[Bug lto/82172] Destruction of basic_string in basic_stringbuf::overflow with _GLIBCXX_USE_CXX11_ABI=0, -flto, and C++17 mode results in invalid delete

[dave.gittins at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82172

--- Comment #27 from Gubbins <dave.gittins at gmail dot com> ---
> Dave, the fix for PR 86138 might also fix this case for Darwin - could you
> check that please?

I can confirm that using my homebrew-installed gcc 8.2.0 package on OSX, the
issue no longer occurs. I don't know if the change made for PR 86138 is
responsible but I believe 8.2.0 was the first release to include it.