[CMake] Build cmake child project from cmake parent project

[Aaron Boxer]

I have cmake two projects, with project 2 added as a git submodule in
project 1.

I would like to build project 2 from project 1.

How can I do this? I tried add_subdirectory, but this is just for adding
source directories. I want to use the project 2 cmake files to build it.

Thanks!
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