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, 10 insertions, 6 deletions

diff --git a/rts/Proftimer.h b/rts/Proftimer.h
index 1379792d66..7d4295642d 100644
--- a/rts/Proftimer.h
+++ b/rts/Proftimer.h
@@ -9,17 +9,21 @@
 #ifndef PROFTIMER_H
 #define PROFTIMER_H
 
-extern void initProfTimer      ( void );
-extern void handleProfTick     ( void );
+#pragma GCC visibility push(hidden)
+
+void initProfTimer      ( void );
+void handleProfTick     ( void );
 
 #ifdef PROFILING
-extern void stopProfTimer      ( void );
-extern void startProfTimer     ( void );
+void stopProfTimer      ( void );
+void startProfTimer     ( void );
 #endif
 
-extern void stopHeapProfTimer  ( void );
-extern void startHeapProfTimer ( void );
+void stopHeapProfTimer  ( void );
+void startHeapProfTimer ( void );
 
 extern rtsBool performHeapProfile;
 
+#pragma GCC visibility pop
+
 #endif /* PROFTIMER_H */