WaE: gcc 4.6.0 various warnings

idlc/source/aststack.cxx

@@ -124,11 +124,9 @@ AstStack* AstStack::push(AstScope* pScope)
 
 void AstStack::pop()
 {
-    AstScope *pScope;
-
     if (m_top < 1)
         return;
-    pScope = m_stack[--m_top];
+    --m_top;
 }
 
 void AstStack::clear()

idlc/source/astunion.cxx

@@ -305,7 +305,6 @@ sal_Bool AstUnion::dump(RegistryKey& rKey)
         AstUnionLabel*  pLabel = NULL;
         AstExprValue*   pExprValue = NULL;
         RTConstValue    aConst;
-        RTFieldAccess   access = RT_ACCESS_READWRITE;
         OUString    docu;
         sal_uInt16  index = 0;
         if ( pDefault )
@@ -345,7 +344,6 @@ sal_Bool AstUnion::dump(RegistryKey& rKey)
 
         if ( pDefault )
         {
-            access = RT_ACCESS_DEFAULT;
             aConst.m_type = RT_TYPE_INT64;
             aConst.m_value.aHyper = disc + 1;
             aBlob.setFieldData(