[clipper2] Support for Windows (remove pkgconfig dependency) about vcpkg

[Neumann-A]

On Windows, PkgConfig is not installed by default, and is - as far as I know - impossible to integrate to ninja (the default build tool for Visual Studio and Visual Studio Code). Therefore Cmake throws an error that PkgConfig is not found.

Your knowledge is wrong. Simply depend on port pkgconf cmake should then find pkgconf unless or HOST and TARGET_TRIPLET are different which just requires setting VCPKG_USE_HOST_TOOLS to ON

[szakeetm]

Thank you. I didn't know that PkgConfig can be fulfilled by the port pkgconf
I tested and it builds now on Windows.
May I then suggest to add pkgconf as a dependency of the clipper2 port? Would it maybe break something on non-Windows platforms?

[Neumann-A]

May I then suggest to add pkgconf as a dependency of the clipper2 port?

It is simply not a dependency of clipper2. It is a dependency for downstream users who want to use clipper via pkg-config. Alternative you could write a FindClipper2.cmake module which uses find_library.

Would it maybe break something on non-Windows platforms?

Using manifest mode you can make the dependency on pkgconf platform dependent.

[szakeetm]

Thank you, I close the issue.

[dg0yt]

PkgConfig is ... impossible to integrate to ninja (the default build tool for Visual Studio and Visual Studio Code).

CMake's FindPkgConfig.cmake is not prepared for multi-config generators.