MonoTouch Build: ld: symbol(s) not found for architecture armv7

Question

I have a MonoTouch project which builds and runs fine on i386/iOS Simulator. The project references a native (Obj-C) library, which I converted to a MonoTouch DLL by using the btouch process as described in Xamarin's BindingSample: https://github.com/xamarin/monotouch-samples/tree/eb640165f0485ff59b2f80e73ccff382bf4f2083/BindingSample/src/binding So my makefile builds all three architectures (i386, armv6 and armv7), then combines the three outputs to one 'Universal' library, and finally uses btouch to generate a MonoTouch DLL. To be sure that my universal library contains all three architectures, I checked with `lipo -info`, and indeed, it contains i386, armv6 and armv7. However, when I'm building for deployment on an actual iOS device, I get the following errors: ``` Undefined symbols for architecture armv7: "_ABAddressBookCreate", referenced from: -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prom…

Accepted Answer

found the problem: the native library depended on the AddressBook framework, and I forgot to include it in the AssemblyInfo.cs of the API definition project:

```
[assembly: LinkWith ("libContactsTokenFieldViewUniversal.a", LinkTarget.Simulator | LinkTarget.ArmV6 | LinkTarget.ArmV7, ForceLoad = true, Frameworks="AddressBook Foundation")]
```

MonoTouch Build: ld: symbol(s) not found for architecture armv7

Solution

Problem