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


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

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jouni Roivas from comment #3)
> Created attachment 35668 [details]
> proposed patch
> 
> This patch solves this problem for me. However I'm not sure if it covers all
> the cases.

This is wrong because it adds the symbols to a frozen symbol version, we need a
new symbol version.

What I don't understand is why the symbols are only missing now, when they've
never been correctly exported, even prior to GCC 5.


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