Make Qt4ProejctManager::MakeStep::run multithreading safe

Change-Id: I416360d35681d2721878cb9fefd861d6e1f209b4
Reviewed-on: http://codereview.qt-project.org/5451
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/projectexplorer/abstractprocessstep.cpp

@@ -152,6 +152,11 @@ ProjectExplorer::IOutputParser *AbstractProcessStep::outputParser() const
     return m_outputParserChain;
 }
 
+bool AbstractProcessStep::ignoreReturnValue()
+{
+    return m_ignoreReturnValue;
+}
+
 /*!
     \brief If ignoreReturnValue is set to true, then the abstractprocess step will
     return success even if the return value indicates otherwise.

src/plugins/projectexplorer/abstractprocessstep.h

@@ -68,12 +68,12 @@ public:
 
     ProcessParameters *processParameters() { return &m_param; }
 
+    bool ignoreReturnValue();
     void setIgnoreReturnValue(bool b);
 
     void setOutputParser(ProjectExplorer::IOutputParser *parser);
     void appendOutputParser(ProjectExplorer::IOutputParser *parser);
     ProjectExplorer::IOutputParser *outputParser() const;
-
 protected:
     AbstractProcessStep(BuildStepList *bsl, const QString &id);
     AbstractProcessStep(BuildStepList *bsl, AbstractProcessStep *bs);

src/plugins/qt4projectmanager/makestep.cpp

@@ -229,9 +229,9 @@ void MakeStep::run(QFutureInterface<bool> & fi)
     }
 
     if (!QFileInfo(m_makeFileToCheck).exists()) {
-        if (!m_clean)
+        if (!ignoreReturnValue())
             emit addOutput(tr("Cannot find Makefile. Check your build settings."), BuildStep::MessageOutput);
-        fi.reportResult(m_clean);
+        fi.reportResult(ignoreReturnValue());
         return;
     }