Support C++17 fallthrough attribute

Replaces our mix of comments for annotating intended absence of break
in switches with the C++17 attribute [[fallthrough]], or its earlier
a clang extension counterpart.

Change-Id: I4b2d0b9b5e4425819c7f1bf01608093c536b6d14
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/dbus/qdbusmetatype.cpp b/src/dbus/qdbusmetatype.cpp
index 59a71ade3e..fb2b407997 100644
--- a/src/dbus/qdbusmetatype.cpp
+++ b/src/dbus/qdbusmetatype.cpp
@@ -373,7 +373,7 @@ int QDBusMetaType::signatureToType(const char *signature)
             return qMetaTypeId<QList<QDBusSignature> >();
 
         }
-        // fall through
+        Q_FALLTHROUGH();
     default:
         return QMetaType::UnknownType;
     }