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DEFINE_SYMBOL
-------------
Define a symbol when compiling this target's sources.
``DEFINE_SYMBOL`` sets the name of the preprocessor symbol defined when
compiling sources in a shared library. If not set here then it is set
to ``target_EXPORTS`` by default (with some substitutions if the target is
not a valid C identifier). This is useful for headers to know whether
they are being included from inside their library or outside to
properly setup dllexport/dllimport decorations on Windows.
On POSIX platforms, this can optionally be used to control the visibility
of symbols.
CMake provides support for such decorations with the :module:`GenerateExportHeader`
module.
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