8 files changed, 10 insertions, 10 deletions
diff --git a/src/tools/qdoc/doc.h b/src/tools/qdoc/doc.h
index 2c007b9de9a..80d47287bb1 100644
--- a/src/tools/qdoc/doc.h
+++ b/src/tools/qdoc/doc.h
@@ -64,7 +64,7 @@ struct Topic
     QString topic;
     QString args;
     Topic() { }
-    Topic(QString& t, QString a) : topic(t), args(a) { }
+    Topic(QString& t, const QString &a) : topic(t), args(a) { }
     bool isEmpty() const { return topic.isEmpty(); }
     void clear() { topic.clear(); args.clear(); }
 };
diff --git a/src/tools/qdoc/doc/examples/mainwindow.cpp b/src/tools/qdoc/doc/examples/mainwindow.cpp
index 6a03a8e8f29..68b878c07ed 100644
--- a/src/tools/qdoc/doc/examples/mainwindow.cpp
+++ b/src/tools/qdoc/doc/examples/mainwindow.cpp
@@ -136,7 +136,7 @@ void MainWindow::createActions()
     openAct->setShortcuts(QKeySequence::Open);
     connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
 
-    foreach (QByteArray format, QImageWriter::supportedImageFormats()) {
+    foreach (const QByteArray &format, QImageWriter::supportedImageFormats()) {
         QString text = tr("%1...").arg(QString(format).toUpper());
 
         QAction *action = new QAction(text, this);
diff --git a/src/tools/qdoc/htmlgenerator.cpp b/src/tools/qdoc/htmlgenerator.cpp
index d422356822c..f4ada7132f9 100644
--- a/src/tools/qdoc/htmlgenerator.cpp
+++ b/src/tools/qdoc/htmlgenerator.cpp
@@ -3190,7 +3190,7 @@ void HtmlGenerator::generateList(const Node* relative, CodeMarker* marker, const
 
 #if 0
     QStringList keys = groups.uniqueKeys();
-    foreach (QString key, keys) {
+    foreach (const QString &key, keys) {
         GroupNode* gn = static_cast<GroupNode*>(groups.value(key));
         if (gn) {
             out() << QString("<h3><a href=\"%1\">%2</a></h3>\n").arg(
@@ -3217,7 +3217,7 @@ void HtmlGenerator::generateList(const Node* relative, CodeMarker* marker, const
 
             out() << "<ul>\n";
             QStringList titles = nm.keys();
-            foreach (QString t, titles) {
+            foreach (const QString &t, titles) {
                 Node* member = nm.value(t);
                 QString title = member->fullTitle();
                 if (title.startsWith("The "))
@@ -4484,7 +4484,7 @@ void HtmlGenerator::generateManifestFiles()
   for each manifest file to be generated. \a manifest is the
   type of manifest file.
  */
-void HtmlGenerator::generateManifestFile(QString manifest, QString element)
+void HtmlGenerator::generateManifestFile(const QString &manifest, const QString &element)
 {
     ExampleNodeMap& exampleNodeMap = qdb_->exampleNodeMap();
     if (exampleNodeMap.isEmpty())
diff --git a/src/tools/qdoc/htmlgenerator.h b/src/tools/qdoc/htmlgenerator.h
index 9645219933c..44408c0eb2a 100644
--- a/src/tools/qdoc/htmlgenerator.h
+++ b/src/tools/qdoc/htmlgenerator.h
@@ -104,7 +104,7 @@ protected:
     virtual QString refForNode(const Node *node);
     virtual QString linkForNode(const Node *node, const Node *relative);
 
-    void generateManifestFile(QString manifest, QString element);
+    void generateManifestFile(const QString &manifest, const QString &element);
     void readManifestMetaContent(const Config &config);
     void generateKeywordAnchors(const Node* node);
 
diff --git a/src/tools/qdoc/node.cpp b/src/tools/qdoc/node.cpp
index 2d38720a36e..b00276a58ce 100644
--- a/src/tools/qdoc/node.cpp
+++ b/src/tools/qdoc/node.cpp
@@ -2474,7 +2474,7 @@ QString Node::fullDocumentName() const
   be used as the value of an \e id attribute. Search for NCName
   on the internet for details of what can be an NCName.
  */
-QString Node::cleanId(QString str)
+QString Node::cleanId(const QString &str)
 {
     QString clean;
     QString name = str.simplified();
diff --git a/src/tools/qdoc/node.h b/src/tools/qdoc/node.h
index df41aa00ff4..610ab0875e5 100644
--- a/src/tools/qdoc/node.h
+++ b/src/tools/qdoc/node.h
@@ -305,7 +305,7 @@ public:
     const QString& outputSubdirectory() const { return outSubDir_; }
     void setOutputSubdirectory(const QString& t) { outSubDir_ = t; }
     QString fullDocumentName() const;
-    static QString cleanId(QString str);
+    static QString cleanId(const QString &str);
     QString idForNode() const;
 
     static FlagValue toFlagValue(bool b);
diff --git a/src/tools/qdoc/qdocdatabase.cpp b/src/tools/qdoc/qdocdatabase.cpp
index cad213df90b..4f1a38d1892 100644
--- a/src/tools/qdoc/qdocdatabase.cpp
+++ b/src/tools/qdoc/qdocdatabase.cpp
@@ -1549,7 +1549,7 @@ void QDocDatabase::mergeCollections(Node::Type nt, CNMap& cnm, const Node* relat
     if (cnmm.isEmpty())
         return;
     QStringList keys = cnmm.uniqueKeys();
-    foreach (QString key, keys) {
+    foreach (const QString &key, keys) {
         QList<CollectionNode*> values = cnmm.values(key);
         CollectionNode* n = 0;
         foreach (CollectionNode* v, values) {
diff --git a/src/tools/qdoc/qdocindexfiles.cpp b/src/tools/qdoc/qdocindexfiles.cpp
index 240704e1f95..efc0eb1e0f2 100644
--- a/src/tools/qdoc/qdocindexfiles.cpp
+++ b/src/tools/qdoc/qdocindexfiles.cpp
@@ -542,7 +542,7 @@ void QDocIndexFiles::readIndexSection(const QDomElement& element,
     QString groupsAttr = element.attribute("groups");
     if (!groupsAttr.isEmpty()) {
         QStringList groupNames = groupsAttr.split(",");
-        foreach (QString name, groupNames) {
+        foreach (const QString &name, groupNames) {
             qdb_->addToGroup(name, node);
         }
     }