XML writer: resolve declaration-only enum definitions

Let the writer look through declaration-only enums for definitions.

This matches what get_preferred_type, write_class_decl and
write_union_decl do. No current test cases are affected.

	* src/abg-writer.cc (write_enum_type_decl): Look through
	declaration-only types the same as for structs and unions.

Reviewed-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Matthias Maennich <maennich@google.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/src/abg-writer.cc b/src/abg-writer.cc
index 7ed8327a..24a1fd56 100644
--- a/src/abg-writer.cc
+++ b/src/abg-writer.cc
@@ -3008,14 +3008,16 @@ write_array_type_def(const array_type_def_sptr& decl,
 ///
 /// @return true upon succesful completion, false otherwise.
 static bool
-write_enum_type_decl(const enum_type_decl_sptr& decl,
-                     const string&              id,
-                     write_context&             ctxt,
-                     unsigned                   indent)
+write_enum_type_decl(const enum_type_decl_sptr& d,
+                     const string& id,
+                     write_context& ctxt,
+                     unsigned indent)
 {
-  if (!decl)
+  if (!d)
     return false;
 
+  enum_type_decl_sptr decl = is_enum_type(look_through_decl_only_enum(d));
+
   annotate(decl->get_canonical_type(), ctxt, indent);
 
   ostream& o = ctxt.get_ostream();