[Clang][ScanDeps] Add C API and implement enough to build Foundation.#699

Merged

Bigcheese merged 10 commits intoswiftlang:apple/masterfrom

Bigcheese:scan-deps-apple-master

Feb 4, 2020

Commits on Feb 3, 2020

[clang][clang-scan-deps] Add an experimental C API.
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[libclang] Add clang_Driver_getExternalActionsForCommand_v0
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[Clang][cc1] Add -remove-preceeding-explicit-module-build-incompatible-options
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[Clang][ScanDeps] Actually pass the non path command line modifications.
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[Clang][ScanDeps] Use the module map a module was inferred from for inferred modules.
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[Clang] Temporarily comment out assert.
Bigcheese
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[Clang][cc1] Support -fno-implicit-module-maps in -cc1.
Bigcheese
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[Clang] Allow explicitly building an inferred module.
Bigcheese
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[Clang] Fix the header paths in `clang::Module` for inferred modules.
Bigcheese
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[Clang][ScanDeps] Ignore __inferred_module.map dependency.
Bigcheese
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