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+CMake Source Code Guide
+***********************
+
+The following is a guide to the CMake source code for developers.
+See documentation on `CMake Development`_ for more information.
+
+.. _`CMake Development`: README.rst
+
+C++ Code Style
+==============
+
+We use `clang-format`_ version **3.8** to define our style for C++ code in
+the CMake source tree.  See the `.clang-format`_ configuration file for our
+style settings.  Use the `Utilities/Scripts/clang-format.bash`_ script to
+format source code.  It automatically runs ``clang-format`` on the set of
+source files for which we enforce style.  The script also has options to
+format only a subset of files, such as those that are locally modified.
+
+.. _`clang-format`: http://clang.llvm.org/docs/ClangFormat.html
+.. _`.clang-format`: ../../.clang-format
+.. _`Utilities/Scripts/clang-format.bash`: ../../Utilities/Scripts/clang-format.bash
+
+C++ Subset Permitted
+====================
+
+CMake supports compiling as C++98 in addition to C++11 and C++14.
+In order to support building on older toolchains some constructs
+need to be handled with care:
+
+* Use ``CM_AUTO_PTR`` instead of ``std::auto_ptr``.
+
+  The ``std::auto_ptr`` template is deprecated in C++11.  We want to use it
+  so we can build on C++98 compilers but we do not want to turn off compiler
+  warnings about deprecated interfaces in general.  Use the ``CM_AUTO_PTR``
+  macro instead.
+
+* Use ``size_t`` instead of ``std::size_t``.
+
+  Various implementations have differing implementation of ``size_t``.
+  When assigning the result of ``.size()`` on a container for example,
+  the result should be assigned to ``size_t`` not to ``std::size_t``,
+  ``unsigned int`` or similar types.