文件操作 - DEFINE_SYMBOL.rst
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文件: /usr/share/cmake3/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.
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