Don't crash if a constant has a declared but undefined type.

From-SVN: r170632

Don't crash if a constant has a declared but undefined type.
From-SVN: r170632
8ca93ccf · Ian Lance Taylor · b58219c1 · 8ca93ccf
Commit 8ca93ccf authored Mar 03, 2011 by Ian Lance Taylor
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gcc/go/gofrontend/gogo-tree.cc
+10 -1

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--- a/gcc/go/gofrontend/gogo-tree.cc
+++ b/gcc/go/gofrontend/gogo-tree.cc
@@ -926,7 +926,16 @@ Named_object::get_tree(Gogo* gogo, Named_object* function)
 	  {
 	    Type* type = named_constant->type();
 	    if (type != NULL && !type->is_abstract())
-	      expr_tree = fold_convert(type->get_tree(gogo), expr_tree);
+	      {
+		if (!type->is_undefined())
+		  expr_tree = fold_convert(type->get_tree(gogo), expr_tree);
+		else
+		  {
+		    // Make sure we report the error.
+		    type->base();
+		    expr_tree = error_mark_node;
+		  }
+	      }
 	    if (expr_tree == error_mark_node)
 	      decl = error_mark_node;
 	    else if (INTEGRAL_TYPE_P(TREE_TYPE(expr_tree)))