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CMP0018
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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.
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