Fangrui Song 91d8324366 [MinGW] Reject explicit non-default visibility applied to dllexport/dllimport declaration ...

dllimport/dllexport is incompatible with protected/hidden visibilities.
(Arguably dllexport semantics is compatible with protected but let's reject the
combo for simplicity.)

When an explicit visibility attribute applies on a dllexport/dllimport
declaration, report a Frontend error (Sema does not compute visibility).

Reviewed By: mstorsjo

Differential Revision: https://reviews.llvm.org/D133266

2022-09-05 10:17:19 -07:00

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