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enable_language
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---------------
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Enable languages (CXX/C/OBJC/OBJCXX/Fortran/etc)
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.. code-block:: cmake
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enable_language(<lang>... [OPTIONAL])
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Enables support for the named languages in CMake. This is the same as
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the :command:`project` command but does not create any of the extra
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variables that are created by the project command.
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.. include:: SUPPORTED_LANGUAGES.txt
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By default ``C`` and ``CXX`` are enabled if no language options are given.
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Specify language ``NONE``, or use the ``LANGUAGES`` keyword and list no languages,
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to skip enabling any languages.
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This command must be called in file scope, not in a function call.
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Furthermore, it must be called in the highest directory common to all
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targets using the named language directly for compiling sources or
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indirectly through link dependencies. It is simplest to enable all
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needed languages in the top-level directory of a project.
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The ``OPTIONAL`` keyword is a placeholder for future implementation and
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does not currently work. Instead you can use the :module:`CheckLanguage`
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module to verify support before enabling.
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