2 files changed, 34 insertions, 13 deletions
diff --git a/src/corelib/thread/qmutex.cpp b/src/corelib/thread/qmutex.cpp
index 002a9cc7bc..3269ee3ae8 100644
--- a/src/corelib/thread/qmutex.cpp
+++ b/src/corelib/thread/qmutex.cpp
@@ -563,7 +563,28 @@ const int FreeListConstants::Sizes[FreeListConstants::BlockCount] = {
 };
 
 typedef QFreeList<QMutexPrivate, FreeListConstants> FreeList;
-Q_GLOBAL_STATIC(FreeList, freelist);
+// We cannot use Q_GLOBAL_STATIC because it uses QMutex
+#if defined(Q_COMPILER_THREADSAFE_STATICS)
+FreeList *freelist()
+{
+    static FreeList list;
+    return &list;
+}
+#else
+FreeList *freelist()
+{
+    static QAtomicPointer<FreeList> list;
+    FreeList *local = list.loadAcquire();
+    if (!local) {
+        local = new FreeList;
+        if (!list.testAndSetRelease(0, local)) {
+            delete local;
+            local = list.loadAcquire();
+        }
+    }
+    return local;
+}
+#endif
 }
 
 QMutexPrivate *QMutexPrivate::allocate()
diff --git a/src/corelib/thread/thread.pri b/src/corelib/thread/thread.pri
index 3c1ddd984a..2cb00a6cf4 100644
--- a/src/corelib/thread/thread.pri
+++ b/src/corelib/thread/thread.pri
@@ -46,21 +46,21 @@ SOURCES += thread/qatomic.cpp \
 unix:SOURCES += thread/qthread_unix.cpp \
                          thread/qwaitcondition_unix.cpp
 
-win32:SOURCES += thread/qmutex_win.cpp \
-                 thread/qthread_win.cpp \
+win32:SOURCES += thread/qthread_win.cpp \
 		 thread/qwaitcondition_win.cpp
 
-integrity:SOURCES += thread/qmutex_unix.cpp \
-                thread/qthread_unix.cpp \
+integrity:SOURCES += thread/qthread_unix.cpp \
 		thread/qwaitcondition_unix.cpp
 
-unix: {
-    mac {
-        SOURCES += thread/qmutex_mac.cpp
-    } else:linux-*:!linux-lsb-* {
-        SOURCES += thread/qmutex_linux.cpp
-    } else {
-        SOURCES += thread/qmutex_unix.cpp
-    }
+false {
+    # files #included by others, but listed here so IDEs parsing this file know
+    # they are part of QtCore. Usually, qmake can find out that certain files
+    # are #included by others and thus remove from SOURCES, but it gets lost
+    # with qmutex.cpp.
+    SOURCES += \
+        thread/qmutex_linux.cpp \
+        thread/qmutex_mac.cpp \
+        thread/qmutex_unix.cpp \
+        thread/qmutex_win.cpp
 }