[PATCH] D145517: MSVC: support version preference with search

[Saleem Abdulrasool via Phabricator via cfe-commits]

compnerd created this revision.
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Extend the logic for the WinSDK and UCRT handling to prefer a user
specified version of the VisualC++ tools and Windows SDK.  This allows
us to now perform the regular search for the installation but select the
exact version of the SDK or VC++ tools to override the latest version.
Similar to the other flags controlling this behaviour, if the user
specifies a value, we will not perform validation on the input and will
attempt to prefer that, particularly in the case of VisualC++ tools
where no fallback occurs.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D145517

Files:
  clang/lib/Driver/ToolChains/MSVC.cpp
  lld/COFF/Driver.cpp
  llvm/include/llvm/WindowsDriver/MSVCPaths.h
  llvm/lib/ExecutionEngine/Orc/COFFVCRuntimeSupport.cpp
  llvm/lib/WindowsDriver/MSVCPaths.cpp

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