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, 11 insertions, 7 deletions

diff --git a/rts/StgPrimFloat.h b/rts/StgPrimFloat.h
index 5de8360efd..13d3a5965a 100644
--- a/rts/StgPrimFloat.h
+++ b/rts/StgPrimFloat.h
@@ -9,13 +9,17 @@
 #ifndef STGPRIMFLOAT_H
 #define STGPRIMFLOAT_H
 
+#pragma GCC visibility push(hidden)
+
 /* grimy low-level support functions defined in StgPrimFloat.c */
-extern void      __decodeDouble_2Int (I_ *man_sign, W_ *man_high, W_ *man_low, I_ *exp, StgDouble dbl);
-extern void      __decodeFloat_Int (I_ *man, I_ *exp, StgFloat flt);
-extern StgDouble __2Int_encodeDouble (I_ j_high, I_ j_low, I_ e);
-extern StgDouble __int_encodeDouble (I_ j, I_ e);
-extern StgDouble __word_encodeDouble (W_ j, I_ e);
-extern StgFloat  __int_encodeFloat (I_ j, I_ e);
-extern StgFloat  __word_encodeFloat (W_ j, I_ e);
+void      __decodeDouble_2Int (I_ *man_sign, W_ *man_high, W_ *man_low, I_ *exp, StgDouble dbl);
+void      __decodeFloat_Int (I_ *man, I_ *exp, StgFloat flt);
+StgDouble __2Int_encodeDouble (I_ j_high, I_ j_low, I_ e);
+StgDouble __int_encodeDouble (I_ j, I_ e);
+StgDouble __word_encodeDouble (W_ j, I_ e);
+StgFloat  __int_encodeFloat (I_ j, I_ e);
+StgFloat  __word_encodeFloat (W_ j, I_ e);
+
+#pragma GCC visibility pop
 
 #endif /* STGPRIMFLOAT_H */