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-rw-r--r--Help/prop_tgt/DEFINE_SYMBOL.rst8
1 files changed, 7 insertions, 1 deletions
diff --git a/Help/prop_tgt/DEFINE_SYMBOL.rst b/Help/prop_tgt/DEFINE_SYMBOL.rst
index eb7f937..775cf89 100644
--- a/Help/prop_tgt/DEFINE_SYMBOL.rst
+++ b/Help/prop_tgt/DEFINE_SYMBOL.rst
@@ -8,4 +8,10 @@ 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.
+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.