Fix gcc 4.6 warnings; fixes #5176

Based on a patch from David Terei.

Some parts are a little ugly (e.g. defining things that only ASSERTs
use only when DEBUG is defined), so we might want to tweak things a
little.

I've also turned off -Werror for didn't-inline warnings, as we now
get a few such warnings.

1 files changed, 2 insertions, 2 deletions

diff --git a/rts/STM.c b/rts/STM.c
index e8d3fc0e0b..f8f56a2905 100644
--- a/rts/STM.c
+++ b/rts/STM.c
@@ -1089,7 +1089,7 @@ static void disconnect_invariant(Capability *cap,
   FOR_EACH_ENTRY(last_execution, e, {
     StgTVar *s = e -> tvar;
     StgTVarWatchQueue *q = s -> first_watch_queue_entry;
-    StgBool found = FALSE;
+    DEBUG_ONLY( StgBool found = FALSE );
     TRACE("  looking for trec on tvar=%p", s);
     for (q = s -> first_watch_queue_entry; 
 	 q != END_STM_WATCH_QUEUE; 
@@ -1110,7 +1110,7 @@ static void disconnect_invariant(Capability *cap,
 	}
 	TRACE("  found it in watch queue entry %p", q);
 	free_stg_tvar_watch_queue(cap, q);
-	found = TRUE;
+	DEBUG_ONLY( found = TRUE );
 	break;
       }
     }