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, 2 insertions, 2 deletions

diff --git a/src/corelib/tools/qunicodetools.cpp b/src/corelib/tools/qunicodetools.cpp
index fad4267edc..be1d88e260 100644
--- a/src/corelib/tools/qunicodetools.cpp
+++ b/src/corelib/tools/qunicodetools.cpp
@@ -522,13 +522,13 @@ static void getLineBreaks(const ushort *string, quint32 len, QCharAttributes *at
                 // do not change breaks before and after the expression
                 for (quint32 j = nestart + 1; j < pos; ++j)
                     attributes[j].lineBreak = false;
-                // fall through
+                Q_FALLTHROUGH();
             case LB::NS::None:
                 nelast = LB::NS::XX; // reset state
                 break;
             case LB::NS::Start:
                 nestart = i;
-                // fall through
+                Q_FALLTHROUGH();
             default:
                 nelast = necur;
                 break;