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Created attachment 3467 [details]
Patch to add support for Xamarin.iOS

As you may know, Xamarin is Microsoft's toolkit for enabling developers to write apps for mobile platforms using C#. However, because of Apple's strict rules on dynamic code generation, Xamarin.iOS apps are AOT compiled, and all native libraries used in the project must be statically-linked.

When attempting to statically link libSDL2.a with a Xamarin.iOS project, it results in a build-time linker error about an "undefined symbol _SDL_main", indicating that the usual redefinition of main() doesn't work in this context. (Not surprising, since C# has a different signature for its Main function.)

To overcome this limitation and to enable use of SDL in Xamarin apps, I propose the attached patch. This patch handles the redefinition of main() and adds an SDL_XamarinRunApp() function, similar to SDL_WinRTRunApp(). All the relevant code is sectioned off inside #ifdef XAMARIN blocks, so normal iOS development is not affected.

I've tested this patch on iOS and tvOS, and it works like a charm. However, I'm sure it can be improved -- especially in regard to naming and organization. Additionally, this currently requires a compiler flag (-DXAMARIN) to build. Is that acceptable, or is there a better way to enable this feature?