[PATCH] D129607: [clang][deps] Fix handling of -MT in module command-line

[Ben Langmuir via Phabricator via cfe-commits]

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Follow-up to 6626f6fec3d3 <https://reviews.llvm.org/rG6626f6fec3d37b78b628b858bdadbbb8301e1a2f>, this fixes the handling of `-MT`

- If no targets are provided, we need to invent one since `cc1` expects the driver to have handled it. The default is to use `-o`, quoting as necessary for a make target.
- Fix the splitting for empty string, which was incorrectly treated as `{""}` instead of `{}`.
- Add a way to test this behaviour in clang-scan-deps.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D129607

Files:
  clang/include/clang/Basic/MakeSupport.h
  clang/include/clang/Tooling/DependencyScanning/ModuleDepCollector.h
  clang/lib/Basic/CMakeLists.txt
  clang/lib/Basic/MakeSupport.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
  clang/test/ClangScanDeps/generate-modules-path-args.c
  clang/tools/clang-scan-deps/ClangScanDeps.cpp

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