Bug 822487 - Improve CLOBBER instructions and note how to bypass it. r=gps, 1stpatch=bgirard@mozilla.com

configure.in

@@ -129,8 +129,16 @@ dnl TODO Make this better, ideally this would clobber automaticially
 if test -e $_objdir/CLOBBER; then
   if test $_topsrcdir/CLOBBER -nt $_objdir/CLOBBER; then
     echo "	***"
-    echo "	*	CLOBBER has been modified indicating a clobber is required:"
+    echo "	*	The CLOBBER file has been updated, indicating that an incremental build"
+    echo "	*	since your last build will probably not work. A full build is required."
+    echo "	*	The change that caused this is:"
     cat $_topsrcdir/CLOBBER | sed '/^#/d' | sed 's/^/	*	/'
+    echo "	*	"
+    echo "	*	The easiest way to fix this is to manually delete your objdir:"
+    echo "	*	rm -rf $_objdir"
+    echo "	*	"
+    echo "	*	Or, if you know this clobber doesn't apply to you, it can be ignored with:"
+    echo "	*	cp '$_topsrcdir/CLOBBER' $_objdir"
     echo "	***"
     exit 1
     break;