What is the required VS2017 version?

[marczellm]

The only indication of what VS version is compatible with WinObjC is #2884 (comment). The required version should be very prominently displayed in the readme. A VS installation is very long and painful on a slower machine or internet connection.

[Liastre]

I have no troubles with VS 15.4.5-15.8.9 suggest you to stick with some version from range, any 15.9.x has clang version conflicts with latest C++ standard used in windows headers. As @edvv pointed in related topic, Clang/C2 was cutted out from VS, not sure how it's related since WinObjC nu get packages using separate clang compiler included with packages, anyway I've checked on latest VS 2019 preview 1 and preview 2, and yay it's compiles as intended! Hope this issue gone starting from VS 16.x and later. Cheers

P.S.: Be sure you are targeting your project not higher than 10.0.16299.0 platform version, otherwise you get issue I've described above with conflicting clang and windows headers from sdk based on newest C++ standard, it will be fixed in next WinObjC release, when it came out :D