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Steps to reproduce:
1) Create new XM Modern App
2) Add a reference to a nuget using Xamarin.Mac. Xamarin.Forms.126.96.36.1996-pre6 for example)
3) Swap to i386
4) Build and run
Native type size mismatch between Xamarin.Mac.dll and the executing architecture. Xamarin.Mac.dll was built for 64-bit, while the current process is 32-bit.
at <unknown> <0xffffffff>
at (wrapper managed-to-native) object.wrapper_native_0xa2770 () <0x00012>
at ObjCRuntime.Runtime.EnsureInitialized () [0x0004a] in /Users/donblas/Programming/macios/cycle9/xamarin-macios/src/ObjCRuntime/Runtime.mac.cs:118
at AppKit.NSApplication.Init () [0x00017] in /Users/donblas/Programming/macios/cycle9/xamarin-macios/src/AppKit/NSApplication.cs:56
at Mobile32.MainClass.Main (string) [0x00001] in /Users/donblas/Projects/Mobile32/Main.cs:9
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) [0x00051] in <2076c811a8514765bf1d226d27b7acb5>:0
This is because we first call SwapOutReferenceAssembly in driver.cs with the reference, not file name, don't swap it out. And then later do.
This is likely always been broken, but since we fall back to the "reference", which is x86_64, we never noticed. i386 is not common.
This is fixed in master and will be released in the 15.5 release.
Until then the simplest work around would be to use a post-build target (https://github.com/xamarin/mac-samples/tree/master/UseMSBuildToCopyFilesToBundleExample) to a 32-bit Xamarin.Mac from
into your final bundle. In this application, it would be the Full, since it is using the Full (Not Mobile/Modern) version.