[CMake] Out of source dependencies.

[Schwartz, Philip]

The current project that I am working on has multiple projects layered through subdirectories. The project was a conversion from traditional makefiles and when we do a cmake build from the root of the source tree all is done correctly. The issue comes to when we try and build a single component from a out of source build directory (we are requiring out of source builds).

I have found a temp solution for example

/trunk/a
/trunk/b
/trunk/c


a requires b and b requires c to build correctly. As long as they dont share dependencies, if I use add_subdirectory(src ${CMAKE_BINARY_DIR}/<project>) for each it works to build the deps as needed. The issue is if both a and c require the another dep pulled in the same way. The error that comes up is through a policy error of CMP0013.

Yes, I could disable the policy, but would prefer a more elegant solution for the issue. Any help would be appreciated.

--Philip

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