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Okay, I am trying it, but it does not exactly work out of the box. Do you remember how you got a hand on the MSVC libraries? I use https://github.com/mstorsjo/msvc-wine to download the MSVC toolchain using python, and then I simply wget this file https://raw.githubusercontent.com/llvm/llvm-project/main/llvm/cmake/platforms/WinMsvc.cmake, and call CMake like in the example the file has as a comment in the first few lines. I installed clang-tools-15 and lld-15 using apt. Does this sound somehow correct? I set all the paths correctly and I get a CMake Error "include could not find requested file: [...] //ClangClCMakeCompileRules.cmake", the error occurs while CMake is testing the C compiler if it works.
Option 1: Build everything using GCC in ubuntu-latest and MSVC in windows-latest. It might work well, but you are tied to using GH Actions, the actions also cannot be run locally using something like [act](https://github.com/nektos/act), and every build script must be written multiple times for Bash and Batch. You are basically tied to just the runner itself and everything outside of that you're f*cked. This solution is really ugly and I want to circumvent it.
My Windows build is here https://github.com/NCCA/NGL/blob/main/.github/workflows/windows.yml I use vcpkg for installing 3rd party libs and the msvc-dev command from here https://github.com/ilammy/msvc-dev-cmd
My Windows build is here https://github.com/NCCA/NGL/blob/main/.github/workflows/windows.yml I use vcpkg for installing 3rd party libs and the msvc-dev command from here https://github.com/ilammy/msvc-dev-cmd
Been working well, recently setup another set of boiler plate code for Mac, Windows and Linux here as well https://github.com/NCCA/NCCABoilerplate/tree/main/.github/workflows
As for using that combination on non-Windows hosts, I think LLVM's WinMsvc.cmake might help quite a bit - given paths to Windows libs/headers and an LLVM install, it sets up cross-compilation fairly painlessly. Given the size and/or prominence of LLVM, I think it's arguably fairly well-supported and probably not likely to break any time soon.
There is also (community-maintained) GH Actions support. I don't believe there is integration for binary distribution package generation/upload, but I am sure it shouldn't be that difficult to add (all the underlying command are described in the first link I gave you): https://github.com/build2/setup-build2-github-action
If i understand this writing correctly (https://github.com/actions/runner/issues/904), running Windows containers in a windows-latest GH Actions host is not possible. While using a self-hosted runner on a Windows server might be an option, this is not what I want since it is a package repo for a well-known open source project, think of the package repo part as a mini-Conan. I wouldn't know who would want to host that. In the best case we would stay with just GH Actions to keep everything confined in one space :)