[CMake] add_subdirectory and build directory

[Pierre-Julien Villoud]

Hi everyone,

After unsuccessfully looking for an answer on Google, I contact you.
I have a question regarding the use of add_subdirectory. When a project A is depending on a project B, I add the following in A's CMakeLists.txt :

Add_subdirectory(B Path/To/B/Build/Directory)

It does build B before A. But when I build B in its build directory and I build A after, it builds B again whereas it should not since B is up to date.

Anyone sees what's wrong ?

Thanks in advance

Pierre-Julien VILLOUD
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