On 29 October 2017 at 16:14, Brian Groose wrote: > I'm hitting what looks like pr67478 (which is fixed by pr 68192). > > The example in PR67478 fails with the same error. However, I'm running g++ > 5.3.0, so the issue should be fixed with my compiler. > > I can see the symbols in libstdc++.a as type L as expected. > > Do I need to compile g++ with some special option for this? > > TLS using the thread_local keyword works fine, it's just that the linker > can't seem to find the symbols for call once: > ld: 0711-317 ERROR: Undefined symbol: std::__once_callable > ld: 0711-317 ERROR: Undefined symbol: std::__once_call > ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more > information. > collect2: error: ld returned 8 exit status Those symbols don't use thread_local, they use __thread, which isn't necessarily implemented the same way. Does using __thread for thread-local variables work?
