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exec_program
------------
Deprecated. Use the :command:`execute_process` command instead.
Run an executable program during the processing of the CMakeList.txt
file.
::
exec_program(Executable [directory in which to run]
[ARGS <arguments to executable>]
[OUTPUT_VARIABLE <var>]
[RETURN_VALUE <var>])
The executable is run in the optionally specified directory. The
executable can include arguments if it is double quoted, but it is
better to use the optional ``ARGS`` argument to specify arguments to the
program. This is because cmake will then be able to escape spaces in
the executable path. An optional argument ``OUTPUT_VARIABLE`` specifies a
variable in which to store the output. To capture the return value of
the execution, provide a ``RETURN_VALUE``. If ``OUTPUT_VARIABLE`` is
specified, then no output will go to the stdout/stderr of the console
running cmake.
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