https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86138
--- Comment #12 from Christian Franke <franke at computer dot org> --- (In reply to Jonathan Wakely from comment #7) > OK, so then this is the whack Windows linker model, where every DLL has its > own address space, and probably the same as PR 81522. Yes. Likely also affects MinGW libstdc++6.dll. > Does Cygwin default to _GLIBCXX_USE_CXX11_ABI=0? Yes. Possible fix for Cygwin: - Rebuild cygstdc++6.dll with C++17 enabled - Disable/Remove '__cplusplus <= 201402L' condition around the extern template block in this case.
