rnk added a comment. It should be possible to make retain work on COFF for internal linkage things by emitting a non-comdat section, even when /Gy / -ffunction/data-sections are enabled. That's complicated if the thing being retained is in a comdat group, but I think it's doable. If the group is being retained and the leader is internal, then all of the sections in the group should be retained by GC, and none of them need to be marked comdat, and they won't participate in GC.
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