Respect alignment of by-value storage.

test/aligned_class.cpp

@@ -0,0 +1,33 @@
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+#include <boost/python/module.hpp>
+#include <boost/python/def.hpp>
+#include <boost/python/object.hpp>
+#include <boost/python/class.hpp>
+#include <boost/assert.hpp>
+#include <boost/cstdint.hpp>
+
+using namespace boost::python;
+
+struct BOOST_ALIGNMENT(32) X
+{
+    int x;
+    BOOST_ALIGNMENT(32) float f;
+    X(int n, float _f) : x(n), f(_f)
+    {
+        BOOST_ASSERT((reinterpret_cast<uintptr_t>(&f) % 32) == 0);
+    }
+};
+
+int x_function(X& x) { return x.x;}
+float f_function(X& x) { return x.f;}
+
+BOOST_PYTHON_MODULE(aligned_class_ext)
+{
+    class_<X>("X", init<int, float>());
+    def("x_function", x_function);
+    def("f_function", f_function);
+}
+
+#include "module_tail.cpp"