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+Goal:
+-----
+  CppClean attempts to find problems in C++ source that slow development
+  in large code bases, for example various forms of unused code.
+  Unused code can be unused functions, methods, data members, types, etc
+  to unnecessary #include directives.  Unnecessary #includes can cause
+  considerable extra compiles increasing the edit-compile-run cycle.
+
+  The project home page is:   http://code.google.com/p/cppclean/
+
+
+Features:
+---------
+ * Find and print C++ language constructs: classes, methods, functions, etc.
+ * Find classes with virtual methods, no virtual destructor, and no bases
+ * Find global/static data that are potential problems when using threads
+ * Unnecessary forward class declarations
+ * Unnecessary function declarations
+ * Undeclared function definitions
+ * (planned) Find unnecessary header files #included
+   - No direct reference to anything in the header
+   - Header is unnecessary if classes were forward declared instead
+ * (planned) Source files that reference headers not directly #included,
+   ie, files that rely on a transitive #include from another header
+ * (planned) Unused members (private, protected, & public) methods and data
+ * (planned) Store AST in a SQL database so relationships can be queried
+
+AST is Abstract Syntax Tree, a representation of parsed source code.
+http://en.wikipedia.org/wiki/Abstract_syntax_tree
+
+
+System Requirements:
+--------------------
+ * Python 2.4 or later (2.3 probably works too)
+ * Works on Windows (untested), Mac OS X, and Unix
+
+
+How to Run:
+-----------
+  For all examples, it is assumed that cppclean resides in a directory called
+  /cppclean.
+
+  To print warnings for classes with virtual methods, no virtual destructor and
+  no base classes:
+
+      /cppclean/run.sh nonvirtual_dtors.py file1.h file2.h file3.cc ...
+
+  To print all the functions defined in header file(s):
+
+      /cppclean/run.sh functions.py file1.h file2.h ...
+
+  All the commands take multiple files on the command line.  Other programs
+  include: find_warnings, headers, methods, and types.  Some other programs
+  are available, but used primarily for debugging.
+
+  run.sh is a simple wrapper that sets PYTHONPATH to /cppclean and then
+  runs the program in /cppclean/cpp/PROGRAM.py.  There is currently
+  no equivalent for Windows.  Contributions for a run.bat file
+  would be greatly appreciated.
+
+
+How to Configure:
+-----------------
+  You can add a siteheaders.py file in /cppclean/cpp to configure where
+  to look for other headers (typically -I options passed to a compiler).
+  Currently two values are supported:  _TRANSITIVE and GetIncludeDirs.
+  _TRANSITIVE should be set to a boolean value (True or False) indicating
+  whether to transitively process all header files.  The default is False.
+
+  GetIncludeDirs is a function that takes a single argument and returns
+  a sequence of directories to include.  This can be a generator or
+  return a static list.
+
+      def GetIncludeDirs(filename):
+          return ['/some/path/with/other/headers']
+
+      # Here is a more complicated example.
+      def GetIncludeDirs(filename):
+          yield '/path1'
+          yield os.path.join('/path2', os.path.dirname(filename))
+          yield '/path3'
+
+
+How to Test:
+------------
+  For all examples, it is assumed that cppclean resides in a directory called
+  /cppclean.  The tests require
+
+  cd /cppclean
+  make test
+  # To generate expected results after a change:
+  make expected
+
+
+Current Status:
+---------------
+  The parser works pretty well for header files, parsing about 99% of Google's
+  header files.  Anything which inspects structure of C++ source files should
+  work reasonably well.  Function bodies are not transformed to an AST,
+  but left as tokens.  Much work is still needed on finding unused header files
+  and storing an AST in a database.
+
+
+Non-goals:
+----------
+ * Parsing all valid C++ source
+ * Handling invalid C++ source gracefully
+ * Compiling to machine code (or anything beyond an AST)
+
+
+Contact:
+--------
+  If you used cppclean, I would love to hear about your experiences
+  cppclean@googlegroups.com.  Even if you don't use cppclean, I'd like to
+  hear from you.  :-)  (You can contact me directly at:  nnorwitz@gmail.com)