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, 8 insertions, 4 deletions

diff --git a/rts/RetainerProfile.h b/rts/RetainerProfile.h
index da9a847478..7278dc7465 100644
--- a/rts/RetainerProfile.h
+++ b/rts/RetainerProfile.h
@@ -14,10 +14,12 @@
 
 #include "RetainerSet.h"
 
-extern void  initRetainerProfiling ( void );
-extern void  endRetainerProfiling  ( void );
-extern void  retainerProfile       ( void );
-extern void resetStaticObjectForRetainerProfiling( StgClosure *static_objects );
+#pragma GCC visibility push(hidden)
+
+void initRetainerProfiling ( void );
+void endRetainerProfiling  ( void );
+void retainerProfile       ( void );
+void resetStaticObjectForRetainerProfiling( StgClosure *static_objects );
 
 extern StgWord flip;
 
@@ -41,6 +43,8 @@ retainerSetOf( StgClosure *c )
 extern lnat retainerStackBlocks ( void );
 #endif
 
+#pragma GCC visibility pop
+
 #endif /* PROFILING */
 
 #endif /* RETAINERPROFILE_H */