Using assemblies compiled from IL with .NET Core & Xamarin

Question

Updated with a solution that works for me. See the bottom of this question.

Context:
I needed a way to evaluate the size of a generic type for the p

Answer 1

Ok, this is the result of my research (based on https://github.com/dotnet/corefx/tree/master/src/System.Runtime.CompilerServices.Unsafe and https://github.com/jvbsl/ILProj):

global.json:

{
  "msbuild-sdks": {
    "Microsoft.NET.Sdk.IL": "3.0.0-preview-27318-01"
  }
}

ILProj\ILProj.ilproj:

    
        netstandard2.0
        3.0.0-preview-27318-01
        include\netstandard
        include\netstandard
        include\netcoreapp
        include\netcoreapp
        $(IlasmFlags) -INCLUDE=$(IncludePath)
    

ILProj\include\netstandard\coreassembly.h:

#define CORE_ASSEMBLY "System.Runtime"

// Metadata version: v4.0.30319
.assembly extern CORE_ASSEMBLY
{
  .publickeytoken = ( B0 3F 5F 7F 11 D5 0A 3A )
  .ver 4:0:0:0
}

ILProj\Class.il

#include "coreassembly.h"

.assembly ILProj
{
  .ver 1:0:0:0
}

.module ILProj.dll

.class public abstract auto ansi sealed beforefieldinit ILProj.Class
  extends [CORE_ASSEMBLY]System.Object
{
  .method public hidebysig static int32 Square(int32 a) cil managed
  {
    .maxstack 2
    ldarg.0
    dup
    mul
    ret
  }
}

If you have difficulties to put it all together, then look at the example here: https://github.com/Konard/ILProj