(Case 680326) IL2CPP xcode compile error

Found a possible IL2CPP compile error. I think it's related to use of System.Xml. Compiles and runs fine using Mono (2.x) on an iPhone 6.

 

Testing on 5.0.0p1. It compiles now. However, it causes an exception at runtime on iPhone 6 / Xcode 6.2.

Code (CSharp):

1. NotSupportedException: Failed to construct generic type 'System.Reflection.MonoProperty+Getter`2' with generic arguments [Formations, System.Collections.Generic.List`1[[Formation, Assembly-CSharp, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]] at runtime.
2.   at System.Type.MakeGenericType (System.Type gt, System.Type[] types) [0x00000] in <filename unknown>:0
3.   at System.Type.MakeGenericType (System.Type[] typeArguments) [0x00000] in <filename unknown>:0
4.   at UnityEngine.Events.UnityAction.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
5.   at System.Reflection.MonoProperty.CreateGetterDelegate (System.Reflection.MethodInfo method) [0x00000] in <filename unknown>:0
6.   at System.Reflection.MonoProperty.GetValue (System.Object obj, System.Object[] index) [0x00000] in <filename unknown>:0
7.   at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
8.   at System.Xml.Serialization.XmlTypeMapMember.GetValue (System.Object ob) [0x00000] in <filename unknown>:0
9.   at System.Xml.Serialization.XmlSerializationReaderInterpreter.ReadMembers (System.Xml.Serialization.ClassMap map, System.Object ob, Boolean isValueList, Boolean readByOrder) [0x00000] in <filename unknown>:0
10.   at System.Xml.Serialization.XmlSerializationReaderInterpreter.ReadClassInstanceMembers (System.Xml.Serialization.XmlTypeMapping typeMap, System.Object ob) [0x00000] in <filename unknown>:0
11.   at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
12.   at System.Xml.Serialization.XmlSerializationReaderInterpreter.ReadClassInstance (System.Xml.Serialization.XmlTypeMapping typeMap, Boolean isNullable, Boolean checkType) [0x00000] in <filename unknown>:0
13.   at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
14.   at System.Xml.Serialization.XmlSerializationReaderInterpreter.ReadObject (System.Xml.Serialization.XmlTypeMapping typeMap, Boolean isNullable, Boolean checkType) [0x00000] in <filename unknown>:0
15.   at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
16.   at System.Xml.Serialization.XmlSerializationReaderInterpreter.ReadRoot (System.Xml.Serialization.XmlTypeMapping rootMap) [0x00000] in <filename unknown>:0
17.   at System.Xml.Serialization.XmlSerializationReaderInterpreter.ReadRoot () [0x00000] in <filename unknown>:0
18.   at System.Xml.Serialization.XmlSerializer.Deserialize (System.Xml.Serialization.XmlSerializationReader reader) [0x00000] in <filename unknown>:0
19.   at System.Xml.Serialization.XmlNodeEventHandler.EndInvoke (IAsyncResult result) [0x00000] in <filename unknown>:0
20.   at System.Xml.Serialization.XmlSerializer.Deserialize (System.Xml.XmlReader xmlReader) [0x00000] in <filename unknown>:0
21.   at FormationLoader.readFormationXML () [0x00000] in <filename unknown>:0
22.   at testLoad.Start () [0x00000] in <filename unknown>:0
23.   at Replacements.RemotingServices.CreateClientProxy (System.Type objectType, System.String url, System.Object[] activationAttributes) [0x00000] in <filename unknown>:0
24. Replacements.RemotingServices:CreateClientProxy(Type, String, Object[])
25. (Filename: currently not available on il2cpp Line: -1)

 

I had been beating my head against this since Unity 5 was released. An XML definition in my project had a List<T> member in it that was causing deserialization to fail. Instead of waiting for a fix, I opted to, instead, change all List<T> types to arrays (e.g. List<Item> -> Item[]). My deserializations worked as expected, afterward.

While this isn't a fix, it's a viable workaround if you have access to the source throwing the exception, and you need to get past it quickly (mine was a time-sensitive matter, hence determining the work-around instead of waiting on a fix).

 

Thanks for that. I'll give that a try. FWIW, the issue goes away if I compile with the .Net 2.0 Subset option. i.e. it only breaks when using .Net 2.0 Full

 

@JoshPeterson Thanks!

 

@JoshPeterson Inevitable follow up question; when do you think this will be available in 5.0?