Keeping file hierarchy across subdirectories in CMake

Question

Till date I still do not really understand what the \'best practice\' is for doing this for a CMake project with many subdirectories.

Say I have a project hierarchy

Answer 1

In your case there's no need to use add_subdirectory since you have only one target which is created in the root CMakeLists.txt. You can simply write this:

add_executable(myProg
    SubD1/Source.cpp
    SubD1/SubSubD1/Source2.cpp)

Use add_subdirectory for subdirectories creating their own targets so there's no information to pass upwards.