Set alignment to max for sbo buffer.

Author: klemens-morgenstern

include/boost/cobalt/op.hpp

@@ -21,7 +21,7 @@ namespace boost::cobalt
 
 
 template<typename ... Args>
-struct [[nodiscard]] op
+struct [[nodiscard]] alignas(alignof(std::max_align_t))  op
 {
   virtual void ready(cobalt::handler<Args...>) {};
   virtual void initiate(cobalt::completion_handler<Args...> complete) = 0 ;
@@ -57,6 +57,7 @@ struct [[nodiscard]] op
     resource_type *resource;
 
     template<typename Promise>
+    BOOST_COBALT_MSVC_NOINLINE
     bool await_suspend(std::coroutine_handle<Promise> h
 #if defined(BOOST_ASIO_ENABLE_HANDLER_TRACKING)
                      , const boost::source_location & loc = BOOST_CURRENT_LOCATION
@@ -91,19 +92,15 @@ struct [[nodiscard]] op
       return await_resume(as_result_tag{}).value(loc);
     }
 
-#if defined(_MSC_VER)
-    BOOST_NOINLINE
-#endif
+    BOOST_COBALT_MSVC_NOINLINE
     auto await_resume(const struct as_tuple_tag &)
     {
       if (init_ep)
         std::rethrow_exception(init_ep);
       return *std::move(result);
     }
 
-#if defined(_MSC_VER)
-    BOOST_NOINLINE
-#endif
+    BOOST_COBALT_MSVC_NOINLINE
     auto await_resume(const struct as_result_tag &)
     {
       if (init_ep)
@@ -114,7 +111,7 @@ struct [[nodiscard]] op
 
   struct awaitable : awaitable_base
   {
-    char buffer[BOOST_COBALT_SBO_BUFFER_SIZE];
+    alignas(alignof(std::max_align_t)) char buffer[BOOST_COBALT_SBO_BUFFER_SIZE];
     detail::sbo_resource resource{buffer, sizeof(buffer)};
 
     awaitable(op<Args...> * op_) : awaitable_base(op_, &resource) {}