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CMake/Help/variable/CMAKE_POLICY_WARNING_CMPNNNN.rst
Brad King 5c41386357 XLClang: Add policy CMP0089 to present as XL for compatibility
We now identify IBM's Clang-based XL compilers, which define
`__ibmxl__`, as `XLClang` rather than `XL`.  In order to support
existing project code that checks for `XL`, add a policy whose OLD
behavior is to present the compiler id as `XL` and whose NEW behavior is
to present the compiler id as `XLClang` as we really detect it.
2019-02-25 08:24:28 -05:00

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CMAKE_POLICY_WARNING_CMP<NNNN>
------------------------------
Explicitly enable or disable the warning when CMake Policy ``CMP<NNNN>``
is not set. This is meaningful only for the few policies that do not
warn by default:
* ``CMAKE_POLICY_WARNING_CMP0025`` controls the warning for
policy :policy:`CMP0025`.
* ``CMAKE_POLICY_WARNING_CMP0047`` controls the warning for
policy :policy:`CMP0047`.
* ``CMAKE_POLICY_WARNING_CMP0056`` controls the warning for
policy :policy:`CMP0056`.
* ``CMAKE_POLICY_WARNING_CMP0060`` controls the warning for
policy :policy:`CMP0060`.
* ``CMAKE_POLICY_WARNING_CMP0065`` controls the warning for
policy :policy:`CMP0065`.
* ``CMAKE_POLICY_WARNING_CMP0066`` controls the warning for
policy :policy:`CMP0066`.
* ``CMAKE_POLICY_WARNING_CMP0067`` controls the warning for
policy :policy:`CMP0067`.
* ``CMAKE_POLICY_WARNING_CMP0082`` controls the warning for
policy :policy:`CMP0082`.
* ``CMAKE_POLICY_WARNING_CMP0089`` controls the warning for
policy :policy:`CMP0089`.
This variable should not be set by a project in CMake code. Project
developers running CMake may set this variable in their cache to
enable the warning (e.g. ``-DCMAKE_POLICY_WARNING_CMP<NNNN>=ON``).
Alternatively, running :manual:`cmake(1)` with the ``--debug-output``,
``--trace``, or ``--trace-expand`` option will also enable the warning.