| 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 | |