Logging: support %{backtrace} in QT_MESSAGE_PATTERN

On supported platform, allow to show a backtrace by using
%{backtrace} or %{backtrace depth=N separator="|"}

[ChangeLog][QtCore][Logging] QT_MESSAGE_PATTERN can include a
backtrace using %{backtrace}

Change-Id: Ib00418c070d3bd6fe846dc04bf69fa91ba64f9cd
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

2 files changed, 34 insertions, 0 deletions

diff --git a/tests/auto/corelib/global/qlogging/app/app.pro b/tests/auto/corelib/global/qlogging/app/app.pro
index 24ac571bac..b11e792a4c 100644
--- a/tests/auto/corelib/global/qlogging/app/app.pro
+++ b/tests/auto/corelib/global/qlogging/app/app.pro
@@ -10,3 +10,6 @@ CONFIG += console
 
 SOURCES += main.cpp
 DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0
+
+gcc:!mingw: QMAKE_LFLAGS += -rdynamic
+
diff --git a/tests/auto/corelib/global/qlogging/app/main.cpp b/tests/auto/corelib/global/qlogging/app/main.cpp
index 621059caad..e190a48873 100644
--- a/tests/auto/corelib/global/qlogging/app/main.cpp
+++ b/tests/auto/corelib/global/qlogging/app/main.cpp
@@ -42,11 +42,37 @@
 #include <QCoreApplication>
 #include <QLoggingCategory>
 
+#ifdef Q_CC_GNU
+#define NEVER_INLINE __attribute__((__noinline__))
+#else
+#define NEVER_INLINE
+#endif
+
 struct T {
     T() { qDebug("static constructor"); }
     ~T() { qDebug("static destructor"); }
 } t;
 
+class MyClass : public QObject
+{
+    Q_OBJECT
+public slots:
+    virtual NEVER_INLINE QString mySlot1();
+private:
+    virtual NEVER_INLINE void myFunction(int a);
+};
+
+QString MyClass::mySlot1()
+{
+    myFunction(34);
+    return QString();
+}
+
+void MyClass::myFunction(int a)
+{
+    qDebug() << "from_a_function" << a;
+}
+
 int main(int argc, char **argv)
 {
     QCoreApplication app(argc, argv);
@@ -65,5 +91,10 @@ int main(int argc, char **argv)
 
     qDebug("qDebug2");
 
+    MyClass cl;
+    QMetaObject::invokeMethod(&cl, "mySlot1");
+
     return 0;
 }
+
+#include "main.moc"