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, 5 insertions, 1 deletions

diff --git a/rts/sm/Compact.h b/rts/sm/Compact.h
index 7a237ac362..1e89ad36a8 100644
--- a/rts/sm/Compact.h
+++ b/rts/sm/Compact.h
@@ -14,6 +14,8 @@
 #ifndef SM_COMPACT_H
 #define SM_COMPACT_H
 
+#pragma GCC visibility push(hidden)
+
 INLINE_HEADER rtsBool
 mark_stack_empty(void)
 {
@@ -74,6 +76,8 @@ is_marked(StgPtr p, bdescr *bd)
     return (*bitmap_word & bit_mask);
 }
 
-extern void compact (StgClosure *static_objects);
+void compact (StgClosure *static_objects);
+
+#pragma GCC visibility pop
 
 #endif /* SM_COMPACT_H */