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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.