Workaround for clang 3.2 libc++ empty struct bug.

Certain tests have empty structs or classes.
This encounters a bug with clang: http://llvm.org/bugs/show_bug.cgi?id=16764
This is fixed in later versions of clang, but not the version
currently bundled with Mavericks and XCode 5

Examples/test-suite/constructor_copy.i

@@ -94,14 +94,16 @@ public:
 
 namespace Space {
 class Flow {
+int x;
 public:
-  Flow(int i) {}
+ Flow(int i) : x(i) {}
 };
 
 
 class FlowFlow {
+int x;
 public:
-  FlowFlow(int i) {}
+ FlowFlow(int i) : x(i) {}
 };
 
 }

Examples/test-suite/ignore_template_constructor.i

@@ -17,9 +17,10 @@
 #if defined(SWIG_GOOD_VECTOR)
 %inline %{
 class Flow {
-  Flow() {}
+double x;
+ Flow():x(0.0) {}
 public:
-  Flow(double d) {}
+ Flow(double d) : x(d) {}
 };
 %}
 
@@ -28,9 +29,10 @@ public:
 
 %inline %{
 class Flow {
+double x;
 public:
-  Flow() {}
-  Flow(double d) {}
+ Flow(): x(0.0) {}
+ Flow(double d) : x(d) {}
 };
 %}
 

Examples/test-suite/smart_pointer_inherit.i

@@ -47,6 +47,7 @@
 
 %inline %{
 class ItkLevelSetNodeUS2 {
+  int x;
 };
 %}
 

Examples/test-suite/std_containers.i

@@ -191,7 +191,8 @@ template <class C> struct Param
 
   struct Foo
   {
-    Foo(int i) {
+    int x;
+    Foo(int i) : x(i) {
     }
   };
   

Examples/test-suite/template_matrix.i

@@ -21,6 +21,7 @@ namespace simuPOP
   template<class _POP1, class _POP2 = POP>
   class Operator
   {
+    int x;
   };
 }
 

Examples/test-suite/template_opaque.i

@@ -6,6 +6,7 @@
   {
     struct OpaqueStruct 
     {
+      int x;
     };
   }