Fix C++11 type aliasing seg fault.

Closes #424

Examples/test-suite/common.mk

@@ -543,6 +543,7 @@ CPP11_TEST_CASES = \
 	cpp11_template_explicit \
 	cpp11_template_typedefs \
 	cpp11_type_traits \
+	cpp11_type_aliasing \
 	cpp11_uniform_initialization \
 	cpp11_unrestricted_unions \
 	cpp11_userdefined_literals \

Examples/test-suite/cpp11_type_aliasing.i

@@ -0,0 +1,46 @@
+%module cpp11_type_aliasing
+
+// Type aliasing seg fault : Github issue #424
+
+%warnfilter(SWIGWARN_CPP11_ALIAS_DECLARATION) Target;
+
+%inline %{
+
+namespace Halide {
+
+struct Target {
+  int bits;
+  Target(int bits=32) : bits(bits) {}
+};
+
+class NamesInterface {
+public:
+  using Target = Halide::Target;
+};
+
+Target get_host_target() { 
+  return Target();
+}
+
+namespace Internal {
+
+template <typename T> class GeneratorParam {
+  T value;
+public:
+  GeneratorParam(const char *name, const T &v) : value(v) {}
+
+  T getValue() { 
+    return value;
+  }
+};
+
+class GeneratorBase : public NamesInterface {
+public:
+  GeneratorParam<Target> target{ "target", Halide::get_host_target() };
+};
+
+}
+}
+%}
+
+%template(Halide_Target) Halide::Internal::GeneratorParam<Halide::Target>;

Examples/test-suite/java/cpp11_type_aliasing_runme.java

@@ -0,0 +1,20 @@
+import cpp11_type_aliasing.*;
+
+public class cpp11_type_aliasing_runme {
+
+  static {
+    try {
+        System.loadLibrary("cpp11_type_aliasing");
+    } catch (UnsatisfiedLinkError e) {
+      System.err.println("Native code library failed to load. See the chapter on Dynamic Linking Problems in the SWIG Java documentation for help.\n" + e);
+      System.exit(1);
+    }
+  }
+
+  public static void main(String argv[]) {
+    Halide_Target ht = new GeneratorBase().getTarget();
+    Target x = ht.getValue();
+    if (x.getBits() != 32)
+      throw new RuntimeException("Incorrect bits");
+  }
+}