(merge from head) Output generated files only when debug output is on, -n turns this on but -d+10 doesn't.

[SVN r34993]

tools/build

@@ -1 +1 @@
-Subproject commit c6597be78d9dfca200963a8ef0b18f277a5d03ec
+Subproject commit 47a5cc4d877939a41939026eb488f1415bc14a1d