The editor shows orange triangles next to lines that would cause a warning when the appropriate compiler flag is given, i.e. if (my_qreal == 0.0) would trigger this and show the following in the tooltip:

Warning: comparing floating point with == or != is unsafe (-Wfloat-equal)"

It would be nice to get an overview of all those messages, without the need to inspect every line or every file in the project. Something similar to the 'To-Do Entries' where you can specify the scope of the messages to show, but then not for specific patterns, but for these warning messages.