Application object must be constructed before QScriptEngine

This is required due to the switch to the JavaScriptCore-based
back-end.
Instead of segfaulting somewhere inside JSC::initializeThreading(),
call qFatal() when this constraint has been violated.

Reviewed-by: Simon Hausmann

1 files changed, 5 insertions, 1 deletions

diff --git a/src/script/api/qscriptengine.cpp b/src/script/api/qscriptengine.cpp
index d519102..02eb9a3 100644
--- a/src/script/api/qscriptengine.cpp
+++ b/src/script/api/qscriptengine.cpp
@@ -776,7 +776,11 @@ QScriptEnginePrivate::QScriptEnginePrivate()
     qMetaTypeId<QObjectList>();
 #endif
 
-    JSC::initializeThreading(); // ### hmmm
+    if (!QCoreApplication::instance()) {
+        qFatal("QScriptEngine: Must construct a Q(Core)Application before a QScriptEngine");
+        return;
+    }
+    JSC::initializeThreading();
 
     globalData = JSC::JSGlobalData::create().releaseRef();
     globalData->clientData = new QScript::GlobalClientData(this);