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CMP0013
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-------
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Duplicate binary directories are not allowed.
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CMake 2.6.3 and below silently permitted add_subdirectory() calls to
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create the same binary directory multiple times. During build system
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generation files would be written and then overwritten in the build
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tree and could lead to strange behavior. CMake 2.6.4 and above
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explicitly detect duplicate binary directories. CMake 2.6.4 always
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considers this case an error. In CMake 2.8.0 and above this policy
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determines whether or not the case is an error. The ``OLD`` behavior for
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this policy is to allow duplicate binary directories. The NEW
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behavior for this policy is to disallow duplicate binary directories
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with an error.
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This policy was introduced in CMake version 2.8.0. CMake version
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|release| warns when the policy is not set and uses ``OLD`` behavior. Use
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the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW`` explicitly.
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.. include:: DEPRECATED.txt
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