Add header + comments

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@97308 91177308-0d34-0410-b5e6-96231b3b80d8

examples/wpa/Makefile

@@ -1,3 +1,12 @@
+##===- examples/wpa/Makefile -------------------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
 LEVEL = ../../../..
 
 TOOLNAME = clang-wpa
@@ -7,6 +16,9 @@ NO_INSTALL = 1
 # No plugins, optimize startup time.
 TOOL_NO_EXPORTS = 1
 
+# Include this here so we can get the configuration of the targets that have
+# been configured for construction. We have to do this early so we can set up
+# LINK_COMPONENTS before including Makefile.rules
 include $(LEVEL)/Makefile.config
 
 LINK_COMPONENTS := bitreader mc core