Apply changes to merge with clang upstream Nov 10th 2010.
diff --git a/clang-host-build.mk b/clang-host-build.mk
index dd399bd..f58014a 100644
--- a/clang-host-build.mk
+++ b/clang-host-build.mk
@@ -4,6 +4,10 @@
 	-Wno-long-long	\
 	$(LOCAL_CFLAGS)
 
+LOCAL_CPPFLAGS := \
+	-Wno-sign-promo \
+	$(LOCAL_CPPFLAGS)
+
 # Make sure bionic is first so we can include system headers.
 LOCAL_C_INCLUDES :=	\
 	$(CLANG_ROOT_PATH)/include	\