CMake/Help/policy/CMP0013.rst
Brad King 482a3bf3f0 Help: Document explicitly that policy OLD behavior is deprecated
The most likely documentation page a project author will read in
response to a policy warning is the page for the policy itself.
Add to every policy documentation page a note explicitly stating
that the OLD behavior is deprecated.  Also mention this in the
cmake_policy() command documentation that explains how to set a
policy to OLD.

Suggested-by: Fraser Hutchison <fraser.hutchison@gmail.com>
2015-06-09 09:29:41 -04:00

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