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