diff --git a/gui/checkthread.cpp b/gui/checkthread.cpp
index 228d1bd35..f444241e7 100644
--- a/gui/checkthread.cpp
+++ b/gui/checkthread.cpp
@@ -37,14 +37,35 @@ CheckThread::~CheckThread()
 
 void CheckThread::Check(const Settings &settings)
 {
+    mFiles.clear();
     mCppcheck.settings() = settings;
     start();
 }
 
+void CheckThread::AnalyseWholeProgram(const QStringList &files)
+{
+    mFiles = files;
+    start();
+}
+
 void CheckThread::run()
 {
     mState = Running;
 
+    if (!mFiles.isEmpty()) {
+        qDebug() << "Whole program analysis";
+        const std::string &buildDir = mCppcheck.settings().buildDir;
+        if (!buildDir.empty()) {
+            std::map<std::string,std::size_t> files2;
+            for (QString file : mFiles)
+                files2[file.toStdString()] = 0;
+            mCppcheck.analyseWholeProgram(buildDir, files2);
+        }
+        mFiles.clear();
+        emit Done();
+        return;
+    }
+
     QString file = mResult.GetNextFile();
     while (!file.isEmpty() && mState == Running) {
         qDebug() << "Checking file" << file;
diff --git a/gui/checkthread.h b/gui/checkthread.h
index fcc397eae..903b1b8f0 100644
--- a/gui/checkthread.h
+++ b/gui/checkthread.h
@@ -46,6 +46,12 @@ public:
     */
     void Check(const Settings &settings);
 
+    /**
+    * @brief Run whole program analysis
+    * @param files    All files
+    */
+    void AnalyseWholeProgram(const QStringList &files);
+
     /**
     * @brief method that is run in a thread
     *
@@ -91,7 +97,9 @@ protected:
     *
     */
     CppCheck mCppcheck;
+
 private:
+    QStringList mFiles;
 };
 /// @}
 #endif // CHECKTHREAD_H
diff --git a/gui/mainwindow.cpp b/gui/mainwindow.cpp
index 234ca6bb1..7335cd4be 100644
--- a/gui/mainwindow.cpp
+++ b/gui/mainwindow.cpp
@@ -438,6 +438,20 @@ void MainWindow::DoCheckFiles(const QStringList &files)
     if (mProject)
         qDebug() << "Checking project file" << mProject->GetProjectFile()->GetFilename();
 
+    if (!checkSettings.buildDir.empty()) {
+        QString s = QString::fromStdString(checkSettings.buildDir);
+        if (!s.endsWith('/'))
+            s += '/';
+        s += "files.txt";
+
+        std::ofstream fout(s.toStdString());
+        if (fout.is_open()) {
+            foreach (QString f, fileNames) {
+                fout << f.toStdString() << '\n';
+            }
+        }
+    }
+
     mThread->SetCheckFiles(true);
     mThread->Check(checkSettings, true);
 }
@@ -742,6 +756,12 @@ Settings MainWindow::GetCppcheckSettings()
         // Only check the given -D configuration
         if (!defines.isEmpty())
             result.maxConfigs = 1;
+
+        QString buildDir = pfile->GetBuildDir();
+        if (!buildDir.isEmpty()) {
+            QString prjpath = QFileInfo(pfile->GetFilename()).absolutePath();
+            result.buildDir = (prjpath + '/' + buildDir).toStdString();
+        }
     }
 
     // Include directories (and files) are searched in listed order.
@@ -759,6 +779,8 @@ Settings MainWindow::GetCppcheckSettings()
     result.addEnabled("portability");
     result.addEnabled("information");
     result.addEnabled("missingInclude");
+    if (!result.buildDir.empty())
+        result.addEnabled("unusedFunction");
     result.debug = false;
     result.debugwarnings = mSettings->value(SETTINGS_SHOW_DEBUG_WARNINGS, false).toBool();
     result.quiet = false;
diff --git a/gui/project.cpp b/gui/project.cpp
index 67060b557..14af3f02d 100644
--- a/gui/project.cpp
+++ b/gui/project.cpp
@@ -86,53 +86,40 @@ bool Project::Open()
 bool Project::Edit()
 {
     ProjectFileDialog dlg(mFilename, mParentWidget);
-    QString root = mPFile->GetRootPath();
-    dlg.SetRootPath(root);
-    QStringList includes = mPFile->GetIncludeDirs();
-    dlg.SetIncludepaths(includes);
-    QStringList defines = mPFile->GetDefines();
-    dlg.SetDefines(defines);
-    QStringList paths = mPFile->GetCheckPaths();
-    dlg.SetPaths(paths);
-    QString importProject = mPFile->GetImportProject();
-    dlg.SetImportProject(importProject);
-    QStringList ignorepaths = mPFile->GetExcludedPaths();
-    dlg.SetExcludedPaths(ignorepaths);
-    QStringList libraries = mPFile->GetLibraries();
-    dlg.SetLibraries(libraries);
-    QStringList suppressions = mPFile->GetSuppressions();
-    dlg.SetSuppressions(suppressions);
+    dlg.SetRootPath(mPFile->GetRootPath());
+    dlg.SetBuildDir(mPFile->GetBuildDir());
+    dlg.SetIncludepaths(mPFile->GetIncludeDirs());
+    dlg.SetDefines(mPFile->GetDefines());
+    dlg.SetPaths(mPFile->GetCheckPaths());
+    dlg.SetImportProject(mPFile->GetImportProject());
+    dlg.SetExcludedPaths(mPFile->GetExcludedPaths());
+    dlg.SetLibraries(mPFile->GetLibraries());
+    dlg.SetSuppressions(mPFile->GetSuppressions());
 
-    int rv = dlg.exec();
-    if (rv == QDialog::Accepted) {
-        QString root = dlg.GetRootPath();
-        mPFile->SetRootPath(root);
-        mPFile->SetImportProject(dlg.GetImportProject());
-        QStringList includes = dlg.GetIncludePaths();
-        mPFile->SetIncludes(includes);
-        QStringList defines = dlg.GetDefines();
-        mPFile->SetDefines(defines);
-        QStringList paths = dlg.GetPaths();
-        mPFile->SetCheckPaths(paths);
-        QStringList excludedpaths = dlg.GetExcludedPaths();
-        mPFile->SetExcludedPaths(excludedpaths);
-        QStringList libraries = dlg.GetLibraries();
-        mPFile->SetLibraries(libraries);
-        QStringList suppressions = dlg.GetSuppressions();
-        mPFile->SetSuppressions(suppressions);
+    if (dlg.exec() != QDialog::Accepted)
+        return false;
 
-        bool writeSuccess = mPFile->Write();
-        if (!writeSuccess) {
-            QMessageBox msg(QMessageBox::Critical,
-                            tr("Cppcheck"),
-                            tr("Could not write the project file."),
-                            QMessageBox::Ok,
-                            mParentWidget);
-            msg.exec();
-        }
-        return writeSuccess;
+    mPFile->SetRootPath(dlg.GetRootPath());
+    mPFile->SetBuildDir(dlg.GetBuildDir());
+    mPFile->SetImportProject(dlg.GetImportProject());
+    mPFile->SetIncludes(dlg.GetIncludePaths());
+    mPFile->SetDefines(dlg.GetDefines());
+    mPFile->SetCheckPaths(dlg.GetPaths());
+    mPFile->SetExcludedPaths(dlg.GetExcludedPaths());
+    mPFile->SetLibraries(dlg.GetLibraries());
+    mPFile->SetSuppressions(dlg.GetSuppressions());
+
+    if (!mPFile->Write()) {
+        QMessageBox msg(QMessageBox::Critical,
+                        tr("Cppcheck"),
+                        tr("Could not write the project file."),
+                        QMessageBox::Ok,
+                        mParentWidget);
+        msg.exec();
+        return false;
     }
-    return false;
+
+    return true;
 }
 
 void Project::Create()
diff --git a/gui/projectfile.cpp b/gui/projectfile.cpp
index e00a4a4c7..e21529540 100644
--- a/gui/projectfile.cpp
+++ b/gui/projectfile.cpp
@@ -27,6 +27,7 @@
 static const char ProjectElementName[] = "project";
 static const char ProjectVersionAttrib[] = "version";
 static const char ProjectFileVersion[] = "1";
+static const char BuildDirElementName[] = "builddir";
 static const char ImportProjectElementName[] = "importproject";
 static const char IncludeDirElementName[] = "includedir";
 static const char DirElementName[] = "dir";
@@ -84,6 +85,10 @@ bool ProjectFile::Read(const QString &filename)
             if (insideProject && xmlReader.name() == RootPathName)
                 ReadRootPath(xmlReader);
 
+            // Read root path from inside project element
+            if (insideProject && xmlReader.name() == BuildDirElementName)
+                ReadBuildDir(xmlReader);
+
             // Find paths to check from inside project element
             if (insideProject && xmlReader.name() == PathsElementName)
                 ReadCheckPaths(xmlReader);
@@ -152,6 +157,31 @@ void ProjectFile::ReadRootPath(QXmlStreamReader &reader)
         mRootPath = name;
 }
 
+void ProjectFile::ReadBuildDir(QXmlStreamReader &reader)
+{
+    mBuildDir.clear();
+    do {
+        const QXmlStreamReader::TokenType type = reader.readNext();
+        switch (type) {
+        case QXmlStreamReader::Characters:
+            mBuildDir = reader.text().toString();
+        case QXmlStreamReader::EndElement:
+            return;
+        // Not handled
+        case QXmlStreamReader::StartElement:
+        case QXmlStreamReader::NoToken:
+        case QXmlStreamReader::Invalid:
+        case QXmlStreamReader::StartDocument:
+        case QXmlStreamReader::EndDocument:
+        case QXmlStreamReader::Comment:
+        case QXmlStreamReader::DTD:
+        case QXmlStreamReader::EntityReference:
+        case QXmlStreamReader::ProcessingInstruction:
+            break;
+        }
+    } while (1);
+}
+
 void ProjectFile::ReadImportProject(QXmlStreamReader &reader)
 {
     mImportProject.clear();
@@ -426,6 +456,12 @@ bool ProjectFile::Write(const QString &filename)
         xmlWriter.writeEndElement();
     }
 
+    if (!mBuildDir.isEmpty()) {
+        xmlWriter.writeStartElement(BuildDirElementName);
+        xmlWriter.writeCharacters(mBuildDir);
+        xmlWriter.writeEndElement();
+    }
+
     if (!mImportProject.isEmpty()) {
         xmlWriter.writeStartElement(ImportProjectElementName);
         xmlWriter.writeCharacters(mImportProject);
diff --git a/gui/projectfile.h b/gui/projectfile.h
index 0b9a162b2..44b5e8f2f 100644
--- a/gui/projectfile.h
+++ b/gui/projectfile.h
@@ -54,6 +54,10 @@ public:
         return mRootPath;
     }
 
+    QString GetBuildDir() const {
+        return mBuildDir;
+    }
+
     QString GetImportProject() const {
         return mImportProject;
     }
@@ -122,6 +126,11 @@ public:
         mRootPath = rootpath;
     }
 
+
+    void SetBuildDir(const QString &buildDir) {
+        mBuildDir = buildDir;
+    }
+
     void SetImportProject(const QString &importProject) {
         mImportProject = importProject;
     }
@@ -193,6 +202,8 @@ protected:
      */
     void ReadRootPath(QXmlStreamReader &reader);
 
+    void ReadBuildDir(QXmlStreamReader &reader);
+
     /**
      * @brief Read importproject from XML.
      * @param reader XML stream reader.
@@ -251,6 +262,10 @@ private:
      */
     QString mRootPath;
 
+    /** Cppcheck build dir */
+    QString mBuildDir;
+
+    /** Visual studio project/solution , compile database */
     QString mImportProject;
 
     /**
diff --git a/gui/projectfile.ui b/gui/projectfile.ui
index f41868332..145b938d7 100644
--- a/gui/projectfile.ui
+++ b/gui/projectfile.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>615</width>
-    <height>357</height>
+    <width>635</width>
+    <height>368</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -41,6 +41,27 @@
          </item>
         </layout>
        </item>
+       <item>
+        <layout class="QHBoxLayout" name="horizontalLayout_9">
+         <item>
+          <widget class="QLabel" name="buildDirLabel">
+           <property name="text">
+            <string>Cppcheck build dir (optional)</string>
+           </property>
+          </widget>
+         </item>
+         <item>
+          <widget class="QLineEdit" name="buildDirEdit"/>
+         </item>
+         <item>
+          <widget class="QPushButton" name="buildDirBrowse">
+           <property name="text">
+            <string>...</string>
+           </property>
+          </widget>
+         </item>
+        </layout>
+       </item>
        <item>
         <spacer name="verticalSpacer_10">
          <property name="orientation">
diff --git a/gui/projectfiledialog.cpp b/gui/projectfiledialog.cpp
index 65f67ac87..8abb5bd5e 100644
--- a/gui/projectfiledialog.cpp
+++ b/gui/projectfiledialog.cpp
@@ -83,6 +83,7 @@ ProjectFileDialog::ProjectFileDialog(const QString &path, QWidget *parent)
     }
 
     connect(mUI.mButtons, SIGNAL(accepted()), this, SLOT(accept()));
+    connect(mUI.buildDirBrowse, SIGNAL(clicked()), this, SLOT(BrowseBuildDir()));
     connect(mUI.mBrowseCompileDatabase, SIGNAL(clicked()), this, SLOT(BrowseCompileDatabase()));
     connect(mUI.mBrowseVisualStudio, SIGNAL(clicked()), this, SLOT(BrowseVisualStudio()));
     connect(mUI.mBtnAddInclude, SIGNAL(clicked()), this, SLOT(AddIncludeDir()));
@@ -119,6 +120,38 @@ void ProjectFileDialog::SaveSettings() const
     settings.setValue(SETTINGS_PROJECT_DIALOG_HEIGHT, size().height());
 }
 
+
+QString ProjectFileDialog::getExistingDirectory(const QString &caption, bool trailingSlash) {
+    const QFileInfo inf(mFilePath);
+    const QString rootpath = inf.absolutePath();
+    QString selectedDir = QFileDialog::getExistingDirectory(this,
+                          caption,
+                          rootpath);
+
+    if (selectedDir.isEmpty())
+        return QString();
+
+    // Check if the path is relative to project file's path and if so
+    // make it a relative path instead of absolute path.
+    const QDir dir(rootpath);
+    const QString relpath(dir.relativeFilePath(selectedDir));
+    if (!relpath.startsWith("."))
+        selectedDir = relpath;
+
+    // Trailing slash..
+    if (trailingSlash && !selectedDir.endsWith('/'))
+        selectedDir += '/';
+
+    return selectedDir;
+}
+
+void ProjectFileDialog::BrowseBuildDir()
+{
+    const QString dir(getExistingDirectory(tr("Select Cppcheck build dir"), false));
+    if (!dir.isEmpty())
+        mUI.buildDirEdit->setText(dir);
+}
+
 void ProjectFileDialog::BrowseCompileDatabase()
 {
     const QFileInfo inf(mFilePath);
@@ -180,6 +213,10 @@ QString ProjectFileDialog::GetRootPath() const
     return root;
 }
 
+QString ProjectFileDialog::GetBuildDir() const {
+    return mUI.buildDirEdit->text();
+}
+
 QString ProjectFileDialog::GetImportProject() const
 {
     return mUI.mEditCompileDatabase->text() + mUI.mEditVisualStudio->text();
@@ -253,10 +290,12 @@ QStringList ProjectFileDialog::GetSuppressions() const
     return suppressions;
 }
 
-void ProjectFileDialog::SetRootPath(const QString &root)
-{
-    QString newroot = QDir::toNativeSeparators(root);
-    mUI.mEditProjectRoot->setText(newroot);
+void ProjectFileDialog::SetRootPath(const QString &root) {
+    mUI.mEditProjectRoot->setText(QDir::toNativeSeparators(root));
+}
+
+void ProjectFileDialog::SetBuildDir(const QString &buildDir) {
+    mUI.buildDirEdit->setText(buildDir);
 }
 
 void ProjectFileDialog::SetImportProject(const QString &importProject)
@@ -321,38 +360,16 @@ void ProjectFileDialog::SetSuppressions(const QStringList &suppressions)
 
 void ProjectFileDialog::AddIncludeDir()
 {
-    const QFileInfo inf(mFilePath);
-    const QString rootpath = inf.absolutePath();
-    QString selectedDir = QFileDialog::getExistingDirectory(this,
-                          tr("Select include directory"),
-                          rootpath);
-
-    if (!selectedDir.isEmpty()) {
-        // Check if the path is relative to project file's path and if so
-        // make it a relative path instead of absolute path.
-        const QDir dir(selectedDir);
-        QString absPath = dir.absolutePath();
-        if (absPath.startsWith(rootpath)) {
-            // Remove also the slash from begin of new relative path
-            selectedDir = absPath.remove(0, rootpath.length() + 1);
-        }
-        if (!selectedDir.endsWith("/"))
-            selectedDir += '/';
-        AddIncludeDir(selectedDir);
-    }
+    const QString dir = getExistingDirectory(tr("Select include directory"), true);
+    if (!dir.isEmpty())
+        AddIncludeDir(dir);
 }
 
 void ProjectFileDialog::AddPath()
 {
-    QFileInfo inf(mFilePath);
-    const QString rootpath = inf.absolutePath();
-    QString selectedDir = QFileDialog::getExistingDirectory(this,
-                          tr("Select a directory to check"),
-                          rootpath);
-
-    if (!selectedDir.isEmpty()) {
-        AddPath(selectedDir);
-    }
+    QString dir = getExistingDirectory(tr("Select a directory to check"), false);
+    if (!dir.isEmpty())
+        AddPath(dir);
 }
 
 void ProjectFileDialog::RemoveIncludeDir()
@@ -383,18 +400,9 @@ void ProjectFileDialog::RemovePath()
 
 void ProjectFileDialog::AddExcludePath()
 {
-    QFileInfo inf(mFilePath);
-    const QString rootpath = inf.absolutePath();
-
-    QString selectedDir = QFileDialog::getExistingDirectory(this,
-                          tr("Select directory to ignore"),
-                          rootpath);
-
-    if (!selectedDir.isEmpty()) {
-        if (!selectedDir.endsWith('/'))
-            selectedDir += '/';
-        AddExcludePath(selectedDir);
-    }
+    QString dir = getExistingDirectory(tr("Select directory to ignore"), true);
+    if (!dir.isEmpty())
+        AddExcludePath(dir);
 }
 
 void ProjectFileDialog::EditExcludePath()
diff --git a/gui/projectfiledialog.h b/gui/projectfiledialog.h
index c7e655b3f..08685d431 100644
--- a/gui/projectfiledialog.h
+++ b/gui/projectfiledialog.h
@@ -49,6 +49,9 @@ public:
 
     QString GetImportProject() const;
 
+    /** Get Cppcheck build dir */
+    QString GetBuildDir() const;
+
     /**
     * @brief Return include paths from the dialog control.
     * @return List of include paths.
@@ -91,6 +94,9 @@ public:
     */
     void SetRootPath(const QString &root);
 
+    /** Set build dir */
+    void SetBuildDir(const QString &buildDir);
+
     void SetImportProject(const QString &importProject);
 
     /**
@@ -131,6 +137,11 @@ public:
 
 protected slots:
 
+    /**
+    * @brief Browse for build dir.
+    */
+    void BrowseBuildDir();
+
     /**
     * @brief Browse for Visual Studio solution/project.
     */
@@ -247,6 +258,8 @@ private:
 
     /** @brief Library checkboxes */
     QList<QCheckBox*> mLibraryCheckboxes;
+
+    QString getExistingDirectory(const QString &caption, bool trailingSlash);
 };
 
 /// @}
diff --git a/gui/threadhandler.cpp b/gui/threadhandler.cpp
index 937be7407..8980f241e 100644
--- a/gui/threadhandler.cpp
+++ b/gui/threadhandler.cpp
@@ -29,7 +29,9 @@
 ThreadHandler::ThreadHandler(QObject *parent) :
     QObject(parent),
     mScanDuration(0),
-    mRunningThreadCount(0)
+    mRunningThreadCount(0),
+    mAnalyseWholeProgram(false)
+
 {
     SetThreadCount(1);
 }
@@ -43,6 +45,7 @@ void ThreadHandler::ClearFiles()
 {
     mLastFiles.clear();
     mResults.ClearFiles();
+    mAnalyseWholeProgram = false;
 }
 
 void ThreadHandler::SetFiles(const QStringList &files)
@@ -94,6 +97,8 @@ void ThreadHandler::Check(const Settings &settings, bool all)
     // Date and time when checking starts..
     mCheckStartTime = QDateTime::currentDateTime();
 
+    mAnalyseWholeProgram = true;
+
     mTime.start();
 }
 
@@ -137,10 +142,17 @@ void ThreadHandler::RemoveThreads()
     }
 
     mThreads.clear();
+    mAnalyseWholeProgram = false;
 }
 
 void ThreadHandler::ThreadDone()
 {
+    if (mRunningThreadCount == 1 && mAnalyseWholeProgram) {
+        mThreads[0]->AnalyseWholeProgram(mLastFiles);
+        mAnalyseWholeProgram = false;
+        return;
+    }
+
     mRunningThreadCount--;
     if (mRunningThreadCount == 0) {
         emit Done();
@@ -158,6 +170,7 @@ void ThreadHandler::ThreadDone()
 void ThreadHandler::Stop()
 {
     mCheckStartTime = QDateTime();
+    mAnalyseWholeProgram = false;
     for (int i = 0; i < mThreads.size(); i++) {
         mThreads[i]->stop();
     }
diff --git a/gui/threadhandler.h b/gui/threadhandler.h
index 4a5020347..ce2f1baf8 100644
--- a/gui/threadhandler.h
+++ b/gui/threadhandler.h
@@ -234,6 +234,8 @@ protected:
     *
     */
     int mRunningThreadCount;
+
+    bool mAnalyseWholeProgram;
 private:
 
     /**