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+CMP0018
+-------
+
+Ignore ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` variable.
+
+CMake 2.8.8 and lower compiled sources in ``SHARED`` and ``MODULE`` libraries
+using the value of the undocumented ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS``
+platform variable. The variable contained platform-specific flags
+needed to compile objects for shared libraries. Typically it included
+a flag such as ``-fPIC`` for position independent code but also included
+other flags needed on certain platforms. CMake 2.8.9 and higher
+prefer instead to use the :prop_tgt:`POSITION_INDEPENDENT_CODE` target
+property to determine what targets should be position independent, and new
+undocumented platform variables to select flags while ignoring
+``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` completely.
+
+The default for either approach produces identical compilation flags,
+but if a project modifies ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` from its
+original value this policy determines which approach to use.
+
+The ``OLD`` behavior for this policy is to ignore the
+:prop_tgt:`POSITION_INDEPENDENT_CODE` property for all targets and use the
+modified value of ``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` for ``SHARED`` and
+``MODULE`` libraries.
+
+The ``NEW`` behavior for this policy is to ignore
+``CMAKE_SHARED_LIBRARY_<Lang>_FLAGS`` whether it is modified or not and
+honor the :prop_tgt:`POSITION_INDEPENDENT_CODE` target property.
+
+This policy was introduced in CMake version 2.8.9. CMake version
+|release| warns when the policy is not set and uses ``OLD`` behavior. Use
+the :command:`cmake_policy` command to set it to ``OLD`` or ``NEW``
+explicitly.
+
+.. include:: DEPRECATED.txt