src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.options.processor/src/org/graalvm/compiler/options/processor/OptionProcessor.java

*** 172,182 ****
                  processingEnv.getMessager().printMessage(Kind.ERROR, "Unexpected enclosing element kind: " + enclosing.getKind(), element);
                  return;
              }
              enclosing = enclosing.getEnclosingElement();
          }
!         if (enclosingPackage == null) {
              processingEnv.getMessager().printMessage(Kind.ERROR, "Option field cannot be declared in the unnamed package", element);
              return;
          }
          List<String> helpValue = getAnnotationValueList(annotation, "help", String.class);
          String help = "";
--- 172,182 ----
                  processingEnv.getMessager().printMessage(Kind.ERROR, "Unexpected enclosing element kind: " + enclosing.getKind(), element);
                  return;
              }
              enclosing = enclosing.getEnclosingElement();
          }
!         if (enclosingPackage == null || enclosingPackage.isUnnamed()) {
              processingEnv.getMessager().printMessage(Kind.ERROR, "Option field cannot be declared in the unnamed package", element);
              return;
          }
          List<String> helpValue = getAnnotationValueList(annotation, "help", String.class);
          String help = "";