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, 18 insertions, 17 deletions

diff --git a/rts/Sanity.h b/rts/Sanity.h
index 3020246a70..f27c395c44 100644
--- a/rts/Sanity.h
+++ b/rts/Sanity.h
@@ -11,6 +11,8 @@
 
 #ifdef DEBUG
 
+#pragma GCC visibility push(hidden)
+
 # if defined(PAR)
 # define PVM_PE_MASK    0xfffc0000
 # define MAX_PVM_PES    MAX_PES
@@ -19,23 +21,22 @@
 # endif
 
 /* debugging routines */
-extern void checkHeap      ( bdescr *bd );
-extern void checkHeapChunk ( StgPtr start, StgPtr end );
-extern void checkLargeObjects ( bdescr *bd );
-extern void checkTSO       ( StgTSO* tso );
-extern void checkGlobalTSOList ( rtsBool checkTSOs );
-extern void checkStaticObjects ( StgClosure* static_objects );
-extern void checkStackChunk    ( StgPtr sp, StgPtr stack_end );
-extern StgOffset checkStackFrame ( StgPtr sp );
-extern StgOffset checkClosure  ( StgClosure* p );
-
-extern void checkMutableList   ( bdescr *bd, nat gen );
-extern void checkMutableLists ( rtsBool checkTSOs );
-
-extern void checkBQ (StgTSO *bqe, StgClosure *closure);
-
-/* test whether an object is already on update list */
-extern rtsBool isBlackhole( StgTSO* tso, StgClosure* p );
+void checkHeap      ( bdescr *bd );
+void checkHeapChunk ( StgPtr start, StgPtr end );
+void checkLargeObjects ( bdescr *bd );
+void checkTSO       ( StgTSO* tso );
+void checkGlobalTSOList ( rtsBool checkTSOs );
+void checkStaticObjects ( StgClosure* static_objects );
+void checkStackChunk    ( StgPtr sp, StgPtr stack_end );
+StgOffset checkStackFrame ( StgPtr sp );
+StgOffset checkClosure  ( StgClosure* p );
+
+void checkMutableList   ( bdescr *bd, nat gen );
+void checkMutableLists ( rtsBool checkTSOs );
+
+void checkBQ (StgTSO *bqe, StgClosure *closure);
+
+#pragma GCC visibility pop
 
 #endif /* DEBUG */