Bug 56331 - /Users/bert/Projects/Admove/Admove2IOS/MTOUCH: Error MT5216: Native linking failed for '/Users/bert/Projects/Admove/Admove2IOS/obj/iPhone/Debug/mtouch-cache/arm64/libInfinitePeripherals.Sdk.iOS.dll.dylib'.
Summary: /Users/bert/Projects/Admove/Admove2IOS/MTOUCH: Error MT5216: Native linking f...
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: unspecified
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2017-05-13 08:07 UTC by Bert Degenhart Drenth
Modified: 2017-11-08 14:12 UTC (History)
6 users (show)

Is this bug a regression?: ---
Last known good build:

Build log (180.71 KB, text/plain)
2017-05-13 08:07 UTC, Bert Degenhart Drenth

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Description Bert Degenhart Drenth 2017-05-13 08:07:29 UTC
Created attachment 22155 [details]
Build log

In our product Axiell move we use a native library to control a Linea Pro barcode and RFID scanner.
With mono 5.0 the compilation suddenly ends with a compiler error 1
With mono 4.8 suddenly get the above problem.

Just to be sure that the problem is not in the native library itself we downloaded the latest version from the Infinea web site (the manufacturer of the scanner and linked that version in the software. The problem remained. 
The original compiler error problem was filed with Microsoft under case number 117051115721542
Microsoft recommended to revert back to the 4.8 version of the Mono framework. 

Not being able to link means that we are stuck and cannot submit an update to the app store.
Comment 1 Bert Degenhart Drenth 2017-05-22 11:13:15 UTC
There is a workaround for the mono 5.0 problem:


Placing this in the project definition forces Visual Studio to use the mcs compiler instead of csc.exe. After doing this we get exactly the same error as with the 4.8 framework. 

So still stuck ..
Comment 2 Rolf Bjarne Kvinge [MSFT] 2017-08-29 06:45:18 UTC
There seems to be a bug where the third-party binding library InfinitePeripherals.Sdk.iOS.dll does not correctly state that the corresponding native library requires CoreGraphics.

Possible fixes:

* Fix the third-party binding library (or request a fix from the vendor). The library has a [LinkWith] attribute that must contain the required frameworks: [assembly: LinkWith ("libdtdev.a", Frameworks = "CoreGraphics", ...)]
* Add '--framework CoreGraphics' to the additional mtouch arguments in the project's iOS Build options.
* Add '--gcc_flags "-framework CoreGraphcis"' to the additional mtouch arguments in the project's iOS Build options.
* Disable incremental builds in the project's iOS Build options.
Comment 3 Bert Degenhart Drenth 2017-11-08 14:12:29 UTC
switching off incremental builds was for me the easiest way to overcome the problem. I will check the vendors support pages for an update later.
But thanks Rolf for this solution.