[Bug libstdc++/78747] Duplicate _S_empty_rep_storage causes crash when STV_HIDDEN

[jengelh at inai dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78747

--- Comment #3 from Jan Engelhardt <jengelh at inai dot de> ---
The workaround is

global { extern "C++" { *::_Rep::_S_empty_rep_storage; }}

but of course that was not the question embedded in this "bug" report.