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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.
.. |INTRODUCED_IN_CMAKE_VERSION| replace:: 2.8.9
.. |WARNS_OR_DOES_NOT_WARN| replace:: warns
.. include:: STANDARD_ADVICE.txt
.. include:: DEPRECATED.txt
|
