Question

I am running Xcode 4.2 with an imported IOS 6 SDK (older Mac incapable of running XCode 4.5). My app is configured with an iOS Deployment Target of 4.3, a Base SDK of 6.0, and Architectures of armv7 only.

I am trying to update my previously working app to request permission to access a user’s address book, which is now a requirement for iOS 6 (using the new iOS 6 functions). Unfortunately, I am receiving the following Apple Mach-O Linker Error:

Ld
/Users/Blake/Library/Developer/Xcode/DerivedData/MyApp-ercibgqhpidlmwflixmwbvruyctz/Build/Products/Debug-iphoneos/MyApp.app/MyApp
normal armv7
cd /Users/Blake/Desktop/MyApp/MyApp
setenv IPHONEOS_DEPLOYMENT_TARGET 4.3
setenv PATH “/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin”
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/clang -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk
-L/Users/Blake/Library/Developer/Xcode/DerivedData/MyApp-ercibgqhpidlmwflixmwbvruyctz/Build/Products/Debug-iphoneos
-L/Users/Blake/Desktop/MyApp/MyApp/../../../Downloads/ScannerKit-Latest/Demo/Libraries/ScannerKit
-F/Users/Blake/Library/Developer/Xcode/DerivedData/MyApp-ercibgqhpidlmwflixmwbvruyctz/Build/Products/Debug-iphoneos
-filelist /Users/Blake/Library/Developer/Xcode/DerivedData/MyApp-ercibgqhpidlmwflixmwbvruyctz/Build/Intermediates/MyApp.build/Debug-iphoneos/MyApp.build/Objects-normal/armv7/MyApp.LinkFileList
-dead_strip -all_load -lstdc++ -fobjc-arc -miphoneos-version-min=4.3 -framework AddressBook -framework AddressBookUI -framework UIKit -framework Foundation -framework CoreGraphics -lScannerKit -framework AVFoundation -framework CoreMedia -framework SystemConfiguration
-framework CoreVideo -liconv -framework AudioToolbox -framework QuartzCore -o
/Users/Blake/Library/Developer/Xcode/DerivedData/MyApp-ercibgqhpidlmwflixmwbvruyctz/Build/Products/Debug-iphoneos/MyApp.app/MyApp

Undefined symbols for architecture armv7:
“_ABAddressBookRequestAccessWithCompletion“, referenced from:
-[ServerConnect parserDidEndDocument:] in ServerConnect.o “_ABAddressBookGetAuthorizationStatus“, referenced from:
-[ServerConnect parserDidEndDocument:] in ServerConnect.o “_ABAddressBookCreateWithOptions“, referenced from:
-[ServerConnect parserDidEndDocument:] in ServerConnect.o ld: symbol(s) not found for architecture armv7 clang: error: linker
command failed with exit code 1 (use -v to see invocation)

My best guess is that XCode 4.2 is looking in the iPhoneOS5.0.sdk instead of my iPhoneOS6.0.sdk for architecture armv7. However, I am unable to see where I can fix this problem. Has anyone else encountered this problem before? Thanks for any help in advance!

My Code (for Reference):

// Fetch the address book 
//Check if we are using iOS6
if ([self isABAddressBookCreateWithOptionsAvailable]) {
        ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, NULL);

        if (ABAddressBookGetAuthorizationStatus() == 0) {
            ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error) {
                // First time access has been granted
                [self searchForPersonInAddressBook:addressBook withName:fullName];
            });
        }
        else if (ABAddressBookGetAuthorizationStatus() == 3) {
            // The user has previously given access
            [self searchForPersonInAddressBook:addressBook withName:fullName];
        }
        else {
            // The user has previously denied access
            UIAlertView *deniedAccess=[[UIAlertView alloc] initWithTitle:@"Unable to Access Address Book" message:@"Change App Privacy Settings" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            [deniedAccess show];
        }
    }
    //If using iOS 4/5
    else {
        ABAddressBookRef addressBook = ABAddressBookCreate();
        [self searchForPersonInAddressBook:addressBook withName:fullName];
    }
}

- (void)searchForPersonInAddressBook:(ABAddressBookRef )ab
                withName:(NSString *)fn
{
// Search for the person in the address book
CFArrayRef person = ABAddressBookCopyPeopleWithName(ab, (__bridge CFStringRef)fn);
// Display message if person not found in the address book 
if ((person != nil) && (CFArrayGetCount(person) == 0)) {
    // Show an alert if name is not in Contacts
    UIAlertView *saveContact=[[UIAlertView alloc] initWithTitle:@"Save New Contact to iPhone?" message:fn delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Save!", nil];
    saveContact.tag = 2;
    [saveContact show];
}
}

- (BOOL)isABAddressBookCreateWithOptionsAvailable
{
     return &ABAddressBookCreateWithOptions != NULL;
}

Answer 1

I solved my problem through weak linking the AddressBook Frameworks in the “Link Binary with Libraries” Section of my Target’s Build Phases Settings (“Optional” instead of “Required”).

Also, I believe there is an XCode4.2 bug in which it duplicates the device destination. For some reason, after choosing the duplicate, my app was able to compile (See the following link: How to access weak linked framework in iOS?).