mangled parameters or return values

[patrickhno]

On OSX objc_allocateClassPair parameters or return value gets mangled somehow.
The last output line of this example should be "Test" and not a blank string ""

obj = CFunc::call(CFunc::Pointer, "objc_getClass", 'NSObject')
v = CFunc::Int.new
v.value = 0
klass = CFunc::call(CFunc::Pointer, "objc_allocateClassPair", obj, 'Test', v)
name = CFunc::call(CFunc::Pointer, "class_getName", obj)
puts name.to_s.inspect  # => "NSObject"
name = CFunc::call(CFunc::Pointer, "class_getName", klass)
puts name.to_s.inspect  # => ""

Both ffi library itself using c and ruby ffi behaves as expected with the exact same sequence of calls.