Add CPack support

[zjyhjqs]

No description provided.

[sum01]

I've only briefly messed with Cpack before, but aren't there quite a few vars that should be set? A lot of things don't seem to have defaults (or not defaults you'd want at least).

I recall that it also required quite a few generator-specific vars (like the dependency variables) be set for some generators (like deb files).

[zjyhjqs]

but aren't there quite a few vars that should be set? A lot of things don't seem to have defaults (or not defaults you'd want at least).

The main variables required by CPack are defaulted from project(), so for a modern CMake project it's generally fine.

You could take a try with my presets:
cmake --workflow --preset "unknown-unknown-clang"
CMakeUserPresets.json

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I recall that it also required quite a few generator-specific vars (like the dependency variables) be set for some generators (like deb files).

For the more commonly used packaging tools, .e.g. zip, tgz, that's not necessary. (Indeed, the mandatary variables for DEB generator have defaults)

[yhirose]

Thanks for your contribution!