Hunter Dependencies with Git Submodule #511

• I've read Brief overview section and do understand basic concepts. [Yes]
• I've read F.A.Q. section and there is no solution to my problem there. [Yes]
• I've read Code of Conduct, I promise to be polite and will do my best at being constructive. [Yes]
• I've read Reporting bugs section carefully. [Yes]
• I've checked that all the hunter_add_package/find_package API used by me in the example is the same as in documentation. [Yes]
• I'm using latest Hunter URL/SHA1. [Yes]

Hunter currently cannot handle dependencies that need git submodules to build. The problem is that

1. Ordinary GitHub .tar.gz archives will not contain the submodule contents.
2. hunter_config(... GIT_SUBMODULE ...) will not package the submodule content and thus compilation will fail (missing files).

Example Repository: https://github.com/image357/cmake_tutorial

If you try to include this repository in any other repository via Hunter, it will fail. The reason is that both submodules (lib/HunterGate and tests/lib/googletest) will not be present at compile time.

This is unfortunate, since a dependency, which itself used hunter_config(... GIT_SUBMODULE ...) will not be compatible with Hunter (i.e. git submodule resursive hunter dependencies are not possible).