use QApplication instance; set return values

App/main.cpp

@@ -36,11 +36,11 @@ int main(int argc, char* argv[])
     qRegisterMetaType<QVector<double>>("QVector<double>");
 
     QApplication app(argc, argv);
-    QApplication::setApplicationName("BornAgain");
-    QApplication::setApplicationVersion(GUI::Util::Path::getBornAgainVersionString());
-    QApplication::setOrganizationName("BornAgain");
+    app.setApplicationName("BornAgain");
+    app.setApplicationVersion(GUI::Util::Path::getBornAgainVersionString());
+    app.setOrganizationName("BornAgain");
 #ifndef Q_OS_MAC
-    QApplication::setWindowIcon(QIcon(":/images/BornAgain.ico"));
+    app.setWindowIcon(QIcon(":/images/BornAgain.ico"));
 #endif
 
     ApplicationSettings applicationSettings;
@@ -62,8 +62,9 @@ int main(int argc, char* argv[])
         win.loadProject(options.projectFile());
     win.show();
 
+    int ret = -1;
     try {
-        return QApplication::exec();
+        ret = app.exec();
     } catch (const std::exception& ex) {
         QMessageBox msgbox(QMessageBox::Critical, "BornAgain: fatal bug",
                            QString("Sorry, you encountered a fatal bug.\n"
@@ -72,5 +73,7 @@ int main(int argc, char* argv[])
                            + ex.what() + "\n",
                            QMessageBox::Ok, QApplication::activeWindow());
         msgbox.exec();
+        return 1;
     }
+    return ret;
 }