[CMake] What's the difference of CMAKE_SOURCE_DIR, PROJECT_SOURCE_DIR and project_SOURCE_DIR?

[Clark J. Wang]

For PROJECT(project), what's the difference between CMAKE_SOURCE_DIR,
PROJECT_SOURCE_DIR and project_SOURCE_DIR? And XXX_BINARY_DIR?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://public.kitware.com/pipermail/cmake/attachments/20070522/4bc1dd4e/attachment.html