Fix that changing qmake arguments did not update the import label

Task-Nr: QTCREATOR-269

src/plugins/qt4projectmanager/qmakestep.cpp

@@ -210,8 +210,13 @@ bool QMakeStep::processFinished(int exitCode, QProcess::ExitStatus status)
 
 void QMakeStep::setUserArguments(const QStringList &arguments)
 {
+    if (m_userArgs == arguments)
+        return;
     m_userArgs = arguments;
+
     emit userArgumentsChanged();
+
+    qt4BuildConfiguration()->emitQMakeBuildConfigurationChanged();
 }
 
 QStringList QMakeStep::userArguments()

src/plugins/qt4projectmanager/qt4buildconfiguration.cpp

@@ -316,6 +316,11 @@ void Qt4BuildConfiguration::setQMakeBuildConfiguration(QtVersion::QmakeBuildConf
     emit targetInformationChanged();
 }
 
+void Qt4BuildConfiguration::emitQMakeBuildConfigurationChanged()
+{
+    emit qmakeBuildConfigurationChanged();
+}
+
 void Qt4BuildConfiguration::getConfigCommandLineArguments(QStringList *addedUserConfigs, QStringList *removedUserConfigs) const
 {
     QtVersion::QmakeBuildConfigs defaultBuildConfiguration = qtVersion()->defaultBuildConfig();

src/plugins/qt4projectmanager/qt4buildconfiguration.h

@@ -90,6 +90,9 @@ public:
 
     QtVersion::QmakeBuildConfigs qmakeBuildConfiguration() const;
     void setQMakeBuildConfiguration(QtVersion::QmakeBuildConfigs config);
+    // used by qmake step to notify that the qmake args have changed
+    // not really nice
+    void emitQMakeBuildConfigurationChanged();
     void getConfigCommandLineArguments(QStringList *addedUserConfigs, QStringList *removedUserConfigs) const;
 
     // Those functions are used in a few places.