diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -45,9 +45,6 @@
 find_package(KF5WidgetsAddons ${KF5_DEP_VERSION} REQUIRED)
 find_package(KF5ItemViews ${KF5_DEP_VERSION} REQUIRED)
 
-remove_definitions(-DQT_NO_CAST_FROM_ASCII)
-remove_definitions(-DQT_NO_CAST_FROM_BYTEARRAY)
-
 add_definitions(-DTRANSLATION_DOMAIN=\"kiconthemes5\")
 if (IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/po")
     ki18n_install(po)
diff --git a/autotests/kiconengine_unittest.cpp b/autotests/kiconengine_unittest.cpp
--- a/autotests/kiconengine_unittest.cpp
+++ b/autotests/kiconengine_unittest.cpp
@@ -37,7 +37,7 @@
         QStandardPaths::setTestModeEnabled(true);
 
         // Remove icon cache
-        const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + "/icon-cache.kcache";
+        const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QStringLiteral("/icon-cache.kcache");
         QFile::remove(cacheFile);
 
         KConfigGroup cg(KSharedConfig::openConfig(), "Icons");
diff --git a/autotests/kiconloader_benchmark.cpp b/autotests/kiconloader_benchmark.cpp
--- a/autotests/kiconloader_benchmark.cpp
+++ b/autotests/kiconloader_benchmark.cpp
@@ -104,7 +104,7 @@
     {
         QBENCHMARK {
             // Remove icon cache
-            const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + "/icon-cache.kcache";
+            const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QStringLiteral("/icon-cache.kcache");
             QFile::remove(cacheFile);
             // Clear SHM cache
             KIconLoader::global()->reconfigure(QString());
diff --git a/autotests/kiconloader_rcctest.cpp b/autotests/kiconloader_rcctest.cpp
--- a/autotests/kiconloader_rcctest.cpp
+++ b/autotests/kiconloader_rcctest.cpp
@@ -35,12 +35,12 @@
 {
     QStandardPaths::enableTestMode(true);
     qputenv("XDG_DATA_DIRS", "/doesnotexist"); // ensure hicolor/oxygen/breeze are not found
-    QFile rcc("icontheme.rcc");
+    QFile rcc(QStringLiteral("icontheme.rcc"));
     Q_ASSERT(rcc.exists());
-    QCoreApplication::setApplicationName("myappname"); // for a fixed location on Unix (appname is empty here otherwise)
+    QCoreApplication::setApplicationName(QStringLiteral("myappname")); // for a fixed location on Unix (appname is empty here otherwise)
     const QString destDir = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
     QDir().mkpath(destDir);
-    const QString dest = destDir + "/icontheme.rcc";
+    const QString dest = destDir + QStringLiteral("/icontheme.rcc");
     QFile::remove(dest);
     if (!rcc.copy(dest)) {
         qWarning() << "Error copying to" << dest;
@@ -56,7 +56,7 @@
     void initTestCase()
     {
         // Remove icon cache
-        const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + "/icon-cache.kcache";
+        const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QStringLiteral("/icon-cache.kcache");
         QFile::remove(cacheFile);
 
         // Clear SHM cache
@@ -89,7 +89,7 @@
 
     }
 private:
-    const QString m_internalThemeName = "kf5_rcc_theme";
+    const QString m_internalThemeName = QStringLiteral("kf5_rcc_theme");
 };
 
 QTEST_MAIN(KIconLoader_RCCThemeTest)
diff --git a/autotests/kiconloader_resourcethemetest.cpp b/autotests/kiconloader_resourcethemetest.cpp
--- a/autotests/kiconloader_resourcethemetest.cpp
+++ b/autotests/kiconloader_resourcethemetest.cpp
@@ -48,7 +48,7 @@
         KIconLoader::global()->loadIcon(QStringLiteral("someiconintheme"), KIconLoader::Desktop, 22,
                                     KIconLoader::DefaultState, QStringList(),
                                     &path);
-        QCOMPARE(path, QString(":/icons/themeinresource/22x22/appsNoContext/someiconintheme.png"));
+        QCOMPARE(path, QStringLiteral(":/icons/themeinresource/22x22/appsNoContext/someiconintheme.png"));
 
     }
 };
diff --git a/autotests/kiconloader_unittest.cpp b/autotests/kiconloader_unittest.cpp
--- a/autotests/kiconloader_unittest.cpp
+++ b/autotests/kiconloader_unittest.cpp
@@ -132,7 +132,7 @@
 
             QPixmap img(i, i);
             img.fill(Qt::red);
-            QVERIFY(img.save(dir + "/red.png"));
+            QVERIFY(img.save(dir + QStringLiteral("/red.png")));
 
             dirs += relDir;
             KConfigGroup dirGroup = configFile.group(relDir);
@@ -157,7 +157,7 @@
     void init()
     {
         // Remove icon cache
-        const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + "/icon-cache.kcache";
+        const QString cacheFile = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QStringLiteral("/icon-cache.kcache");
         QFile::remove(cacheFile);
 
         // Clear SHM cache
@@ -242,15 +242,15 @@
     {
         KIconLoader appIconLoader(appName);
         QString iconPath = appIconLoader.iconPath(QStringLiteral("image1"), KIconLoader::User);
-        QCOMPARE(iconPath, appDataDir.filePath("pics/image1.png"));
+        QCOMPARE(iconPath, appDataDir.filePath(QStringLiteral("pics/image1.png")));
         QVERIFY(QFile::exists(iconPath));
 
         // Load it again, to use the "last loaded" cache
         QString iconPath2 = appIconLoader.iconPath(QStringLiteral("image1"), KIconLoader::User);
         QCOMPARE(iconPath, iconPath2);
         // Load something else, to clear the "last loaded" cache
         QString iconPathTextEdit = appIconLoader.iconPath(QStringLiteral("image2"), KIconLoader::User);
-        QCOMPARE(iconPathTextEdit, appDataDir.filePath("pics/image2.png"));
+        QCOMPARE(iconPathTextEdit, appDataDir.filePath(QStringLiteral("pics/image2.png")));
         QVERIFY(QFile::exists(iconPathTextEdit));
         // Now load kdialog again, to use the real kiconcache
         iconPath2 = appIconLoader.iconPath(QStringLiteral("image1"), KIconLoader::User);
@@ -309,7 +309,7 @@
                       KIconLoader::DefaultState, QStringList(),
                       &path);
         QVERIFY(!pix.isNull());
-        QCOMPARE(path.section('/', -1), expectedFileName);
+        QCOMPARE(path.section(QLatin1Char('/'), -1), expectedFileName);
 
         // do the same test using a global iconloader, so that
         // we get into the final return statement, which can only happen
@@ -325,15 +325,15 @@
     void testHasIcon()
     {
         // Do everything twice to check code paths that might use a cache
-        QVERIFY(KIconLoader::global()->hasIcon("kde"));
-        QVERIFY(KIconLoader::global()->hasIcon("kde"));
+        QVERIFY(KIconLoader::global()->hasIcon(QStringLiteral("kde")));
+        QVERIFY(KIconLoader::global()->hasIcon(QStringLiteral("kde")));
         KIconLoader iconLoader;
-        QVERIFY(iconLoader.hasIcon("kde"));
+        QVERIFY(iconLoader.hasIcon(QStringLiteral("kde")));
 
-        QVERIFY(KIconLoader::global()->hasIcon("process-working"));
-        QVERIFY(KIconLoader::global()->hasIcon("process-working"));
-        QVERIFY(!KIconLoader::global()->hasIcon("no-such-icon-exists"));
-        QVERIFY(!KIconLoader::global()->hasIcon("no-such-icon-exists"));
+        QVERIFY(KIconLoader::global()->hasIcon(QStringLiteral("process-working")));
+        QVERIFY(KIconLoader::global()->hasIcon(QStringLiteral("process-working")));
+        QVERIFY(!KIconLoader::global()->hasIcon(QStringLiteral("no-such-icon-exists")));
+        QVERIFY(!KIconLoader::global()->hasIcon(QStringLiteral("no-such-icon-exists")));
     }
 
     void testIconPath()
@@ -355,7 +355,7 @@
                                         &path);
         QVERIFY(!path.isEmpty());
         QVERIFY(QFile::exists(path));
-        QVERIFY2(path.contains("32x32"), qPrintable(path));
+        QVERIFY2(path.contains(QStringLiteral("32x32")), qPrintable(path));
         QCOMPARE(pix.size(), QSize(32, 32));
 
         // Compare with iconPath()
@@ -368,10 +368,10 @@
                                         &path);
         QVERIFY(!path.isEmpty());
         QVERIFY(QFile::exists(path));
-        QVERIFY2(path.contains("22x22"), qPrintable(path));
+        QVERIFY2(path.contains(QStringLiteral("22x22")), qPrintable(path));
         QCOMPARE(pix.size(), QSize(24, 24));
 
-        QVERIFY(KIconLoader::global()->hasIcon("kde"));
+        QVERIFY(KIconLoader::global()->hasIcon(QStringLiteral("kde")));
 
         path = QString();
         KIconLoader::global()->loadIcon(QStringLiteral("does_not_exist"), KIconLoader::Desktop, 24,
@@ -437,21 +437,21 @@
             KIconLoader::global()->loadIcon(QStringLiteral("iconindirectorywithoutcontext"), KIconLoader::Desktop, 24,
                                         KIconLoader::DefaultState, QStringList(),
                                         &path);
-            QVERIFY(path.endsWith("appsNoContext/iconindirectorywithoutcontext.png"));
+            QVERIFY(path.endsWith(QLatin1String("appsNoContext/iconindirectorywithoutcontext.png")));
         }
         {
             QString path;
             KIconLoader::global()->loadIcon(QStringLiteral("iconindirectorywithouttype"), KIconLoader::Desktop, 24,
                                         KIconLoader::DefaultState, QStringList(),
                                         &path);
-            QVERIFY(path.endsWith("appsNoType/iconindirectorywithouttype.png"));
+            QVERIFY(path.endsWith(QLatin1String("appsNoType/iconindirectorywithouttype.png")));
         }
         {
             QString path;
             KIconLoader::global()->loadIcon(QStringLiteral("iconindirectorywithoutcontextortype"), KIconLoader::Desktop, 24,
                                         KIconLoader::DefaultState, QStringList(),
                                         &path);
-            QVERIFY(path.endsWith("appsNoContextOrType/iconindirectorywithoutcontextortype.png"));
+            QVERIFY(path.endsWith(QLatin1String("appsNoContextOrType/iconindirectorywithoutcontextortype.png")));
         }
     }
 
@@ -514,14 +514,14 @@
 
         // Verify the ARGB hex (ff6496c8)
         uintToHex(testColorNoAlpha.rgba(), argbHex.data());
-        QCOMPARE(argbHex, QString("ff6496c8"));
+        QCOMPARE(argbHex, QStringLiteral("ff6496c8"));
 
         // HEX (ARGB format without the #): 7b6496c8
         QColor testColorWithAlpha(100, 150, 200, 123);
 
         // Test uintToHex to verify its ARGB output.
         uintToHex(testColorWithAlpha.rgba(), argbHex.data());
-        QCOMPARE(argbHex, QString("7b6496c8"));
+        QCOMPARE(argbHex, QStringLiteral("7b6496c8"));
     }
 };
 
diff --git a/src/kicondialog.cpp b/src/kicondialog.cpp
--- a/src/kicondialog.cpp
+++ b/src/kicondialog.cpp
@@ -415,9 +415,9 @@
 
 static bool sortByFileName(const QString &path1, const QString &path2)
 {
-    const QString fileName1 = path1.mid(path1.lastIndexOf('/') + 1);
-    const QString fileName2 = path2.mid(path1.lastIndexOf('/') + 1);
-    return QString::compare(fileName1, fileName2, Qt::CaseInsensitive) < 0;
+    const auto fileName1 = path1.midRef(path1.lastIndexOf(QLatin1Char('/')) + 1);
+    const auto fileName2 = path2.midRef(path1.lastIndexOf(QLatin1Char('/')) + 1);
+    return fileName1.compare(fileName2, Qt::CaseInsensitive) < 0;
 }
 
 void KIconDialog::KIconDialogPrivate::showIcons()
@@ -437,8 +437,8 @@
         Q_FOREACH (const QString &relDir, KIconLoader::global()->searchPaths()) {
             const QStringList dirs = QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, relDir, QStandardPaths::LocateDirectory);
             Q_FOREACH (const QString &dir, dirs) {
-                Q_FOREACH (const QString &fileName, QDir(dir).entryList(QStringList() << "*.png")) {
-                    filelist << dir + '/' + fileName;
+                Q_FOREACH (const QString &fileName, QDir(dir).entryList(QStringList() << QStringLiteral("*.png"))) {
+                    filelist << dir + QLatin1Char('/') + fileName;
                 }
             }
         }
diff --git a/src/kiconeffect.cpp b/src/kiconeffect.cpp
--- a/src/kiconeffect.cpp
+++ b/src/kiconeffect.cpp
@@ -106,9 +106,9 @@
         d->color2[i][1] = QColor(0, 0, 0);
         d->color2[i][2] = QColor(0, 0, 0);
 
-        KConfigGroup cg(config, *it + "Icons");
+        KConfigGroup cg(config, *it + QStringLiteral("Icons"));
         for (it2 = states.constBegin(), j = 0; it2 != states.constEnd(); ++it2, ++j) {
-            QString tmp = cg.readEntry(*it2 + "Effect", QString());
+            QString tmp = cg.readEntry(*it2 + QStringLiteral("Effect"), QString());
             if (tmp == _togray) {
                 effect = ToGray;
             } else if (tmp == _colorize) {
@@ -127,10 +127,10 @@
             if (effect != -1) {
                 d->effect[i][j] = effect;
             }
-            d->value[i][j] = cg.readEntry(*it2 + "Value", 0.0);
-            d->color[i][j] = cg.readEntry(*it2 + "Color", QColor());
-            d->color2[i][j] = cg.readEntry(*it2 + "Color2", QColor());
-            d->trans[i][j] = cg.readEntry(*it2 + "SemiTransparent", false);
+            d->value[i][j] = cg.readEntry(*it2 + QStringLiteral("Value"), 0.0);
+            d->color[i][j] = cg.readEntry(*it2 + QStringLiteral("Color"), QColor());
+            d->color2[i][j] = cg.readEntry(*it2 + QStringLiteral("Color2"), QColor());
+            d->trans[i][j] = cg.readEntry(*it2 + QStringLiteral("SemiTransparent"), false);
 
         }
     }
@@ -155,20 +155,15 @@
 
     QString cached = d->key[group][state];
     if (cached.isEmpty()) {
-        QString tmp;
-        cached = tmp.setNum(d->effect[group][state]);
-        cached += ':';
-        cached += tmp.setNum(d->value[group][state]);
-        cached += ':';
-        cached += d->trans[group][state] ? QLatin1String("trans")
-                  : QLatin1String("notrans");
-        if (d->effect[group][state] == Colorize || d->effect[group][state] == ToMonochrome) {
-            cached += ':';
-            cached += d->color[group][state].name();
-        }
-        if (d->effect[group][state] == ToMonochrome) {
-            cached += ':';
-            cached += d->color2[group][state].name();
+        const auto effectGroupState = d->effect[group][state];
+        cached = QString::number(effectGroupState) + QLatin1Char(':')
+               + QString::number(d->value[group][state]) + QLatin1Char(':')
+               + (d->trans[group][state] ? QLatin1String("trans") : QLatin1String("notrans"));
+
+        if (state == Colorize || effectGroupState == ToMonochrome) {
+            cached += QLatin1Char(':') + d->color[group][state].name();
+        } else if (effectGroupState == ToMonochrome) {
+            cached += QLatin1Char(':') + d->color2[group][state].name();
         }
 
         d->key[group][state] = cached;
diff --git a/src/kiconloader.cpp b/src/kiconloader.cpp
--- a/src/kiconloader.cpp
+++ b/src/kiconloader.cpp
@@ -101,7 +101,7 @@
 static bool pathIsRelative(const QString &path)
 {
 #ifdef Q_OS_UNIX
-    return (!path.isEmpty() && path[0] != QChar('/'));
+    return (!path.isEmpty() && path[0] != QLatin1Char('/'));
 #else
     return QDir::isRelativePath(path);
 #endif
@@ -128,8 +128,8 @@
     uchar *colorFields = reinterpret_cast<uchar*>(&colorData);
 
     for (int i = 0; i < 4; i++) {
-        *buffer-- = hexLookup[*colorFields & 0xf];
-        *buffer-- = hexLookup[*colorFields >> 4];
+        *buffer-- = QLatin1Char(hexLookup[*colorFields & 0xf]);
+        *buffer-- = QLatin1Char(hexLookup[*colorFields >> 4]);
         colorFields++;
     }
 }
@@ -448,10 +448,10 @@
         stream.setCodec("ISO 8859-1");
         while (!stream.atEnd()) {
             const QString line = stream.readLine();
-            if (line.isEmpty() || line[0] == '#') {
+            if (line.isEmpty() || line[0] == QLatin1Char('#')) {
                 continue;
             }
-            const int pos = line.indexOf(':');
+            const int pos = line.indexOf(QLatin1Char(':'));
             if (pos == -1) { // syntax error
                 continue;
             }
@@ -612,7 +612,7 @@
             break;
         }
 
-        KConfigGroup cg(config, QLatin1String(groups[i]) + "Icons");
+        KConfigGroup cg(config, QLatin1String(groups[i]) + QStringLiteral("Icons"));
         mpGroups[i].size = cg.readEntry("Size", 0);
 
         if (!mpGroups[i].size && defaultSizesTheme) {
@@ -649,7 +649,7 @@
     addBaseThemes(mpThemeRoot, appname);
 
     // Insert application specific themes at the top.
-    searchPaths.append(appname + "/pics");
+    searchPaths.append(appname + QStringLiteral("/pics"));
 
     // Add legacy icon dirs.
     searchPaths.append(QStringLiteral("icons")); // was xdgdata-icon in KStandardDirs
@@ -673,7 +673,7 @@
 {
     d->initIconThemes();
 
-    d->searchPaths.append(appname + "/pics");
+    d->searchPaths.append(appname + QStringLiteral("/pics"));
     d->addAppThemes(appname, themeBaseDir);
 }
 
@@ -769,16 +769,16 @@
         const QStringList lst = dir.entryList(QStringList(QStringLiteral("default.*")), QDir::Dirs);
         QStringList::ConstIterator it2;
         for (it2 = lst.begin(); it2 != lst.end(); ++it2) {
-            if (!QFileInfo::exists(*it + *it2 + "/index.desktop")
-                    && !QFileInfo::exists(*it + *it2 + "/index.theme")) {
+            if (!QFileInfo::exists(*it + *it2 + QStringLiteral("/index.desktop"))
+                    && !QFileInfo::exists(*it + *it2 + QStringLiteral("/index.theme"))) {
                 continue;
             }
             //TODO: Is any special handling required for NTFS symlinks?
 #ifndef Q_OS_WIN
-            const int r = readlink(QFile::encodeName(*it + *it2), buf, sizeof(buf) - 1);
+            const int r = readlink(QFile::encodeName(*it + *it2).constData(), buf, sizeof(buf) - 1);
             if (r > 0) {
                 buf[r] = 0;
-                const QDir dir2(buf);
+                const QDir dir2(QFile::decodeName(buf));
                 QString themeName = dir2.dirName();
 
                 if (!list.contains(themeName)) {
@@ -1087,7 +1087,7 @@
                 break;
             }
 
-            int rindex = currentName.lastIndexOf('-');
+            int rindex = currentName.lastIndexOf(QLatin1Char('-'));
             if (rindex > 1) { // > 1 so that we don't split x-content or x-epoc
                 currentName.truncate(rindex);
 
@@ -1139,7 +1139,7 @@
 QString KIconLoaderPrivate::locate(const QString &fileName)
 {
     Q_FOREACH (const QString &dir, searchPaths) {
-        const QString path = dir + '/' + fileName;
+        const QString path = dir + QLatin1Char('/') + fileName;
         if (QDir(dir).isAbsolute()) {
             if (QFileInfo::exists(path)) {
                 return path;
@@ -1267,7 +1267,7 @@
     // Special case for absolute path icons.
     if (name.startsWith(QLatin1String("favicons/"))) {
         favIconOverlay = true;
-        name = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + '/' + name + ".png";
+        name = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QLatin1Char('/') + name + QStringLiteral(".png");
     }
 
     bool absolutePath = !pathIsRelative(name);
@@ -1393,9 +1393,9 @@
     if (file.isEmpty()) {
         return nullptr;
     }
-    int dirLen = file.lastIndexOf('/');
+    int dirLen = file.lastIndexOf(QLatin1Char('/'));
     QString icon = iconPath(name, size ? -size : group, true);
-    if (!icon.isEmpty() && file.left(dirLen) != icon.left(dirLen)) {
+    if (!icon.isEmpty() && file.leftRef(dirLen) != icon.leftRef(dirLen)) {
         return nullptr;
     }
     QMovie *movie = new QMovie(file, QByteArray(), parent);
@@ -1423,7 +1423,7 @@
         group = KIconLoader::Desktop;
     }
 
-    QString file = name + ".mng";
+    QString file = name + QStringLiteral(".mng");
     if (group == KIconLoader::User) {
         file = d->locate(file);
     } else {
@@ -1473,9 +1473,9 @@
         group = KIconLoader::Desktop;
     }
 
-    QString file = name + "/0001";
+    QString file = name + QStringLiteral("/0001");
     if (group == KIconLoader::User) {
-        file = d->locate(file + ".png");
+        file = d->locate(file + QStringLiteral(".png"));
     } else {
         if (size == 0) {
             size = d->mpGroups[group].size;
@@ -1487,7 +1487,7 @@
     }
 
     QString path = file.left(file.length() - 8);
-    QDir dir(QFile::encodeName(path));
+    QDir dir(path);
     if (!dir.exists()) {
         return lst;
     }
@@ -1533,7 +1533,7 @@
     QStringList result;
     QStringList::ConstIterator it;
     for (it = lst.begin(); it != lst.end(); ++it) {
-        result += iconsDir + '/' + *it;
+        result += iconsDir + QLatin1Char('/') + *it;
     }
     return result;
 }
@@ -1564,7 +1564,7 @@
     QStringList res2, entries;
     QStringList::ConstIterator it;
     for (it = result.constBegin(); it != result.constEnd(); ++it) {
-        int n = (*it).lastIndexOf('/');
+        int n = (*it).lastIndexOf(QLatin1Char('/'));
         if (n == -1) {
             name = *it;
         } else {
@@ -1605,7 +1605,7 @@
     QStringList res2, entries;
     QStringList::ConstIterator it;
     for (it = result.constBegin(); it != result.constEnd(); ++it) {
-        int n = (*it).lastIndexOf('/');
+        int n = (*it).lastIndexOf(QLatin1Char('/'));
         if (n == -1) {
             name = *it;
         } else {
diff --git a/src/kicontheme.cpp b/src/kicontheme.cpp
--- a/src/kicontheme.cpp
+++ b/src/kicontheme.cpp
@@ -106,7 +106,7 @@
     QStringList iconList() const;
     QString constructFileName(const QString &file) const
     {
-        return mBaseDir + mThemeDir + '/' + file;
+        return mBaseDir + mThemeDir + QLatin1Char('/') + file;
     }
 
     KIconLoader::Context context() const
@@ -163,15 +163,15 @@
             (name == defaultThemeName() || name == QLatin1String("hicolor") || name == QLatin1String("locolor"))) {
         const QStringList icnlibs = QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation);
         for (QStringList::ConstIterator it = icnlibs.constBegin(); it != icnlibs.constEnd(); ++it) {
-            const QString cDir = *it + '/' + appName + "/icons/" + name + '/';
+            const QString cDir = *it + QLatin1Char('/') + appName + QStringLiteral("/icons/") + name + QLatin1Char('/');
             if (QFileInfo::exists(cDir)) {
                 themeDirs += cDir;
             }
         }
 
         if (!basePathHint.isEmpty()) {
             // Checks for dir existing are done below
-            themeDirs += basePathHint + '/' + name + '/';
+            themeDirs += basePathHint + QLatin1Char('/') + name + QLatin1Char('/');
         }
     }
 
@@ -189,17 +189,17 @@
 
     QString fileName, mainSection;
     for (QStringList::ConstIterator it = icnlibs.constBegin(); it != icnlibs.constEnd(); ++it) {
-        const QString cDir = *it + '/' + name + '/';
+        const QString cDir = *it + QLatin1Char('/') + name + QLatin1Char('/');
         if (QDir(cDir).exists()) {
             themeDirs += cDir;
             if (d->mDir.isEmpty()) {
-                if (QFileInfo::exists(cDir + "index.theme")) {
+                if (QFileInfo::exists(cDir + QStringLiteral("index.theme"))) {
                     d->mDir = cDir;
-                    fileName = d->mDir + "index.theme";
+                    fileName = d->mDir + QStringLiteral("index.theme");
                     mainSection = QStringLiteral("Icon Theme");
-                } else if (QFileInfo::exists(cDir + "index.desktop")) {
+                } else if (QFileInfo::exists(cDir + QStringLiteral("index.desktop"))) {
                     d->mDir = cDir;
-                    fileName = d->mDir + "index.desktop";
+                    fileName = d->mDir + QStringLiteral("index.desktop");
                     mainSection = QStringLiteral("KDE Icon Theme");
                 }
             }
@@ -232,13 +232,13 @@
     d->followsColorScheme = cfg.readEntry("FollowsColorScheme", false);
     d->example = cfg.readPathEntry("Example", QString());
     d->screenshot = cfg.readPathEntry("ScreenShot", QString());
-    d->mExtensions = cfg.readEntry("KDE-Extensions", QStringList{ ".png", ".svgz", ".svg", ".xpm" });
+    d->mExtensions = cfg.readEntry("KDE-Extensions", QStringList{ QStringLiteral(".png"), QStringLiteral(".svgz"), QStringLiteral(".svg"), QStringLiteral(".xpm") });
 
     const QStringList dirs = cfg.readPathEntry("Directories", QStringList());
     for (QStringList::ConstIterator it = dirs.begin(); it != dirs.end(); ++it) {
         KConfigGroup cg(d->sharedConfig, *it);
         for (QStringList::ConstIterator itDir = themeDirs.constBegin(); itDir != themeDirs.constEnd(); ++itDir) {
-            const QString currentDir(*itDir + *it + '/');
+            const QString currentDir(*itDir + *it + QLatin1Char('/'));
             if (!addedDirs.contains(currentDir) && QDir(currentDir).exists()) {
                 addedDirs.insert(currentDir);
                 KIconThemeDir *dir = new KIconThemeDir(*itDir, *it, cg);
@@ -262,8 +262,8 @@
     KConfigGroup cg(d->sharedConfig, mainSection);
     for (int i = 0; i < groups.size(); ++i) {
         const QString group = groups.at(i);
-        d->mDefSize[i] = cg.readEntry(group + "Default", defDefSizes[i]);
-        d->mSizes[i] = cg.readEntry(group + "Sizes", QList<int>());
+        d->mDefSize[i] = cg.readEntry(group + QStringLiteral("Default"), defDefSizes[i]);
+        d->mSizes[i] = cg.readEntry(group + QStringLiteral("Sizes"), QList<int>());
     }
 }
 
diff --git a/src/tools/kiconfinder/kiconfinder.cpp b/src/tools/kiconfinder/kiconfinder.cpp
--- a/src/tools/kiconfinder/kiconfinder.cpp
+++ b/src/tools/kiconfinder/kiconfinder.cpp
@@ -29,7 +29,7 @@
 {
     QGuiApplication app(argc, argv);
     app.setApplicationName(QStringLiteral("kiconfinder"));
-    app.setApplicationVersion(KICONTHEMES_VERSION_STRING);
+    app.setApplicationVersion(QStringLiteral(KICONTHEMES_VERSION_STRING));
     QCommandLineParser parser;
     parser.setApplicationDescription(app.translate("main", "Finds an icon based on its name"));
     parser.addPositionalArgument(QStringLiteral("iconname"), app.translate("main", "The icon name to look for"));