How to pass --extra-types-file parameters to il2cpp.exe?

I'm looking at explicitly specify some value type to an generic type (which is an internal type of an external component) via il2cpp_extra_types.txt as suggested here:
https://forum.unity.com/threads/il2cpp-type-makegenerictype-work-around.311926/

However, simply putting the il2cpp_extra_types.txt file in the Assets folder did not work and from the logs, it appears that the issue is the il2cpp_extra_types.txt filepath didn't get passed along to il2cpp.exe (I also notice it did not pick up Data/il2cpp/il2cpp_default_extra_types.txt).

Here's the arguments according to the log file:

Invoking il2cpp with arguments: --convert-to-cpp --emit-null-checks --enable-array-bounds-check --dotnetprofile="unityjit" --map-file-parser="C:\Program Files\Unity\Hub\Editor\2018.1.5f1\Editor\Data\Tools\MapFileParser\MapFileParser.exe" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\Assembly-CSharp.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\UnityEngine.UI.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\I18N.CJK.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\I18N.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\I18N.MidEast.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\I18N.Other.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\I18N.Rare.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\I18N.West.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\UnityEngine.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\Autofac.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\mscorlib.dll" --assembly="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Data\Managed\System.dll" --generatedcppdir="F:\Source\Repos\MyProject\MyProject.Unity\Temp\StagingArea\Il2CppOutputProject\Source\il2cppOutput"​

I'm on 2018.1.5f1 which I verified the il2cpp.exe supports the --extra-types-file option.

Any ideas on how this can be configured correctly?

 

Hi Josh,

Interestingly I didn't find the --extra-types-file option on Unity2017.4.2f2 but saw that it came back on Unity2018.1.5f1 and assume there are changes on how this gets consumed.


So the original issue is that we're hitting an ExecutionEngineException related to our usage of AutoFac's Keyed Service feature.

Specifically, IL2CPP only generated the code for reference types:

Autofac.Features.Indexed.KeyedServiceIndex`2<System.Object,System.Object>

Our usage, however, is that we're using a value type (i.e. an enum) as the key and hence require the following to get generated:

Autofac.Features.Indexed.KeyedServiceIndex`2<MyEnum,System.Object>

Unfortunately, since KeyedServiceIndex is an internal type to the AutoFac assembly, we were not able to work around it by simply adding dummy code that new up the concrete type to hint to IL2CPP.

Modifying AutoFac to expose the type so that we can do the above is an alternative but I was really hoping to leverage a generic solution like Il2cpp_extra_types.txt to be able to hint to IL2CPP without requiring code changes. Especially since there's an equivalent concept of TypeInstantiation in .NET Native.


In this particular case, I think we would be able to work around it by changing our usage of the key to a string (MyEnum.ToString()) instead of the enum directly so that the reference types version would be used.