Hi Bob, Yes, I have -pthread, in fact, it won't even compile (much less try to link) because the declaration isn't visible without -pthread. I verified that the linker is looking at the pthread version of libstdc++.a as well, which shows the type "L" AIX TLS symbols when I run nm on it. I've tried compiling gcc without and without --enable-tls, which doesn't seem to make any difference. On Mon, Oct 30, 2017 at 6:55 AM, Bob Wilkinson <bob.wilkinson@xxxxxxxxxxx> wrote: > On Sun, Oct 29, 2017 at 12:14:59PM -0400, 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 > > > > Thanks! > > Hello Brian > > Do you have the flag '-pthread' set while compiling? > > Bob >
