[PATCH] Allow modules specified by -fmodule-map-file to shadow implicitly found ones

[Ben Langmuir via cfe-commits]

Hi Richard,

This is an updated patch for allowing -fmodule-map-file to shadow implicitly found modules.  I’ve tried to simplify things by just using the explicitness of the module rather than the original more-general approach.  I’ll make a separate patch for -fmodule-file, which is turning out to be more tricky because we already *silently* shadow any module with the same name when using -fmodule-file.

Ben

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