1 files changed, 27 insertions, 10 deletions
diff --git a/qmake/library/qmakevfs.cpp b/qmake/library/qmakevfs.cpp
index 265f1e60d3..9fd6ae470c 100644
--- a/qmake/library/qmakevfs.cpp
+++ b/qmake/library/qmakevfs.cpp
@@ -52,11 +52,38 @@ QMakeVfs::QMakeVfs()
 #if QT_CONFIG(textcodec)
     m_textCodec = 0;
 #endif
+    ref();
+}
+
+QMakeVfs::~QMakeVfs()
+{
+    deref();
+}
+
+void QMakeVfs::ref()
+{
+#ifdef PROEVALUATOR_THREAD_SAFE
+    QMutexLocker locker(&s_mutex);
+#endif
+    ++s_refCount;
+}
+
+void QMakeVfs::deref()
+{
+#ifdef PROEVALUATOR_THREAD_SAFE
+    QMutexLocker locker(&s_mutex);
+#endif
+    if (!--s_refCount) {
+        s_fileIdCounter = 0;
+        s_fileIdMap.clear();
+        s_idFileMap.clear();
+    }
 }
 
 #ifdef PROPARSER_THREAD_SAFE
 QMutex QMakeVfs::s_mutex;
 #endif
+int QMakeVfs::s_refCount;
 QAtomicInt QMakeVfs::s_fileIdCounter;
 QHash<QString, int> QMakeVfs::s_fileIdMap;
 QHash<int, QString> QMakeVfs::s_idFileMap;
@@ -114,16 +141,6 @@ QString QMakeVfs::fileNameForId(int id)
     return s_idFileMap.value(id);
 }
 
-void QMakeVfs::clearIds()
-{
-#ifdef PROEVALUATOR_THREAD_SAFE
-    QMutexLocker locker(&s_mutex);
-#endif
-    s_fileIdCounter = 0;
-    s_fileIdMap.clear();
-    s_idFileMap.clear();
-}
-
 bool QMakeVfs::writeFile(int id, QIODevice::OpenMode mode, VfsFlags flags,
                          const QString &contents, QString *errStr)
 {