR: Undefined symbol: .std::thread::_State::~_State() > ld: 0711-317 ERROR: Undefined symbol: > .std::thread::_M_start_thread(std::unique_ptr<std::thread::_State, > std::default_delete<std::thread::_State> >, void (*)()) > ld: 0711-317 ERROR: Undefined symbol: vtable for std::thread::_State > > This worked fine, the same code, on g++ 5.3.0. > > This looks similar to > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52887 except for > std::thread. It seems to happen when std::thread is used to call a > member function, though a simple test case worked fine. > > Thanks! Hello Brian I think that you need to compile with -pthread switch as well as linking with -pthread. The order of switches is important when linking, I think that I got joy with putting -lpthread last in the link list. I do not have detailed knowledge to hand, but these are my memories of working with threaded code on AIX. Not version 8.1 though. Bob -- You have the capacity to learn from mistakes. You'll learn a lot today.
