[CMake] When should I use add_subdirectory and when ExternalProject?

[Todd Greer]

From one brief use of ExternalProject, I came to the conclusion that it should be used when it makes sense to let CMake handle downloading the project in question, and to otherwise use add_subdirectory. Others with more ExternalProject experience may have greater insight, though.

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Todd Greer
Principal Scientist, Affinegy, Inc.

From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On Behalf Of Ansis Malinš
Sent: Monday, February 4, 2013 2:23 AM
To: cmake
Subject: [CMake] When should I use add_subdirectory and when ExternalProject?

If I have a dependency (e.g. SDL2) that seems to work with add_subdirectory just fine, should I still use ExternalProject_Add instead? Given both ways work, what should I prefer? What are the tradeoffs?
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