Visual Studio 16.4 vs 16.5

[steven-johnson]

The current Windows VMs appear to have VS 16.4 installed; unfortunately, this version is known to be incompatible with LLVM; attempting to build LLVM with it fails with Host Visual Studio version 16.4 is known to miscompile part of LLVM, please use clang-cl or upgrade to 16.5 or above (use -DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON to ignore).

While the workaround above is obvious, it’s also a problem (the error is there for a reason). Is there a plan/timetable to upgrade the VMs to VS 16.5?

(For more info, see: https://developercommunity.visualstudio.com/content/problem/845933/miscompile-boolean-condition-deduced-to-be-always.html)

[Yanjingzhu]

Hi steven-johnson, 

I checked visual studio 16.5, it is still in preview version. https://docs.microsoft.com/en-us/visualstudio/releases/2019/release-notes-preview 

When a stable version of VS16.5 published, the Hosted runner on windows vm will update to use it . But I am not sure the timetable for it. As a temporary work around , you could consider using self-hosted runner with suitable VS version . 

[alexreinking]

For some context, this is a discussion on Visual Studio’s product forums about the bug: https://developercommunity.visualstudio.com/content/problem/845933/miscompile-boolean-condition-deduced-to-be-always.html