Qt: Fix windows version of Preference Dialog

Initializing a static member on Windows C++ has to be done differently.

This fixes the segfault introduced with Ia611ec192dcc1ad638a997182cec1ab5bdb7859c

Change-Id: Ib7a9840feda74830f835345c666f57e23e9e4e0b
Reviewed-on: https://code.wireshark.org/review/25163
Reviewed-by: Roland Knall <rknall@gmail.com>
Petri-Dish: Roland Knall <rknall@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Michael Mann <mmann78@netscape.net>

2 files changed, 11 insertions, 7 deletions

diff --git a/ui/qt/manager/preference_manager.cpp b/ui/qt/manager/preference_manager.cpp
index f979eb6c96..26e64e040c 100644
--- a/ui/qt/manager/preference_manager.cpp
+++ b/ui/qt/manager/preference_manager.cpp
@@ -16,7 +16,11 @@
 
 PreferenceFactory::~PreferenceFactory() {}
 
-QMap<int, PreferenceFactory *> PreferenceManager::factories;
+QMap<int, PreferenceFactory *> & PreferenceManager::factories()
+{
+    static QMap<int, PreferenceFactory *> inst = QMap<int, PreferenceFactory *>();
+    return inst;
+}
 
 PreferenceManager::PreferenceManager(QObject * parent)
     : QObject(parent)
@@ -25,7 +29,7 @@ PreferenceManager::PreferenceManager(QObject * parent)
 PreferenceManager::~PreferenceManager()
 {
     /* As this is a singleton, this is the point, where we can clear the registry */
-    PreferenceManager::factories.clear();
+    PreferenceManager::factories().clear();
 }
 
 PreferenceManager * PreferenceManager::instance()
@@ -41,10 +45,10 @@ void PreferenceManager::registerType(int pref, PreferenceFactory * factory)
 {
     Q_ASSERT(pref >= 0);
 
-    if ( PreferenceManager::factories.contains(pref) || ! factory )
+    if ( PreferenceManager::factories().contains(pref) || ! factory )
         return;
 
-    PreferenceManager::factories[pref] = factory;
+    PreferenceManager::factories()[pref] = factory;
 }
 
 WiresharkPreference * PreferenceManager::getPreference(PrefsItem * pref)
@@ -53,11 +57,11 @@ WiresharkPreference * PreferenceManager::getPreference(PrefsItem * pref)
         return Q_NULLPTR;
 
     int key = pref->getPrefType();
-    if ( ! PreferenceManager::factories.contains(key) )
+    if ( ! PreferenceManager::factories().contains(key) )
         return Q_NULLPTR;
 
     /* All actions are parented with this manager, to clear the objects together with the manager */
-    WiresharkPreference * wspref = qobject_cast<WiresharkPreference *>(PreferenceManager::factories[key]->create(this));
+    WiresharkPreference * wspref = qobject_cast<WiresharkPreference *>(PreferenceManager::factories()[key]->create(this));
     if ( wspref )
         wspref->setPrefsItem(pref);
 
diff --git a/ui/qt/manager/preference_manager.h b/ui/qt/manager/preference_manager.h
index 6ae224ee66..99dc16d0be 100644
--- a/ui/qt/manager/preference_manager.h
+++ b/ui/qt/manager/preference_manager.h
@@ -39,7 +39,7 @@ protected:
     explicit PreferenceManager(QObject * parent = Q_NULLPTR);
 
 private:
-    static QMap<int, PreferenceFactory*> factories;
+    static QMap<int, PreferenceFactory*> & factories();
 };
 
 class PreferenceFactory : public QObject