Ben Boeckel 7b05724ac8 cmCxxModuleMapper: give transitive usages to Clang as well ...

In the future, Clang plans to require transitive module usage to be
specified on the command line. This is in order to keep BMI files more
reproducible. Handily, MSVC has already required this, so the logic can
be reused for Clang easily.

See: e22fa1d4c6
See: https://github.com/llvm/llvm-project/issues/62707
See: https://discourse.llvm.org/t/c-20-modules-should-the-bmis-contain-paths-to-their-dependent-bmis/70422

2023-07-13 08:40:22 -04:00

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