Draft partial fix

src/include/migraphx/literal.hpp

@@ -45,6 +45,11 @@ struct literal : raw_data<literal>
 {
     literal() {}
 
+    /*!
+     * Empty literal with a specific shape type
+     */
+    explicit literal(shape::type_t shape_type) : m_shape(shape_type, {}) {}
+
     template <class U, class T = deduce<U>, shape::type_t ShapeType = shape::get_type<T>{}>
     literal(U x) : buffer(make_shared_array<char>(sizeof(T))), m_shape(ShapeType)
     {

src/onnx/onnx_parser.cpp

@@ -60,7 +60,7 @@ create_literal(shape::type_t shape_type, const std::vector<size_t>& dims, const
         std::accumulate(dims.begin(), dims.end(), std::size_t(1), std::multiplies<std::size_t>());
     if(elem_num == 0)
     {
-        return {};
+        return literal{shape_type};
     }
 
     // in case of scalar constants in onnx file, use dims=1 to fill initializer data
@@ -77,7 +77,7 @@ static literal create_literal(shape::type_t shape_type, const std::vector<size_t
         std::accumulate(dims.begin(), dims.end(), std::size_t(1), std::multiplies<std::size_t>());
     if(elem_num == 0)
     {
-        return {};
+        return literal{shape_type};
     }
 
     // scalar input

src/onnx/parse_constant.cpp

@@ -43,7 +43,7 @@ struct parse_constant : op_parser<parse_constant>
         // return empty literal
         if(v.get_shape().elements() == 0)
         {
-            return info.add_literal(literal{});
+            return info.add_literal(literal{v.get_shape().type()});
         }
 
         auto dim_size = info.attributes.at("value").t().dims_size();

test/onnx/onnx_test.cpp

@@ -640,7 +640,7 @@ TEST_CASE(constant_scalar_test2)
 {
     migraphx::program p;
     auto* mm = p.get_main_module();
-    mm->add_literal(migraphx::literal{migraphx::shape{migraphx::shape::int64_type, {}}, {0}});
+    mm->add_literal(migraphx::literal{migraphx::shape::int64_type});
     auto prog = optimize_onnx("constant_scalar_test2.onnx");
 
     EXPECT(p == prog);