When generating C, don't pretend functions are data

We used to generated things like:
    extern StgWordArray (newCAF) __attribute__((aligned (8)));
    ((void (*)(void *))(W_)&newCAF)((void *)R1.w);
(which is to say, pretend that newCAF is some data, then cast it to a
function and call it).
This goes wrong on at least IA64, where:
    A function pointer on the ia64 does not point to the first byte of
    code. Intsead, it points to a structure that describes the function.
    The first quadword in the structure is the address of the first byte
    of code
so we end up dereferencing function pointers one time too many, and
segfaulting.

1 files changed, 2 insertions, 1 deletions

diff --git a/compiler/codeGen/CgForeignCall.hs b/compiler/codeGen/CgForeignCall.hs
index ceff757d3d..cf99f316c3 100644
--- a/compiler/codeGen/CgForeignCall.hs
+++ b/compiler/codeGen/CgForeignCall.hs
@@ -34,6 +34,7 @@ import Constants
 import StaticFlags
 import Outputable
 import FastString
+import BasicTypes
 
 import Control.Monad
 
@@ -77,7 +78,7 @@ emitForeignCall results (CCall (CCallSpec target cconv safety)) args live
       (call_args, cmm_target)
 	= case target of
 	   StaticTarget lbl -> (args, CmmLit (CmmLabel 
-					(mkForeignLabel lbl call_size False)))
+					(mkForeignLabel lbl call_size False IsFunction)))
 	   DynamicTarget    ->  case args of
 	                        (CmmHinted fn _):rest -> (rest, fn)
 	                        [] -> panic "emitForeignCall: DynamicTarget []"