Bug 35439 - Unclear error message when Xcode license is not accepted
Summary: Unclear error message when Xcode license is not accepted
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: XI 9.4 (iOS 9.2)
Hardware: PC Mac OS
: --- enhancement
Target Milestone: Future Cycle (TBD)
Assignee: Bugzilla
Depends on:
Reported: 2015-10-31 19:39 UTC by Cody Beyer (MSFT)
Modified: 2017-10-02 11:14 UTC (History)
3 users (show)

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

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Description Cody Beyer (MSFT) 2015-10-31 19:39:05 UTC
### Description

Recently, instead of displaying a more relevant error, the following is reported:

>Error MT5306: Failed to create the a fat library. Please review the build log. (MT5306) 

### Steps to Reproduce

1. Update to Xcode 7.1
2. Do not open Xcode and do not accept its license 
3. Build Xamairn.iOS app

### Expected Results

Error message along the lines of:

>Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo.

should be raised

### Actual Results

Error message as described in the description is raised

=== Xamarin Studio ===

Version 5.10 (build 860)
Installation UUID: 73204efb-3f52-4561-bfd0-1a9af26f9341
	Mono 4.2.1 (explicit/8862921)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 402010091

=== Xamarin.Profiler ===

Not Installed

=== Apple Developer Tools ===

Xcode 7.1 (9079)
Build 7B91b

=== Xamarin.Android ===

Version: (Business Edition)
Android SDK: /Users/codybeyer/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		4.0.3 (API level 15)
		4.4   (API level 19)
		5.0   (API level 21)

SDK Tools Version: 24.4.1
SDK Platform Tools Version: 23.0.1
SDK Build Tools Version: 23.0.1

Java SDK: /usr
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

=== Xamarin Android Player ===

Version: 0.6.5
Location: /Applications/Xamarin Android Player.app

=== Xamarin.iOS ===

Version: (Business Edition)
Hash: 9ce9e8b
Branch: master
Build date: 2015-10-28 19:11:03-0400

=== Xamarin.Mac ===

Version: (Business Edition)

=== Build Information ===

Release ID: 510000860
Git revision: 7c46a0b709d51ad5d5a5ed90a4671cc7b6928e62
Build date: 2015-10-29 17:17:52-04
Xamarin addins: b9337905aca5dc276190d78819728a59cda33a43
Build lane: monodevelop-lion-cycle6

=== Operating System ===

Mac OS X 10.11.1
Darwin Codys-MacBook-Pro.local 15.0.0 Darwin Kernel Version 15.0.0
    Sat Sep 19 15:53:46 PDT 2015
    root:xnu-3247.10.11~1/RELEASE_X86_64 x86_64
Comment 2 Brendan Zagaeski (Xamarin Team, assistant) 2015-11-02 12:53:29 UTC
## A hint for how to reproduce without re-installing Xcode

In case it might be helpful for easier reproductions of the problem, you can simply move or delete the following file (it's a system-wide preferences file):

> /Library/Preferences/com.apple.dt.Xcode.plist

That file stores the latest accepted license agreement:

> $ plutil -p /Library/Preferences/com.apple.dt.Xcode.plist
> {
>   "IDEXcodeVersionForAgreedToGMLicense" => "7.1"
>   "IDELastGMLicenseAgreedTo" => "EA1327"
> }

If that file is _not_ present then this "Failed to create the a fat library" error _will_ happen when building for device.

## Regression status: not an immediate regression

This problem has affected older versions of Xcode + Xamarin.iOS too. See for example [1], a forum thread from January 2015.

[1] http://forums.xamarin.com/discussion/31493/mtouchtask-error-mt5206-failed-to-create-the-a-fat-library-please-review-the-build-log-mt5206/p1

## Additional context from the diagnostic build output for a failing build

(To show how the error from the Xcode toolchain appears in the build output)

> Environment variables being passed to the tool:
> Xamarin.iOS 9.3.1 Business Edition using framework: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.1.sdk
> Process exited with code 69, command:
> /usr/bin/lipo /Users/macuser/Projects/UnifiedSingleViewIphone1/UnifiedSingleViewIphone1/obj/iPhone/Debug/mtouch-cache/64/Output/UnifiedSingleViewIphone1 /Users/macuser/Projects/UnifiedSingleViewIphone1/UnifiedSingleViewIphone1/obj/iPhone/Debug/mtouch-cache/32/Output/UnifiedSingleViewIphone1 -create -output /Users/macuser/Projects/UnifiedSingleViewIphone1/UnifiedSingleViewIphone1/bin/iPhone/Debug/UnifiedSingleViewIphone1.app/UnifiedSingleViewIphone1
> Agreeing to the Xcode/iOS license requires admin privileges, please re-run as root via sudo.
Comment 3 Cody Beyer (MSFT) 2016-09-28 16:23:55 UTC
This no longer occurs. In the latest C8SR0 version, we get the following when the license is not accepted:

Starting connection to Mac clb-macbook...
Xcode license must be accepted in order to be connected and working against the Mac
Disconnected from Mac clb-macbook (
Comment 4 Brendan Zagaeski (Xamarin Team, assistant) 2016-09-28 18:43:38 UTC
It looks like the original report in Comment 0 was filed on Mac OS using Xamarin Studio (rather than in Visual Studio on Windows as in Comment 3).  I still get the original behavior from Comment 0 when building for device in on Mac in Xamarin Studio, so I am reopening.

## Version info

BAD: Xamarin.iOS (3983064) + Xamarin Studio (fa52f026)