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Revert commit 2257deb502 (Cmake: Avoid cycle directory dependencies, 2014-08-22) and add a comment explaining the purpose of the original code. The check_library_exists_concat macro is intended to be called multiple times on a sequence of possibly dependent libraries. Later libraries may depend on earlier libraries when they are static. They cannot be safely linked in reverse order on some platforms. Signed-off-by: Brad King <brad.king@kitware.com>