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Ninja only: List of available pools.
A pool is a named integer property and defines the maximum number
of concurrent jobs which can be started by a rule assigned to the pool.
The :prop_gbl:`JOB_POOLS` property is a semicolon-separated list of
pairs using the syntax NAME=integer (without a space after the equality sign).
For instance:
.. code-block:: cmake
set_property(GLOBAL PROPERTY JOB_POOLS two_jobs=2 ten_jobs=10)
Defined pools could be used globally by setting
:variable:`CMAKE_JOB_POOL_COMPILE` and :variable:`CMAKE_JOB_POOL_LINK`
or per target by setting the target properties
:prop_tgt:`JOB_POOL_COMPILE` and :prop_tgt:`JOB_POOL_LINK`.
:command:`Custom commands <add_custom_command>` and
:command:`custom targets <add_custom_target>` can specify pools using the
option ``JOB_POOL``.
Using a pool that is not defined by :prop_gbl:`JOB_POOLS` causes
an error by ninja at build time.
If not set, this property uses the value of the :variable:`CMAKE_JOB_POOLS`
Build targets provided by CMake that are meant for individual interactive
use, such as ``install``, are placed in the ``console`` pool automatically.