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

Question

I have a MonoTouch project that builds and works fine on i386 / iOS Simulator. The project references the native (Obj-C) library, which I converted to the MonoTouch library using the btouch process, as described in the Xamarin BindingSample:

https://github.com/xamarin/monotouch-samples/tree/eb640165f0485ff59b2f80e73ccff382bf4f2083/BindingSample/src/binding

So, my makefile creates all three architectures (i386, armv6 and armv7), then combines the three outputs into one “universal” library and finally uses btouch to generate the MonoTouch library.

To ensure that my universal library contains all three architectures, I checked with lipo -info , and indeed, it contains i386, armv6 and armv7.

However, when I create for deployment on a real iOS device, I get the following errors:

 Undefined symbols for architecture armv7: "_ABAddressBookCreate", referenced from: -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_ABAddressBookCopyArrayOfAllPeople", referenced from: -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_ABAddressBookGetPersonCount", referenced from: -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_ABRecordCopyValue", referenced from: -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_kABPersonFirstNameProperty", referenced from: -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_kABPersonLastNameProperty", referenced from: -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o) -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_ABMultiValueGetCount", referenced from: -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_ABMultiValueCopyLabelAtIndex", referenced from: -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_ABMultiValueCopyValueAtIndex", referenced from: -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_kABPersonEmailProperty", referenced from: -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) "_kABPersonPhoneProperty", referenced from: -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o) ld: symbol(s) not found for architecture armv7 collect2: ld returned 1 exit status mtouch exited with code 1 

What am I doing wrong?

Answer 1

found the problem: the native library depended on the AddressBook structure, 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")]