go-gcc.cc (Gcc_backend::non_zero_size_type): If a struct has a fields...

	* go-gcc.cc (Gcc_backend::non_zero_size_type): If a struct has a
	fields, recreate those fields with the first one with a non-zero
	size.

From-SVN: r201222

gcc/go/ChangeLog

+2013-07-24  Ian Lance Taylor  <iant@google.com>
+
+	* go-gcc.cc (Gcc_backend::non_zero_size_type): If a struct has a
+	fields, recreate those fields with the first one with a non-zero
+	size.
+
 2013-07-23  Ian Lance Taylor  <iant@google.com>
 
 	* go-backend.c: Don't #include "rtl.h".

gcc/go/go-gcc.cc

@@ -1242,7 +1242,29 @@ Gcc_backend::non_zero_size_type(tree type)
   switch (TREE_CODE(type))
     {
     case RECORD_TYPE:
+      if (TYPE_FIELDS(type) != NULL_TREE)
 	{
+	  tree ns = make_node(RECORD_TYPE);
+	  tree field_trees = NULL_TREE;
+	  tree *pp = &field_trees;
+	  for (tree field = TYPE_FIELDS(type);
+	       field != NULL_TREE;
+	       field = DECL_CHAIN(field))
+	    {
+	      tree ft = TREE_TYPE(field);
+	      if (field == TYPE_FIELDS(type))
+		ft = non_zero_size_type(ft);
+	      tree f = build_decl(DECL_SOURCE_LOCATION(field), FIELD_DECL,
+				  DECL_NAME(field), ft);
+	      DECL_CONTEXT(f) = ns;
+	      *pp = f;
+	      pp = &DECL_CHAIN(f);
+	    }
+	  TYPE_FIELDS(ns) = field_trees;
+	  layout_type(ns);
+	  return ns;
+	}
+
       if (go_non_zero_struct == NULL_TREE)
 	{
 	  type = make_node(RECORD_TYPE);
@@ -1255,7 +1277,6 @@ Gcc_backend::non_zero_size_type(tree type)
 	  go_non_zero_struct = type;
 	}
       return go_non_zero_struct;
-      }
 
     case ARRAY_TYPE:
       {