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/Ticker.h b/rts/Ticker.h
index a39e7d69c1..159820d399 100644
--- a/rts/Ticker.h
+++ b/rts/Ticker.h
@@ -9,11 +9,15 @@
 #ifndef TICKER_H
 #define TICKER_H
 
+#pragma GCC visibility push(hidden)
+
 typedef void (*TickProc)(int);
 
-extern void initTicker  (nat ms, TickProc handle_tick);
-extern void startTicker (void);
-extern void stopTicker  (void);
-extern void exitTicker  (void);
+void initTicker  (nat ms, TickProc handle_tick);
+void startTicker (void);
+void stopTicker  (void);
+void exitTicker  (void);
+
+#pragma GCC visibility pop
 
 #endif /* TICKER_H */