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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 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
+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 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 cmake_policy command to set it to OLD or NEW explicitly.