[cfe-dev] Marking v-tables used whenever any virtual function is referenced

[Richard Smith]

Hi,

Currently, Clang marks a class's vtable as used (and thus marks as used
and, potentially, instantiates everything within it) whenever any virtual
function in the class is referenced. This seems excessive; is there a
reason why we'd always want the vtable in such circumstances? (Attached is
a patch to remove this behavior, which works fine in my -- fairly limited,
so far -- testing).

Thanks,
Richard
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