[vala/0.36] codegen: Emit struct declaration typedef before resolving its fields

[Rico Tzschichholz <ricotz src gnome org>]

commit 8f433516c0d56a28d431b9415d5e8237b58437dc
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Jan 10 20:02:39 2019 +0100

    codegen: Emit struct declaration typedef before resolving its fields
    
    This a regression when compiling a circular dependency of delegates with
    structs.
    
    Regression of 7adb3a45bb8d663c0cfca55af26b7e6f7292b14a
    
    See https://gitlab.gnome.org/GNOME/vala/issues/318

 codegen/valaccodestructmodule.vala | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/codegen/valaccodestructmodule.vala b/codegen/valaccodestructmodule.vala
index b1f160c1d..66b8fe33a 100644
--- a/codegen/valaccodestructmodule.vala
+++ b/codegen/valaccodestructmodule.vala
@@ -64,6 +64,12 @@ public abstract class Vala.CCodeStructModule : CCodeBaseModule {
                        decl_space.add_type_member_declaration (type_fun.get_declaration ());
                }
 
+               if (st.base_struct == null) {
+                       decl_space.add_type_declaration (new CCodeTypeDefinition ("struct _%s".printf 
(get_ccode_name (st)), new CCodeVariableDeclarator (get_ccode_name (st))));
+               } else {
+                       decl_space.add_type_declaration (new CCodeTypeDefinition (get_ccode_name 
(st.base_struct), new CCodeVariableDeclarator (get_ccode_name (st))));
+               }
+
                var instance_struct = new CCodeStruct ("_%s".printf (get_ccode_name (st)));
                instance_struct.modifiers |= (st.version.deprecated ? CCodeModifiers.DEPRECATED : 0);
 
@@ -107,11 +113,7 @@ public abstract class Vala.CCodeStructModule : CCodeBaseModule {
                }
 
                if (st.base_struct == null) {
-                       decl_space.add_type_declaration (new CCodeTypeDefinition ("struct _%s".printf 
(get_ccode_name (st)), new CCodeVariableDeclarator (get_ccode_name (st))));
-
                        decl_space.add_type_definition (instance_struct);
-               } else {
-                       decl_space.add_type_declaration (new CCodeTypeDefinition (get_ccode_name 
(st.base_struct), new CCodeVariableDeclarator (get_ccode_name (st))));
                }
 
                var function = new CCodeFunction (get_ccode_dup_function (st), get_ccode_name (st) + "*");