Fix -Werror=maybe-uninitialized with GCC 12 for ARM64 (#307)

Author: richiware

include/fastcdr/xcdr/optional.hpp

@@ -207,6 +207,10 @@ class optional
     //! Assigns content from an optional.
     optional& operator =(
             const optional& opt)
+#if defined(__GNUC__) && __GNUC__ == 12
+    __attribute__(
+            (noinline))
+#endif // if defined(__GNUC__) && __GNUC__ == 12
     {
         reset();
         storage_.engaged_ = opt.storage_.engaged_;
@@ -304,7 +308,7 @@ class optional
      *
      * @return The contained value.
      */
-    T&& operator *() && noexcept
+    T && operator *() && noexcept
     {
         return std::move(storage_.val_);
     }
@@ -316,7 +320,7 @@ class optional
      *
      * @return The contained value.
      */
-    const T&& operator *() const&& noexcept
+    const T && operator*() const && noexcept
     {
         return std::move(storage_.val_);
     }