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CMP0049
-------

Do not expand variables in target source entries.

CMake 2.8.12 and lower performed an extra layer of variable expansion
when evaluating source file names::

  set(a_source foo.c)
  add_executable(foo \${a_source})

.. note: no cmake highlighting since this syntax is deprecated

This was undocumented behavior.

The ``OLD`` behavior for this policy is to expand such variables when processing
the target sources.  The ``NEW`` behavior for this policy is to issue an error
if such variables need to be expanded.

This policy was introduced in CMake version 3.0.
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