X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=rts%2Fsm%2FGCThread.h;h=ab5aca72b775b8ab6e55aa0277542b4bbc2ca671;hb=6cf8982ac30be6836a0cdd8be5a6ac1a1a144213;hp=d2459fd96bea680485986a9e551fb9810feacc7c;hpb=9a9803e8dc80ba41bd3e2d31228e64fa6b61060e;p=ghc-hetmet.git

diff --git a/rts/sm/GCThread.h b/rts/sm/GCThread.h
index d2459fd..ab5aca7 100644
--- a/rts/sm/GCThread.h
+++ b/rts/sm/GCThread.h
@@ -217,6 +217,9 @@ extern gc_thread **gc_threads;
 // we have too few registers available.  In my tests it was worth
 // about 5% in GC performance, but of course that might change as gcc
 // improves. -- SDM 2009/04/03
+//
+// We ought to do the same on MacOS X, but __thread is not
+// supported there yet (gcc 4.0.1).
 
 extern __thread gc_thread* gct;
 #define DECLARE_GCT __thread gc_thread* gct;