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--- a/include/boost/config/compiler/clang.hpp (index)
+++ b/include/boost/config/compiler/clang.hpp (working tree)
@@ -103,1 +103,3 @@
-# define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
+# ifndef BOOST_SYMBOL_EXPORT
+# define BOOST_SYMBOL_EXPORT __attribute__((__visibility__("default")))
+# endif
@@ -103,1 +103,3 @@
-# define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
+# ifndef BOOST_SYMBOL_VISIBLE
+# define BOOST_SYMBOL_VISIBLE __attribute__((__visibility__("default")))
+# endif
@@ -103,1 +103,3 @@
-# define BOOST_SYMBOL_IMPORT
+# ifndef BOOST_SYMBOL_IMPORT
+# define BOOST_SYMBOL_IMPORT
+# endif
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