X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Debug%2FTrace.hs;h=ebacb6c3d7fa28d37e385a2d240c97b2bd4d8d78;hb=41e8fba828acbae1751628af50849f5352b27873;hp=c30c8111d15be3e989de602f74c1856b2a189684;hpb=6ec0a71d8daa9728a9c93bcbfa443d9310423d98;p=ghc-base.git

diff --git a/Debug/Trace.hs b/Debug/Trace.hs
index c30c811..ebacb6c 100644
--- a/Debug/Trace.hs
+++ b/Debug/Trace.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP, ForeignFunctionInterface #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Debug.Trace
@@ -41,7 +43,9 @@ putTraceMsg msg = do
      withCString msg  $ \cmsg ->
       debugBelch cfmt cmsg
 
-foreign import ccall unsafe "RtsMessages.h debugBelch"
+-- don't use debugBelch() directly, because we cannot call varargs functions
+-- using the FFI.
+foreign import ccall unsafe "HsBase.h debugBelch2"
    debugBelch :: CString -> CString -> IO ()
 #endif