Comment by ethin

E.g.: referencing a vcpkg-built package (without pkgconfig because not all packages have those files). Or telling SPM "Hey, I have this package which uses the cmake build system, and I want you to link to it and auto-generate module maps for it, and get the include directories from cmake". Things like that. So for me anyway it makes using swift painful. The same thing goes in reverse: using SPM packages from cmake (although this is more a cmake issue).