diff --git a/main.cpp b/main.cpp
index 2404ee96c0..d115ee09c7 100644
--- a/main.cpp
+++ b/main.cpp
@@ -159,7 +159,7 @@ int executeLLVMCode(void *codePtr)
     void (*code)(VM::ExecutionContext *) = (void (*)(VM::ExecutionContext *)) codePtr;
 
     QScopedPointer<QQmlJS::EvalISelFactory> iSelFactory(new QQmlJS::Moth::ISelFactory);
-    VM::ExecutionEngine vm(0, iSelFactory.data());
+    VM::ExecutionEngine vm(iSelFactory.data());
     VM::ExecutionContext *ctx = vm.rootContext;
 
     QQmlJS::VM::Object *globalObject = vm.globalObject.objectValue();
diff --git a/qmljs_value.h b/qmljs_value.h
index b8c78d3f1f..48ec2d4541 100644
--- a/qmljs_value.h
+++ b/qmljs_value.h
@@ -125,8 +125,8 @@ struct Value
 
     };
 
-    inline ValueType type() const {
-        return (ValueType)(tag & Type_Mask);
+    inline unsigned type() const {
+        return tag & Type_Mask;
     }
 
     inline bool isUndefined() const { return tag == _Undefined_Type; }
diff --git a/qv4mm.cpp b/qv4mm.cpp
index fe652b4028..9339b38244 100644
--- a/qv4mm.cpp
+++ b/qv4mm.cpp
@@ -165,7 +165,7 @@ Managed *MemoryManager::alloc(std::size_t size)
 void MemoryManager::scribble(Managed *obj, int c, int size) const
 {
     if (m_d->scribble)
-        ::memset(obj + 1, c, size - sizeof(Managed));
+        ::memset((void *)(obj + 1), c, size - sizeof(Managed));
 }
 
 std::size_t MemoryManager::mark(const QVector<Object *> &objects)
diff --git a/v4.pro b/v4.pro
index 80687b4ca5..e947da90bb 100644
--- a/v4.pro
+++ b/v4.pro
@@ -64,6 +64,8 @@ INCLUDEPATH += \
     $$system($$LLVM_CONFIG --includedir)
 
 QMAKE_CXXFLAGS += $$system($$LLVM_CONFIG --cppflags) -fvisibility-inlines-hidden
+QMAKE_CXXFLAGS -= -pedantic
+QMAKE_CXXFLAGS -= -Wcovered-switch-default
 
 LIBS += \
     $$system($$LLVM_CONFIG --ldflags) \
@@ -72,6 +74,7 @@ LIBS += \
 QMAKE_EXTRA_TARGETS += gen_llvm_runtime
 
 GEN_LLVM_RUNTIME_FLAGS = $$system($$LLVM_CONFIG --cppflags)
+GEN_LLVM_RUNTIME_FLAGS -= -pedantic
 
 gen_llvm_runtime.target = llvm_runtime
 gen_llvm_runtime.commands = clang -O2 -emit-llvm -c $(INCPATH) $$GEN_LLVM_RUNTIME_FLAGS -DQMLJS_LLVM_RUNTIME llvm_runtime.cpp -o llvm_runtime.bc