FindTBB
-------

Finds the Threading Building Blocks (TBB) library.

This is a fallback implementation in case the TBB library does not provide
itself a corresponding TBBConfig.cmake file.

Imported Targets
^^^^^^^^^^^^^^^^

This module provides the following imported targets, if found:

``TBB::tbb``
  Imported target to link against when TBB is found.

Result Variables
^^^^^^^^^^^^^^^^

This module defines the following variables:

``TBB_FOUND``
  Boolean result indicating whether TBB was found.

``TBB_VERSION``
  Version reported by the detected TBB package or pkg-config metadata, if
  available.

Hints
^^^^^

Two strategies are implemented for finding TBB:

1. Searching for the TBB cmake config file, typically named
   ``TBBConfig.cmake``. In recent TBB versions, this file can be
   created using a script provided by TBB itself. Simply set the
   variable ``TBB_DIR`` to the directory containing the config file
   in order to find TBB.

2. Using pkg-config to configure TBB. Therefore it is necessary
   to find the ``tbb.pc`` file. Several distributions provide this file
   directly. In order to point pkg-config to the location of that file,
   simply set the environment variable ``PKG_CONFIG_PATH`` to include
   the directory containing the .pc file, or add this path to the
   ``CMAKE_PREFIX_PATH``.