diff --git a/src/libs/qtcreatorcdbext/qtcreatorcdbextension.cpp b/src/libs/qtcreatorcdbext/qtcreatorcdbextension.cpp
index 2ceac6dd711..61c41de7615 100644
--- a/src/libs/qtcreatorcdbext/qtcreatorcdbextension.cpp
+++ b/src/libs/qtcreatorcdbext/qtcreatorcdbextension.cpp
@@ -700,7 +700,8 @@ static std::string dumplocalHelper(ExtensionCommandContext &exc,PCSTR args, int
         return std::string();
     }
     std::wstring value;
-    if (!dumpSimpleType(n->asSymbolGroupNode(), SymbolGroupValueContext(exc.dataSpaces(), exc.symbols()), &value, &std::string())) {
+    std::string tmp;
+    if (!dumpSimpleType(n->asSymbolGroupNode(), SymbolGroupValueContext(exc.dataSpaces(), exc.symbols()), &value, &tmp)) {
         *errorMessage = "Cannot dump " + iname;
         return std::string();
     }
diff --git a/src/libs/qtcreatorcdbext/symbolgroupvalue.cpp b/src/libs/qtcreatorcdbext/symbolgroupvalue.cpp
index cd55cc712c5..14c3732678b 100644
--- a/src/libs/qtcreatorcdbext/symbolgroupvalue.cpp
+++ b/src/libs/qtcreatorcdbext/symbolgroupvalue.cpp
@@ -228,8 +228,9 @@ SymbolAncestorInfo SymbolGroupValue::infoOfAncestor(const std::string &name) con
 SymbolGroupValue SymbolGroupValue::addSymbol(const ULONG64 address, const std::string &type) const
 {
     const std::string &pointerToType = pointedToSymbolName(address, type);
+    std::string tmp;
     if (SymbolGroupNode *ancestorNode =
-            node()->symbolGroup()->addSymbol(module(), pointerToType, "", "", &std::string())) {
+            node()->symbolGroup()->addSymbol(module(), pointerToType, "", "", &tmp)) {
         return SymbolGroupValue(ancestorNode, m_context);
     }
     if (isValid() && SymbolGroupValue::verbose) { // Do not report subsequent errors
@@ -2064,8 +2065,9 @@ static inline bool dumpQRegion(const SymbolGroupValue &v, std::wostream &str, vo
     namestr << "(" << info.prependQtGuiModule("QRegionPrivate *") << ")("
             << std::showbase << std::hex << d.pointerValue() << ')';
 
+    std::string tmp;
     SymbolGroupNode *qRegionPrivateNode
-            = v.node()->symbolGroup()->addSymbol(v.module(), namestr.str(), std::string(), &std::string());
+            = v.node()->symbolGroup()->addSymbol(v.module(), namestr.str(), std::string(), &tmp);
     if (!qRegionPrivateNode)
         return false;
 
@@ -2128,14 +2130,15 @@ static inline bool dumpQHostAddress(const SymbolGroupValue &v, std::wostream &st
     std::ostringstream namestr;
     namestr << '(' << info.prependQtNetworkModule("QHostAddressPrivate *") << ")("
             << std::showbase << std::hex << d.pointerValue() << ')';
+    std::string tmp;
     SymbolGroupNode *qHostAddressPrivateNode
-            = v.node()->symbolGroup()->addSymbol(v.module(), namestr.str(), std::string(), &std::string());
+            = v.node()->symbolGroup()->addSymbol(v.module(), namestr.str(), std::string(), &tmp);
     if (!qHostAddressPrivateNode)
         return false;
     const SymbolGroupValue qHostAddressPrivateValue = SymbolGroupValue(qHostAddressPrivateNode, v.context());
     const bool parsed = readPODFromMemory<bool>(qHostAddressPrivateValue.context().dataspaces,
                                                 qHostAddressPrivateValue["isParsed"].address(),
-                                                sizeof(bool), false, &std::string());
+                                                sizeof(bool), false, &tmp);
     if (parsed) {
         const int protocol = qHostAddressPrivateValue["protocol"].intValue(-1);
         if (protocol < 0) {
@@ -2888,7 +2891,8 @@ static bool dumpQVariant(const SymbolGroupValue &v, std::wostream &str, std::str
         if (const SymbolGroupValue mv = dataV.typeCast(vmType.c_str())) {
             SymbolGroupNode *mapNode = mv.node();
             std::wstring value;
-            if (dumpSimpleType(mapNode, dataV.context(), &value, &std::string())
+            std::string tmp;
+            if (dumpSimpleType(mapNode, dataV.context(), &value, &tmp)
                     == SymbolGroupNode::SimpleDumperOk) {
                 str << value;
                 if (specialInfoIn)
@@ -2903,7 +2907,8 @@ static bool dumpQVariant(const SymbolGroupValue &v, std::wostream &str, std::str
         if (const SymbolGroupValue vl = dataV.typeCast(vLType.c_str())) {
             SymbolGroupNode *vListNode = vl.node();
             std::wstring value;
-            if (dumpSimpleType(vListNode, dataV.context(), &value, &std::string())
+            std::string tmp;
+            if (dumpSimpleType(vListNode, dataV.context(), &value, &tmp)
                     == SymbolGroupNode::SimpleDumperOk) {
                 str << value;
                 if (specialInfoIn)
@@ -2929,7 +2934,8 @@ static bool dumpQVariant(const SymbolGroupValue &v, std::wostream &str, std::str
         if (const SymbolGroupValue sl = dataV.typeCast(qtInfo.prependQtCoreModule("QStringList *").c_str())) {
             SymbolGroupNode *listNode = sl.node();
             std::wstring value;
-            if (dumpSimpleType(listNode, dataV.context(), &value, &std::string())
+            std::string tmp;
+            if (dumpSimpleType(listNode, dataV.context(), &value, &tmp)
                     == SymbolGroupNode::SimpleDumperOk) {
                 str << value;
                 if (specialInfoIn)
diff --git a/src/plugins/debugger/shared/hostutils.cpp b/src/plugins/debugger/shared/hostutils.cpp
index 4f2fad99c6c..5a65d5a6ea7 100644
--- a/src/plugins/debugger/shared/hostutils.cpp
+++ b/src/plugins/debugger/shared/hostutils.cpp
@@ -193,7 +193,7 @@ bool isDebuggerWinException(unsigned long code)
     return code == EXCEPTION_BREAKPOINT || code == EXCEPTION_SINGLE_STEP;
 }
 
-bool isFatalWinException(long code)
+bool isFatalWinException(unsigned long code)
 {
     switch (code) {
     case EXCEPTION_BREAKPOINT:
@@ -217,7 +217,7 @@ bool winResumeThread(unsigned long, QString *) { return false; }
 bool isWinProcessBeingDebugged(unsigned long) { return false; }
 void formatWindowsException(unsigned long , quint64, unsigned long,
                             quint64, quint64, QTextStream &) { }
-bool isFatalWinException(long) { return false; }
+bool isFatalWinException(unsigned long) { return false; }
 bool isDebuggerWinException(unsigned long) { return false; }
 
 #endif // !Q_OS_WIN
diff --git a/src/plugins/debugger/shared/hostutils.h b/src/plugins/debugger/shared/hostutils.h
index 33485308670..1f35233dc04 100644
--- a/src/plugins/debugger/shared/hostutils.h
+++ b/src/plugins/debugger/shared/hostutils.h
@@ -40,7 +40,7 @@ bool winResumeThread(unsigned long dwThreadId, QString *errorMessage);
 bool isWinProcessBeingDebugged(unsigned long pid);
 
 // Special exception codes.
-enum
+enum : unsigned long
 {
     winExceptionCppException = 0xe06d7363,
     winExceptionSetThreadName = 0x406d1388,
@@ -60,7 +60,7 @@ void formatWindowsException(unsigned long code, quint64 address,
                             unsigned long flags, quint64 info1, quint64 info2,
                             QTextStream &str);
 // Check for access violation, etc.
-bool isFatalWinException(long code);
+bool isFatalWinException(unsigned long code);
 
 // Check for EXCEPTION_BREAKPOINT, EXCEPTION_SINGLE_STEP
 bool isDebuggerWinException(unsigned long code);