Support C++20 Module

[soroshsabz]

ITNOA

I think the C++20 Module is the next era of C++ dependency management. So I think VCPKG need some good integration with it, and port all of its ports to support C++20 Module. and maybe vcpkg can play role like cargo for C++ so I think it is very important to fast decision and good design to make deep integration with C++20 Module.

The good news is CMake 3.20 is support C++20 Module natively (also is experimental still now) and I think we can get help from that.

[soroshsabz]

related to #11177

[PhoebeHui]

@soroshsabz, thanks for bringing this up! we'd perfer to change this to discussion.

[mathisloge]

@soroshsabz unfortunately this is only a first step for cmake to pave the way for modules. There are a big number of missing bits to have a native integration of c++ modules.
See the cmake issue https://gitlab.kitware.com/cmake/cmake/-/issues/18355

[soroshsabz]

@mathisloge you right, but because of merging https://gitlab.kitware.com/cmake/cmake/-/merge_requests/5562 , I think vcpkg can start working on it.

[mathisloge]

What are you expecting vcpkg to do regarding modules?
Libraries, cmake and compilers have to support modules.

For the installation vcpkg normally depends on what the build tools are installing

[kelteseth]

I have created https://arewemodulesyet.org/ to track modules usage. It would be nice if vcpkg itself would provide a list if a port supports modules