[Bug libstdc++/66030] [5.1.0] std::codecvt_byname missing from libstdc++ DLL

[sailer at sailer dot dynip.lugs.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66030

--- Comment #1 from Thomas Sailer <sailer at sailer dot dynip.lugs.ch> ---
Created attachment 35471
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35471&action=edit
preprocessed testcase