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separate_arguments
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------------------
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Parse command-line arguments into a semicolon-separated list.
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.. code-block:: cmake
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separate_arguments(<variable> <mode> <args>)
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Parses a space-separated string ``<args>`` into a list of items,
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and stores this list in semicolon-separated standard form in ``<variable>``.
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This function is intended for parsing command-line arguments.
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The entire command line must be passed as one string in the
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argument ``<args>``.
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The exact parsing rules depend on the operating system.
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They are specified by the ``<mode>`` argument which must
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be one of the following keywords:
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``UNIX_COMMAND``
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Arguments are separated by unquoted whitespace.
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Both single-quote and double-quote pairs are respected.
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A backslash escapes the next literal character (``\"`` is ``"``);
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there are no special escapes (``\n`` is just ``n``).
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``WINDOWS_COMMAND``
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A Windows command-line is parsed using the same
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syntax the runtime library uses to construct argv at startup. It
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separates arguments by whitespace that is not double-quoted.
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Backslashes are literal unless they precede double-quotes. See the
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MSDN article `Parsing C Command-Line Arguments`_ for details.
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``NATIVE_COMMAND``
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Proceeds as in ``WINDOWS_COMMAND`` mode if the host system is Windows.
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Otherwise proceeds as in ``UNIX_COMMAND`` mode.
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.. _`Parsing C Command-Line Arguments`: https://msdn.microsoft.com/library/a1y7w461.aspx
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.. code-block:: cmake
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separate_arguments(<var>)
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Convert the value of ``<var>`` to a semi-colon separated list. All
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spaces are replaced with ';'. This helps with generating command
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lines.
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