Declare RTS-private prototypes with __attribute__((visibility("hidden")))

This has no effect with static libraries, but when the RTS is in a
shared library it does two things:

 - it prevents the function from being exposed by the shared library

 - internal calls to the function can use the faster non-PLT calls,
   because the function cannot be overriden at link time.

1 files changed, 5 insertions, 0 deletions

diff --git a/rts/Updates.h b/rts/Updates.h
index 843be84131..3b37409476 100644
--- a/rts/Updates.h
+++ b/rts/Updates.h
@@ -9,6 +9,8 @@
 #ifndef UPDATES_H
 #define UPDATES_H
 
+#pragma GCC visibility push(hidden)
+
 /* -----------------------------------------------------------------------------
    Updates
 
@@ -225,4 +227,7 @@ no_slop:
     }								\
   }
 #endif /* CMINUSMINUS */
+
+#pragma GCC visibility pop
+
 #endif /* UPDATES_H */