[PATCH] D114639: Raise the minimum Visual Studio version to VS2019

[Simon Pilgrim via Phabricator via cfe-commits]

RKSimon created this revision.
RKSimon added reviewers: rnk, aaron.ballman, zturner, jhenderson, Meinersbur, jansvoboda11, gbedwell.
Herald added subscribers: dexonsmith, mstorsjo, mgorny.
RKSimon requested review of this revision.
Herald added projects: clang, LLVM.
Herald added a subscriber: cfe-commits.

As raised here: https://lists.llvm.org/pipermail/llvm-dev/2021-November/153881.html

Now that VS2022 is on general release, LLVM is expected to build on VS2017, VS2019 and VS2022, which is proving hazardous to maintain due to changes in behaviour including preprocessor and constexpr changes. Plus of the few developers that work with VS, many have already moved to VS2019/22.

This patch proposes to raise the minimum supported version to VS2019 (16.x) - I've made the hard limit 16.0 or later, with the soft limit 16.11 (VS2019 latest) - older versions os VS2019 are "allowed" (at your own risk) via the LLVM_FORCE_USE_OLD_TOOLCHAIN cmake flag.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D114639

Files:
  clang/docs/ClangFormatStyleOptions.rst
  clang/docs/UsersManual.rst
  llvm/cmake/modules/CheckCompilerVersion.cmake
  llvm/docs/CMake.rst
  llvm/docs/GettingStarted.rst
  llvm/docs/GettingStartedVS.rst
  llvm/docs/ReleaseNotes.rst
  llvm/include/llvm/Support/Compiler.h

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