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, 9 insertions, 5 deletions

diff --git a/rts/ProfHeap.h b/rts/ProfHeap.h
index a3da424d24..b781235c77 100644
--- a/rts/ProfHeap.h
+++ b/rts/ProfHeap.h
@@ -9,10 +9,14 @@
 #ifndef PROFHEAP_H
 #define PROFHEAP_H
 
-extern void    heapCensus( void );
-extern nat     initHeapProfiling( void );
-extern void    endHeapProfiling( void );
-extern void    LDV_recordDead( StgClosure *c, nat size );
-extern rtsBool strMatchesSelector( char* str, char* sel );
+#pragma GCC visibility push(hidden)
+
+void    heapCensus         (void);
+nat     initHeapProfiling  (void);
+void    endHeapProfiling   (void);
+void    LDV_recordDead     (StgClosure *c, nat size);
+rtsBool strMatchesSelector (char* str, char* sel);
+
+#pragma GCC visibility pop
 
 #endif /* PROFHEAP_H */