EricWF added a comment.
@rsmith. Sorry, you're right. I didn't notice that we already used
`_LIBCPP_BUILDING_LIBRARY` in libc++abi. I wasn't sure if `_BUILDING_LIBRARY`
changed the linkage or of any symbols, or changed their explicit instantiation.
And, indeed, on Windows there's a problem with DLL import/export macros. I'll
fix and cleanup the usage of `_BUILDING_LIBRARY` in the next couple days.
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