Handle a couple of GCC 13 warnings about dangling references

There are two temporaries, reply.arguments() returns a temporary QList
and list.at(0) returns a temporary reference to the first element. The
local reference variable would only extend the lifetime of the temporary
object it's bound to, list.at(0), but not the temporary list itself.
Even though this a false positive in this case because QList is
implicilty shared, the compiler can't tell the difference and the fix is
simple.

tests/auto/dbus/qdbusabstractadaptor/tst_qdbusabstractadaptor.cpp:1845:21:
warning: possibly dangling reference to a temporary
[-Wdangling-reference]
 1845 |     const QVariant &retval = reply.arguments().at(0);
      |                     ^~~~~~
tests/auto/dbus/qdbusabstractadaptor/tst_qdbusabstractadaptor.cpp:1845:50:
note: the temporary was destroyed at the end of the full expression
‘QDBusMessage::arguments() const().QList<QVariant>::at(0)’
 1845 |     const QVariant &retval = reply.arguments().at(0);
      |                              ~~~~~~~~~~~~~~~~~~~~^~~

Pick-to: 6.6 6.5 5.15
Change-Id: I03d54b56769cbd0f9f1165e4679ec4947267181a
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/auto/corelib/thread/qfuturesynchronizer/tst_qfuturesynchronizer.cpp b/tests/auto/corelib/thread/qfuturesynchronizer/tst_qfuturesynchronizer.cpp
index e198bb931e..0602afc970 100644
--- a/tests/auto/corelib/thread/qfuturesynchronizer/tst_qfuturesynchronizer.cpp
+++ b/tests/auto/corelib/thread/qfuturesynchronizer/tst_qfuturesynchronizer.cpp
@@ -50,7 +50,12 @@ void tst_QFutureSynchronizer::setFutureAliasingExistingMember()
         // around to avoid the warning, as the extra copy would cause a detach()
         // of m_futures inside setFuture() with the consequence that `f` no longer
         // aliases an element in m_futures, which is the goal of this test.
+QT_WARNING_PUSH
+#if defined(Q_CC_GNU_ONLY) && Q_CC_GNU >= 1301
+QT_WARNING_DISABLE_GCC("-Wdangling-reference")
+#endif
         const auto &f = synchronizer.futures().constFirst();
+QT_WARNING_POP
         synchronizer.setFuture(f);
     }