I have recently started using git submodules in my projects. I have had multiple complains from my users "It gives me a "missing xyz.h" type of error when I try to compile." The reason is that they haven't initialized the submodules (like it says to do in the readme :) ). Is there a CMake way to check if a submodule is initialized so I can throw a more appropriate error - "Please initialize the xyz submodule" instead of letting the error get all the way to the compiler?
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