https://github.com/Kitware/CMake
Tip revision: b45f9b364382839995c76bc9794bb5ae8fb787b5 authored by Brad King on 01 November 2022, 17:10:48 UTC
CMake 3.25.0-rc3
CMake 3.25.0-rc3
Tip revision: b45f9b3
CMP0018.rst
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