1 files changed, 9 insertions, 1 deletions
diff --git a/src/plugins/qt4projectmanager/qt4nodes.cpp b/src/plugins/qt4projectmanager/qt4nodes.cpp
index 0a801b3d80..e2ed24cadc 100644
--- a/src/plugins/qt4projectmanager/qt4nodes.cpp
+++ b/src/plugins/qt4projectmanager/qt4nodes.cpp
@@ -691,9 +691,17 @@ void Qt4ProFileNode::update()
 
     Qt4PriFileNode::update(fileForCurrentProject, reader);
 
+    QString qmakeCxx = reader->value(QLatin1String("QMAKE_CXX"));
+    if (qmakeCxx.isEmpty()) {
+        // macx-xcode mkspec resets the value of QMAKE_CXX.
+        // Unfortunately, we need a valid QMAKE_CXX to configure the parser.
+        qmakeCxx = QLatin1String("c++");
+    }
+
     // update other variables
     QHash<Qt4Variable, QStringList> newVarValues;
-    newVarValues[CxxCompilerVar] << reader->value(QLatin1String("QMAKE_CXX"));
+
+    newVarValues[CxxCompilerVar] << qmakeCxx;
     newVarValues[DefinesVar] = reader->values(QLatin1String("DEFINES"));
     newVarValues[IncludePathVar] = includePaths(reader);
     newVarValues[UiDirVar] = uiDirPaths(reader);