Index: head/usr.bin/dtc/HACKING
===================================================================
--- head/usr.bin/dtc/HACKING	(revision 289995)
+++ head/usr.bin/dtc/HACKING	(revision 289996)
@@ -1,65 +1,63 @@
 $FreeBSD$
 
 Notes for people hacking on dtc
 ===============================
 
 This file contains some notes for people wishing to hack on dtc.
 
 Upstreaming
 -----------
 
 This code is developed in the FreeBSD svn repository:
 
 https://svn.freebsd.org/base/head/usr.bin/dtc
 
 If you got the source from anywhere else and wish to make changes, please
 ensure that you are working against the latest version, or you may end up
 fixing bugs that are already fixed upstream.  Although the license makes no
 requirement that you share any improvements that you make, patches are very
 welcome.
 
 C++11
 -----
 
-This project currently aims to compile with g++ 4.2.1 and so doesn't make any
-use of C++11 features.  It would be a good idea to relax this restriction once
-clang is the default compiler for ARM, MIPS and PowerPC.
+This project uses C++11, as the goal for FreeBSD 11 is to require C/C++11 as a
+minimum, either from clang or an external toolchain.  In particular, it uses
+`std::unique_ptr` extensively for memory management within the tree.  Unique
+pointers are also used in several other places to track ownership.
 
-This code makes use of a lot of iterator loops, which would be cleaner using
-the new syntax in C++11.  It also explicitly deletes a lot of objects held in
-collections in destructors that have these collections as their members.  This
-could be simplified by using `shared_ptr`.
+Most iterator loops use the new loop syntax and the `auto` type for type
+deduction.  Range-based `for` loops generally improve the readability of the
+code, though `auto` should only be used in places where the type can be deduced
+as easily by the reader as by the compiler.
 
-The code does make use of `static_assert()`, but uses a macro in utility.hh to
-remove these if they are not supported.  The FreeBSD standard headers also
-define a compatibility macro the implements static asserts in terms of an array
-with 1 element on success and -1 elements on failure.
+The code also makes use of `static_assert()` to track compile-time invariants.
 
 Adding New Checks
 -----------------
 
 Currently, the biggest weakness of this version of the tool is that it lacks
 most of the semantic checkers that can be implemented by simply reading the
 ePAPR spec.  The `checker` class provides a simple superclass for implementing
 these quite easily.  There are also helper methods on `device_tree` for finding
 specific nodes, for checks that require some understanding of the structure of
 the tree.
 
 We should probably add a parent pointer to the `node` class for easily walking
 up the tree.
 
 Adding Direct C Output
 ----------------------
 
 The FreeBSD build system currently uses dtc to generate a blob and then
 converts this to C source code.  A new `output_writer` subclass could easily
 generate the C directly.
 
 Parser Improvements
 -------------------
 
 There are a few FIXME lines in the parser for some corner cases that are not
 currently used by FreeBSD.  These are mainly related to labels in the middle of
 values.  These can be fixed by creating a new `property_value` with the
 specified label, starting at the location of the label.  Don't forget to remove
 the associated comments from the BUGS section of the man page if you fix this.