tools/depends/target/zlib/visibility.patch


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--- a/zconf.h.in
+++ b/zconf.h.in
@@ -374,7 +374,11 @@
 #endif
 
 #ifndef ZEXTERN
-#  define ZEXTERN extern
+#  ifdef HAVE_HIDDEN
+#    define ZEXTERN extern __attribute__((visibility ("default")))
+#  else
+#    define ZEXTERN extern
+#  endif
 #endif
 #ifndef ZEXPORT
 #  define ZEXPORT