3 files changed, 21 insertions, 7 deletions
diff --git a/src/corelib/io/qprocess.cpp b/src/corelib/io/qprocess.cpp
index ecad92c33c..20efeae029 100644
--- a/src/corelib/io/qprocess.cpp
+++ b/src/corelib/io/qprocess.cpp
@@ -145,7 +145,7 @@ QT_BEGIN_NAMESPACE
 */
 #ifdef Q_OS_WIN
 static inline QProcessEnvironmentPrivate::Key prepareName(const QString &name)
-{ return name.toUpper(); }
+{ return QProcessEnvironmentPrivate::Key(name); }
 static inline QString nameToString(const QProcessEnvironmentPrivate::Key &name)
 { return name; }
 static inline QProcessEnvironmentPrivate::Value prepareValue(const QString &value)
diff --git a/src/corelib/io/qprocess_p.h b/src/corelib/io/qprocess_p.h
index b2a69ef905..2d4c55670d 100644
--- a/src/corelib/io/qprocess_p.h
+++ b/src/corelib/io/qprocess_p.h
@@ -85,7 +85,15 @@ class QProcessEnvironmentPrivate: public QSharedData
 {
 public:
 #ifdef Q_OS_WIN
-    typedef QString Key;
+    class Key : public QString
+    {
+    public:
+        Key() {}
+        explicit Key(const QString &other) : QString(other) {}
+        Key(const Key &other) : QString(other) {}
+        bool operator==(const Key &other) const { return !compare(other, Qt::CaseInsensitive); }
+    };
+
     typedef QString Value;
 #else
     typedef QByteArray Key;
@@ -100,6 +108,10 @@ public:
     QStringList keys() const;
     void insert(const Hash &hash);
 };
+#ifdef Q_OS_WIN
+Q_DECLARE_TYPEINFO(QProcessEnvironmentPrivate::Key, Q_MOVABLE_TYPE);
+inline uint qHash(const QProcessEnvironmentPrivate::Key &key) { return qHash(key.toCaseFolded()); }
+#endif
 
 class QProcessPrivate : public QIODevicePrivate
 {
diff --git a/src/corelib/io/qprocess_win.cpp b/src/corelib/io/qprocess_win.cpp
index 74d8926546..82043a5c06 100644
--- a/src/corelib/io/qprocess_win.cpp
+++ b/src/corelib/io/qprocess_win.cpp
@@ -285,17 +285,19 @@ static QByteArray qt_create_environment(const QProcessEnvironmentPrivate::Hash &
         QProcessEnvironmentPrivate::Hash copy = environment;
 
         // add PATH if necessary (for DLL loading)
-        if (!copy.contains(QLatin1String("PATH"))) {
+        QProcessEnvironmentPrivate::Key pathKey(QLatin1String("PATH"));
+        if (!copy.contains(pathKey)) {
             QByteArray path = qgetenv("PATH");
             if (!path.isEmpty())
-                copy.insert(QLatin1String("PATH"), QString::fromLocal8Bit(path));
+                copy.insert(pathKey, QString::fromLocal8Bit(path));
         }
 
         // add systemroot if needed
-        if (!copy.contains(QLatin1String("SYSTEMROOT"))) {
-            QByteArray systemRoot = qgetenv("SYSTEMROOT");
+        QProcessEnvironmentPrivate::Key rootKey(QLatin1String("SystemRoot"));
+        if (!copy.contains(rootKey)) {
+            QByteArray systemRoot = qgetenv("SystemRoot");
             if (!systemRoot.isEmpty())
-                copy.insert(QLatin1String("SYSTEMROOT"), QString::fromLocal8Bit(systemRoot));
+                copy.insert(rootKey, QString::fromLocal8Bit(systemRoot));
         }
 
         int pos = 0;