Output: Print fully qualified declarations named in default arguments

In code like

    namespace ns {
      static int const C = 0;
      void f(int = C);
    }

we previously generated `default="C"` for the default argument of `f`
because Clang prints the expression as it was written in the source.
GCC-XML would generate the fully qualified name `default="ns::C"`
which is more useful to tools reading the output.  Update our default
argument printing to do this by hooking in to Clang's pretty printer
and providing a custom implementation for `DeclRefExpr`.

GitHub-Issue: CastXML/CastXML#51

2 files changed, 8 insertions, 0 deletions

diff --git a/test/input/Function-Argument-default-ns.cxx b/test/input/Function-Argument-default-ns.cxx
new file mode 100644
index 0000000..72a7941
--- /dev/null
+++ b/test/input/Function-Argument-default-ns.cxx
@@ -0,0 +1,4 @@
+namespace start {
+  static int const C = 0;
+  void f(int = C);
+}
diff --git a/test/input/Method-Argument-default.cxx b/test/input/Method-Argument-default.cxx
new file mode 100644
index 0000000..dfd86ae
--- /dev/null
+++ b/test/input/Method-Argument-default.cxx
@@ -0,0 +1,4 @@
+class start {
+  static int const C = 0;
+  int method(int = C);
+};