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[clang][modules][deps] Parent module maps are affecting
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Authored by jansvoboda11 on Nov 1 2022, 3:00 PM.

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Summary

Currently, the algorithm for gathering affecting module maps includes only those defining modules that include some headers. This is not entirely correct, though. Some module maps might be "importing" module maps for extern submodules. Such parent module maps are affecting - they do change semantics of the compilation. This patch adds parent module maps into the set of affecting module maps.

Depends on D137197.

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