That's NOT what add_subdirectory is made for. It is intended for adding a sub-directory in the source tree. So, if your directory structure looks like this (i.e. B is a sub-project of A)

A/CMakeLists.txt
A/B/CMakeLists.txt

things are simple:

A/CMakeLists.txt:

Actually add_subdirectory does support the notion of out-of-source source. So, a source directory in does not have to be a direct sub-directory on disk.

-Bill
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