diff --git a/src/plugins/debugger/cdb/cdbengine.cpp b/src/plugins/debugger/cdb/cdbengine.cpp
index 9c0a27bb6b2..d8210f0ee88 100644
--- a/src/plugins/debugger/cdb/cdbengine.cpp
+++ b/src/plugins/debugger/cdb/cdbengine.cpp
@@ -89,6 +89,7 @@ Q_DECLARE_METATYPE(Debugger::Internal::MemoryAgent*)
 
 enum { debug = 0 };
 enum { debugLocals = 0 };
+enum { debugSourceMapping = 0 };
 enum { debugWatches = 0 };
 enum { debugBreakpoints = 0 };
 
@@ -462,6 +463,19 @@ void CdbEngine::init()
     m_extensionMessageBuffer.clear();
     m_pendingBreakpointMap.clear();
     m_customSpecialStopData.clear();
+
+    // Create local list of mappings in native separators
+    m_sourcePathMappings.clear();
+    const QSharedPointer<GlobalDebuggerOptions> globalOptions = debuggerCore()->globalDebuggerOptions();
+    if (!globalOptions->sourcePathMap.isEmpty()) {
+        typedef GlobalDebuggerOptions::SourcePathMap::const_iterator SourcePathMapIterator;
+        m_sourcePathMappings.reserve(globalOptions->sourcePathMap.size());
+        const SourcePathMapIterator cend = globalOptions->sourcePathMap.constEnd();
+        for (SourcePathMapIterator it = globalOptions->sourcePathMap.constBegin(); it != cend; ++it) {
+            m_sourcePathMappings.push_back(SourcePathMapping(QDir::toNativeSeparators(it.key()),
+                                                             QDir::toNativeSeparators(it.value())));
+        }
+    }
     QTC_ASSERT(m_process.state() != QProcess::Running, Utils::SynchronousProcess::stopProcess(m_process); )
 }
 
@@ -2359,24 +2373,46 @@ void CdbEngine::attemptBreakpointSynchronization()
         postCommandSequence(CommandListBreakPoints);
 }
 
-QString CdbEngine::normalizeFileName(const QString &f)
+// Pass a file name through source mapping and normalize upper/lower case (for the editor
+// manager to correctly process it) and convert to clean path.
+CdbEngine::NormalizedSourceFileName CdbEngine::sourceMapNormalizeFileNameFromDebugger(const QString &f)
 {
-    QMap<QString, QString>::const_iterator it = m_normalizedFileCache.constFind(f);
+    // 1) Check cache.
+    QMap<QString, NormalizedSourceFileName>::const_iterator it = m_normalizedFileCache.constFind(f);
     if (it != m_normalizedFileCache.constEnd())
         return it.value();
-    const QString winF = QDir::toNativeSeparators(f);
-#ifdef Q_OS_WIN
-    QString normalized = winNormalizeFileName(winF);
-#else
-    QString normalized = winF;
-#endif
-    if (normalized.isEmpty()) { // At least upper case drive letter
-        normalized = winF;
-        if (normalized.size() > 2 && normalized.at(1) == QLatin1Char(':'))
-            normalized[0] = normalized.at(0).toUpper();
+    if (debugSourceMapping)
+        qDebug(">sourceMapNormalizeFileNameFromDebugger %s", qPrintable(f));
+    // Do we have source path mappings? ->Apply.
+    QString fileName = QDir::toNativeSeparators(f);
+    if (!m_sourcePathMappings.isEmpty()) {
+        foreach (const SourcePathMapping &m, m_sourcePathMappings) {
+            if (fileName.startsWith(m.first, Qt::CaseInsensitive)) {
+                fileName.replace(0, m.first.size(), m.second);
+                break;
+            }
+        }
     }
-    m_normalizedFileCache.insert(f, normalized);
-    return normalized;
+    // Up/lower case normalization according to Windows.
+#ifdef Q_OS_WIN
+    QString normalized = winNormalizeFileName(fileName);
+#else
+    QString normalized = fileName;
+#endif
+    if (debugSourceMapping)
+        qDebug(" sourceMapNormalizeFileNameFromDebugger %s->%s", qPrintable(fileName), qPrintable(normalized));
+    // Check if it really exists, that is normalize worked and QFileInfo confirms it.
+    const bool exists = !normalized.isEmpty() && QFileInfo(normalized).isFile();
+    NormalizedSourceFileName result(QDir::cleanPath(normalized.isEmpty() ? fileName : normalized), exists);
+    if (!exists) {
+        // At least upper case drive letter if failed.
+        if (result.fileName.size() > 2 && result.fileName.at(1) == QLatin1Char(':'))
+            result.fileName[0] = result.fileName.at(0).toUpper();
+    }
+    m_normalizedFileCache.insert(f, result);
+    if (debugSourceMapping)
+        qDebug("<sourceMapNormalizeFileNameFromDebugger %s %d", qPrintable(result.fileName), result.exists);
+    return result;
 }
 
 // Parse frame from GDBMI. Duplicate of the gdb code, but that
@@ -2394,7 +2430,7 @@ static StackFrames parseFrames(const GdbMi &gdbmi)
         if (fullName.isValid()) {
             frame.file = QFile::decodeName(fullName.data());
             frame.line = frameMi.findChild("line").data().toInt();
-            frame.usable = QFileInfo(frame.file).isFile();
+            frame.usable = false; // To be decided after source path mapping.
         }
         frame.function = QLatin1String(frameMi.findChild("func").data());
         frame.from = QLatin1String(frameMi.findChild("from").data());
@@ -2422,7 +2458,9 @@ unsigned CdbEngine::parseStackTrace(const GdbMi &data, bool sourceStepInto)
             return ParseStackStepInto;
         }
         if (hasFile) {
-            frames[i].file = QDir::cleanPath(normalizeFileName(frames.at(i).file));
+            const NormalizedSourceFileName fileName = sourceMapNormalizeFileNameFromDebugger(frames.at(i).file);
+            frames[i].file = fileName.fileName;
+            frames[i].usable = fileName.exists;
             if (current == -1 && frames[i].usable)
                 current = i;
         }
diff --git a/src/plugins/debugger/cdb/cdbengine.h b/src/plugins/debugger/cdb/cdbengine.h
index 40968fd209a..4e024d0e52c 100644
--- a/src/plugins/debugger/cdb/cdbengine.h
+++ b/src/plugins/debugger/cdb/cdbengine.h
@@ -42,6 +42,8 @@
 #include <QtCore/QVariantList>
 #include <QtCore/QMap>
 #include <QtCore/QTime>
+#include <QtCore/QPair>
+#include <QtCore/QList>
 
 namespace Utils {
 class ConsoleProcess;
@@ -164,6 +166,14 @@ private slots:
 
 private:
     typedef QHash<BreakpointId, BreakpointResponse> PendingBreakPointMap;
+    typedef QPair<QString, QString> SourcePathMapping;
+    struct NormalizedSourceFileName // Struct for caching mapped/normalized source files.
+    {
+        NormalizedSourceFileName(const QString &fn = QString(), bool e = false) : fileName(fn), exists(e) {}
+
+        QString fileName;
+        bool exists;
+    };
 
     enum SpecialStopMode
     {
@@ -218,8 +228,7 @@ private:
     void handleWidgetAt(const CdbExtensionCommandPtr &);
     void handleBreakPoints(const CdbExtensionCommandPtr &);
     void handleBreakPoints(const GdbMi &value);
-
-    QString normalizeFileName(const QString &f);
+    NormalizedSourceFileName sourceMapNormalizeFileNameFromDebugger(const QString &f);
     void updateLocalVariable(const QByteArray &iname);
     void updateLocals(bool forNewStackFrame = false);
     int elapsedLogTime() const;
@@ -243,7 +252,7 @@ private:
     QList<CdbBuiltinCommandPtr> m_builtinCommandQueue;
     int m_currentBuiltinCommandIndex; //!< Current command whose output is recorded.
     QList<CdbExtensionCommandPtr> m_extensionCommandQueue;
-    QMap<QString, QString> m_normalizedFileCache;
+    QMap<QString, NormalizedSourceFileName> m_normalizedFileCache;
     const QByteArray m_extensionCommandPrefixBA; //!< Library name used as prefix
     bool m_operateByInstructionPending; //!< Creator operate by instruction action changed.
     bool m_operateByInstruction;
@@ -259,6 +268,7 @@ private:
     QHash<QString, QString> m_fileNameModuleHash;
     bool m_ignoreCdbOutput;
     QVariantList m_customSpecialStopData;
+    QList<SourcePathMapping> m_sourcePathMappings;
 };
 
 } // namespace Internal