diff --git a/src/plugins/debugger/gdb/gdbengine.cpp b/src/plugins/debugger/gdb/gdbengine.cpp
index c5aed0d1f0e..3721efc41c7 100644
--- a/src/plugins/debugger/gdb/gdbengine.cpp
+++ b/src/plugins/debugger/gdb/gdbengine.cpp
@@ -3325,14 +3325,14 @@ void GdbEngine::handleRegisterListValues(const GdbResponse &response)
             GdbMi val = item.findChild("value");
             QByteArray ba;
             bool handled = false;
-            if (val.data().startsWith("{")) {
+            if (val.data().startsWith('{')) {
                 int pos1 = val.data().indexOf("v2_int32");
                 if (pos1 == -1)
                     pos1 = val.data().indexOf("v4_int32");
                 if (pos1 != -1) {
                     // FIXME: This block wastes cycles.
-                    pos1 = val.data().indexOf("{", pos1 + 1) + 1;
-                    int pos2 = val.data().indexOf("}", pos1);
+                    pos1 = val.data().indexOf('{', pos1 + 1) + 1;
+                    int pos2 = val.data().indexOf('}', pos1);
                     QByteArray ba2 = val.data().mid(pos1, pos2 - pos1);
                     foreach (QByteArray ba3, ba2.split(',')) {
                         ba3 = ba3.trimmed();
diff --git a/src/plugins/debugger/gdb/trkgdbadapter.cpp b/src/plugins/debugger/gdb/trkgdbadapter.cpp
index ef5590a4ad6..00ffe5b3721 100644
--- a/src/plugins/debugger/gdb/trkgdbadapter.cpp
+++ b/src/plugins/debugger/gdb/trkgdbadapter.cpp
@@ -214,7 +214,7 @@ QByteArray TrkGdbAdapter::trkStepRangeMessage()
     if (from <= pc && pc <= to) {
         //to = qMax(to - 4, from);
         //to = qMax(to - 4, from);
-        showMessage("STEP IN " + hexxNumber(from) + " " + hexxNumber(to)
+        showMessage("STEP IN " + hexxNumber(from) + ' ' + hexxNumber(to)
             + " INSTEAD OF " + hexxNumber(pc));
     } else {
         from = pc;
@@ -502,8 +502,9 @@ void TrkGdbAdapter::handleGdbServerCommand(const QByteArray &cmd)
         sendGdbServerAck();
         bool ok = false;
         const uint signalNumber = cmd.mid(1).toUInt(&ok, 16);
-        logMessage(QString::fromLatin1("Not implemented 'Continue with signal' %1: ").arg(signalNumber), LogWarning);
-        sendGdbServerMessage("O" + QByteArray("Console output").toHex());
+        logMessage(_("Not implemented 'Continue with signal' %1: ")
+            .arg(signalNumber), LogWarning);
+        sendGdbServerMessage('O' + QByteArray("Console output").toHex());
         sendGdbServerMessage("W81"); // "Process exited with result 1
         trkContinueAll("gdb 'C'");
     }
@@ -940,7 +941,7 @@ void TrkGdbAdapter::handleTrkResult(const TrkResult &result)
         // If we do so, TRK will complain about wrong sequencing.
         //sendTrkAck(result.token);
         logMessage(QString::fromAscii(result.data), AppOutput);
-        sendGdbServerMessage("O" + result.data.toHex());
+        sendGdbServerMessage('O' + result.data.toHex());
         return;
     }
     //logMessage("READ TRK " + result.toString());
@@ -1243,13 +1244,13 @@ static QString msgMemoryReadError(int code, uint addr, uint len = 0)
 {
     const QString lenS = len ? QString::number(len) : QLatin1String("<unknown>");
     return _("Memory read error %1 at: 0x%2 %3")
-        .arg(code).arg(addr, 0 ,16).arg(lenS);
+        .arg(code).arg(addr, 0, 16).arg(lenS);
 }
 
 void TrkGdbAdapter::handleReadMemoryBuffered(const TrkResult &result)
 {
     if (extractShort(result.data.data() + 1) + 3 != result.data.size())
-        logMessage("\n BAD MEMORY RESULT: " + result.data.toHex() + "\n", LogError);
+        logMessage("\n BAD MEMORY RESULT: " + result.data.toHex() + '\n', LogError);
     const MemoryRange range = result.cookie.value<MemoryRange>();
     MEMORY_DEBUG("HANDLE READ MEMORY ***BUFFERED*** FOR " << range);
     if (const int errorCode = result.errorCode()) {
@@ -1269,7 +1270,7 @@ void TrkGdbAdapter::handleReadMemoryBuffered(const TrkResult &result)
 void TrkGdbAdapter::handleReadMemoryUnbuffered(const TrkResult &result)
 {
     if (extractShort(result.data.data() + 1) + 3 != result.data.size())
-        logMessage("\n BAD MEMORY RESULT: " + result.data.toHex() + "\n", LogError);
+        logMessage("\n BAD MEMORY RESULT: " + result.data.toHex() + '\n', LogError);
     const MemoryRange range = result.cookie.value<MemoryRange>();
     MEMORY_DEBUG("HANDLE READ MEMORY UNBUFFERED FOR " << range);
     if (const int errorCode = result.errorCode()) {
@@ -1424,7 +1425,7 @@ void TrkGdbAdapter::handleAndReportSetBreakpoint(const TrkResult &result)
     uint bpnr = extractInt(result.data.data() + 1);
     uint addr = result.cookie.toUInt();
     m_session.addressToBP[addr] = bpnr;
-    logMessage("SET BREAKPOINT " + hexxNumber(bpnr) + " "
+    logMessage("SET BREAKPOINT " + hexxNumber(bpnr) + ' '
          + stringFromArray(result.data.data()));
     sendGdbServerMessage("OK");
     //sendGdbServerMessage("OK");
diff --git a/src/plugins/debugger/tcf/json.cpp b/src/plugins/debugger/tcf/json.cpp
index 739d46aee26..f5404f5cde1 100644
--- a/src/plugins/debugger/tcf/json.cpp
+++ b/src/plugins/debugger/tcf/json.cpp
@@ -319,7 +319,7 @@ QByteArray JsonValue::toString(bool multiline, int indent) const
             break;
         case String:
             if (!m_name.isEmpty())
-                result += m_name + "=";
+                result += m_name + '=';
             result += '"' + escapeCString(m_data) + '"';
             break;
         case Number:
@@ -333,24 +333,24 @@ QByteArray JsonValue::toString(bool multiline, int indent) const
             if (multiline) {
                 result += "{\n";
                 dumpChildren(&result, multiline, indent + 1);
-                result += '\n' + ind(indent) + "}";
+                result += '\n' + ind(indent) + '}';
             } else {
-                result += "{";
+                result += '{';
                 dumpChildren(&result, multiline, indent + 1);
-                result += "}";
+                result += '}';
             }
             break;
         case Array:
             if (!m_name.isEmpty())
-                result += m_name + "=";
+                result += m_name + '=';
             if (multiline) {
                 result += "[\n";
                 dumpChildren(&result, multiline, indent + 1);
-                result += '\n' + ind(indent) + "]";
+                result += '\n' + ind(indent) + ']';
             } else {
-                result += "[";
+                result += '[';
                 dumpChildren(&result, multiline, indent + 1);
-                result += "]";
+                result += ']';
             }
             break;
     }
diff --git a/src/plugins/debugger/tcf/tcfengine.cpp b/src/plugins/debugger/tcf/tcfengine.cpp
index f7c8c94a134..97e4f4e4058 100644
--- a/src/plugins/debugger/tcf/tcfengine.cpp
+++ b/src/plugins/debugger/tcf/tcfengine.cpp
@@ -339,7 +339,7 @@ void TcfEngine::handleResponse(const QByteArray &response)
         int token = parts.at(1).toInt();
         TcfCommand tcf = m_cookieForToken[token];
         SDEBUG("COMMAND NOT RECOGNIZED FOR TOKEN" << token << tcf.toString());
-        showMessage(QString::number(token) + "^"
+        showMessage(QString::number(token) + '^'
                + "NOT RECOQNIZED: " + quoteUnprintableLatin1(response),
                 LogOutput);
         acknowledgeResult();
@@ -493,8 +493,8 @@ void TcfEngine::sendCommandNow(const TcfCommand &cmd)
     int result = m_socket->write(cmd.command);
     Q_UNUSED(result)
     m_socket->flush();
-    showMessage(QString::number(cmd.token) + " " + cmd.toString(), LogInput);
-    SDEBUG("SEND " <<  cmd.toString()); //<< " " << QString::number(result));
+    showMessage(QString::number(cmd.token) + ' ' + cmd.toString(), LogInput);
+    SDEBUG("SEND " <<  cmd.toString()); //<< ' ' << QString::number(result));
 }
 
 void TcfEngine::acknowledgeResult()
diff --git a/src/plugins/debugger/watchhandler.cpp b/src/plugins/debugger/watchhandler.cpp
index 3d4f5c29582..9e971e93d17 100644
--- a/src/plugins/debugger/watchhandler.cpp
+++ b/src/plugins/debugger/watchhandler.cpp
@@ -1366,7 +1366,7 @@ void WatchHandler::showEditValue(const WatchData &data)
             p->waitForStarted();
             m_editHandlers[key] = p;
         }
-        p->write(input + "\n");
+        p->write(input + '\n');
     } else {
         QTC_ASSERT(false, qDebug() << "Display format: " << data.editformat);
     }