Question

I am using the RedLaser binding for Monotouch to create an app that scans barcodes. It works nice like a charm on iSimulator, but when I try deploying to a real device (switch running environment Debug|Simulator -> Debug|iPhone), I cannot even build.

I am using MonoTouch 6.0.8, MonoDevelop 3.0.6, XCode 4.5.2.

Also, I am using iphone 3GS device for deployment. The device is running iOS 6.0 and that is what the target of my application is. I found a bug on MonoTouch bugzilla that has the same erro code here, which suggested changing the target from 6.0 -> 5.1. I did that and did not change a thing.

I have my provisioning profile is setup, verified and installed on Xcode Organiser and same for the Certificate. I can see both are fine.

The Build Output is below, any help would be highly appreciated.
Thanks

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++
-miphoneos-version-min=5.1 -gdwarf-2 -arch armv7 -std=c99 -I/Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk
-c /var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/main.armv7.m
-o /Users/hasnainaltaiar/Dev/Leopard/SVN/trunk/LD6419/Platforms/iOS/Leopard.Delivery.iOS/Leopard.Delivery.iOS/obj/Release/mtouch-cache/main..armv7.cache.M0wr77LlBANF6vKjGqQvyVnmWEk=.o
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++
-miphoneos-version-min=5.1 -gdwarf-2 -arch armv7 -std=c99 -I/Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk
-c /var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/registrar.m
-o /Users/hasnainaltaiar/Dev/Leopard/SVN/trunk/LD6419/Platforms/iOS/Leopard.Delivery.iOS/Leopard.Delivery.iOS/obj/Release/mtouch-cache/registrar.armv7.cache.Zar9bxp0AZNxwVcgrsOMEFHv0k4=.o
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++
-Wl,-no_pie -miphoneos-version-min=5.1 -gdwarf-2 -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/Mono.Security.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/Leopard.Domain.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/RedLaser.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/System.Core.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/mscorlib.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/System.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/monotouch.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/LeopardDeliveryiOS.exe.armv7.o
/Users/hasnainaltaiar/Dev/Leopard/SVN/trunk/LD6419/Platforms/iOS/Leopard.Delivery.iOS/Leopard.Delivery.iOS/obj/Release/mtouch-cache/main..armv7.cache.M0wr77LlBANF6vKjGqQvyVnmWEk=.o
/Users/hasnainaltaiar/Dev/Leopard/SVN/trunk/LD6419/Platforms/iOS/Leopard.Delivery.iOS/Leopard.Delivery.iOS/obj/Release/mtouch-cache/registrar.armv7.cache.Zar9bxp0AZNxwVcgrsOMEFHv0k4=.o
-o /var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/LeopardDeliveryiOS
-framework CFNetwork -framework Foundation -framework UIKit -framework AudioToolbox -framework QuartzCore -framework CoreGraphics -framework
AVFoundation -framework CoreMedia -framework CoreVideo -framework
OpenGLES -framework Security -framework SystemConfiguration -lz
-liconv -u _mono_pmip -u _monotouch_create_managed_ref -u _monotouch_release_managed_ref -u _monotouch_IntPtr_objc_msgSend_IntPtr -u _monotouch_IntPtr_objc_msgSendSuper_IntPtr -u _CloseZStream -u _CreateZStream -u _Flush -u _ReadZStream -u _WriteZStream -lmono-2.0 -lmonotouch -L/Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/lib -lgcc_eh -force_load /var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/libRedLaserSDK.a
Process exited with code 1, command:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/g++
-Wl,-no_pie -miphoneos-version-min=5.1 -gdwarf-2 -arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/Mono.Security.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/Leopard.Domain.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/RedLaser.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/System.Core.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/mscorlib.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/System.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/monotouch.dll.armv7.o
/var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/LeopardDeliveryiOS.exe.armv7.o
/Users/hasnainaltaiar/Dev/Leopard/SVN/trunk/LD6419/Platforms/iOS/Leopard.Delivery.iOS/Leopard.Delivery.iOS/obj/Release/mtouch-cache/main..armv7.cache.M0wr77LlBANF6vKjGqQvyVnmWEk=.o
/Users/hasnainaltaiar/Dev/Leopard/SVN/trunk/LD6419/Platforms/iOS/Leopard.Delivery.iOS/Leopard.Delivery.iOS/obj/Release/mtouch-cache/registrar.armv7.cache.Zar9bxp0AZNxwVcgrsOMEFHv0k4=.o
-o /var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/LeopardDeliveryiOS
-framework CFNetwork -framework Foundation -framework UIKit -framework AudioToolbox -framework QuartzCore -framework CoreGraphics -framework
AVFoundation -framework CoreMedia -framework CoreVideo -framework
OpenGLES -framework Security -framework SystemConfiguration -lz
-liconv -u _mono_pmip -u _monotouch_create_managed_ref -u _monotouch_release_managed_ref -u _monotouch_IntPtr_objc_msgSend_IntPtr -u _monotouch_IntPtr_objc_msgSendSuper_IntPtr -u _CloseZStream -u _CreateZStream -u _Flush -u _ReadZStream -u _WriteZStream -lmono-2.0 -lmonotouch -L/Developer/MonoTouch/SDKs/MonoTouch.iphoneos.sdk/usr/lib -lgcc_eh -force_load /var/folders/_l/0pvrtd6x6qg83sz4_0906b5c0000gn/T/tmpee06e1f.tmp/libRedLaserSDK.a
Undefined symbols for architecture armv7:
“_OBJC_CLASS_$_CLLocationManager”, referenced from:
objc-class-ref in libRedLaserSDK.a(StatusManager.o) ld: symbol(s) not found for architecture armv7 collect2: ld returned 1
exit status

error MT5202: Native linking failed. Please review the build log.

———————- Done ———————-

Project does not have bundle identifier specified. Generated
‘leoparddeliveryios’ to match provisioning profile.

Answer 1

From the error message:

Undefined symbols for architecture armv7: "_OBJC_CLASS_$_CLLocationManager"

It seems the library was updated and now has a dependency on CoreLocation.

Edit the [LinkWith] attribute inside the binding project and add CoreLocation to it’s Frameworks property, then rebuild the bindings (and then rebuild your application). If this fixes the issue then please file a bug report so it can be fixed in the github repository.

Note: As a quick test you can also add the following option to both your Debug and Release configuration of your project (in the mtouch additional arguments in your project’s Options inside MonoDevelop).

-gcc_args="-framework CoreLocation"

That will result in the same – except you’ll need to copy that fix for every project (and configuration) you’re using (so it’s useful to spot the issue but not a really good way to fix it).