I have been stuck with the same bug the last few days when archiving for Xamarin.iOS. When I archive for iOS, it would take about 6-8 minutes before showing me the following error below.
MyProject.iOS/obj/iPhone/Debug/mtouch-cache/armv7/Syncfusion.Pdf.Portable.dll.s(1168720,8): error GDC116A36: can not encode offset '0x100FD98' in resulting scattered relocation.
The assembly 'Syncfusion.Pdf.Portable.dll' can't be AOT-compiled for 32-bit architectures because the native code is too big for the 32-bit ARM architecture.
I followed Microsoft forums and found that it was a Xamarin bug that should be resolved within the latest version. I have the latest Xcode 11.3.1 and latest Xamarin (Visual Studio 8.4.1) and I'm still getting errors.
I tried deleting obj and bin to and cleaning my solution. Any help would be greatly appreciated!
Apple now requires all apps to be 64 bit. Be sure you that don't have any old 32 bit architectures selected in your project build settings.