CMake/Help/prop_tgt/DEFINE_SYMBOL.rst

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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.