[Bug libstdc++/60662] simple use of call_once throws a system_error exception, but not if sleep_for is called beforehand

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60662

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
-lpthread (or more correctly, -pthread) should cause the executable to link to
libpthread.so for pthread_once, but for some reason on your system is
preferring the weak pthread_once symbol found in libc.so and so your executable
is not linked to libpthread.so

I do not think that is a GCC problem.