Hi Daniel, Back in r197485 you made it so that missing module headers are marked unavailable and will fail at build/import time rather than when parsing the module map file. This patch fixes the case where a submodule is missing a header - right now the top-level module will build without the header, which is awful, because 1) you don’t get a diagnostic for the missing header and may just get missing symbols, and 2) even after you replace the missing header the module won’t rebuild because the pcm file doesn’t depend on that header if it wasn’t included.
I’m not sure if I did this the right way, since it seems like the MissingHeader should be on the submodule, but I wasn’t sure if we wanted to search all of a module’s children in order to figure out what happened. Ben
missing.patch
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