[llvm-dev] [RFC] Raise the minimum Visual Studio version to VS2019

[Michael Kruse via llvm-dev]

By our policy to support the last 2 major versions of VS, this is the
right thing to do. Removing support for old compiler versions lessens
the maintenance burden, e.g. when committing a change that happens to
run a bug/missing feature of VS2017.

If I am not mistaken, the value of the latest VS2019 is 1929, not 1927 [1].

Michael

[1] https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-170

Am Di., 23. Nov. 2021 um 05:56 Uhr schrieb Simon Pilgrim via llvm-dev
<llvm-dev at lists.llvm.org>:
>
> Now that VS2022 is on general release, LLVM is expected to build on
> VS2017, VS2019 and VS2022.
>
> What are people's thoughts on raising the minimum supported version to
> latest VS2019 (_MSC_VER = 1927)? Customarily, we've only specifically
> supported the latest 2 versions of Visual Studio, with older versions
> being "allowed" (at your own risk) via the LLVM_FORCE_USE_OLD_TOOLCHAIN
> cmake flag.
>
> I'm thinking we should either make the switch now, in plenty of time
> before the next release of LLVM, or we postpone it until shortly after
> the release branch is created (which I assume will be early 2022).
>
> For the record, I haven't so far noticed any issues with supporting
> VS2017, VS2019 and VS2022 builds, so at this time I don't consider this
> very urgent, just a general maintenance task - although somebody out
> there may know of specific fixes in VS2019+ that could simplify LLVM
> handling for MSVC etc.
>
> Cheers, Simon.
>
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