Bug 29839 - [3.11] Native Linking Error when trying to link a static library in iOS
Summary: [3.11] Native Linking Error when trying to link a static library in iOS
Alias: None
Product: Visual Studio Extensions
Classification: Xamarin
Component: iOS ()
Version: 3.11 (C5)
Hardware: PC Mac OS
: High major
Target Milestone: 3.11.1 (C5SR1)
Assignee: Bugzilla
: 30262 ()
Depends on:
Reported: 2015-05-07 10:54 UTC by John Miller [MSFT]
Modified: 2015-10-19 09:48 UTC (History)
13 users (show)

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

Log files (29.70 KB, application/zip)
2015-05-07 11:59 UTC, Brendan Zagaeski (Xamarin Team, assistant)

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Description John Miller [MSFT] 2015-05-07 10:54:38 UTC

   Native linking an iOS static library fails when using XVS with file not found and directory not found errors. 
**Steps to Reproduce:**

   1. Run the attached project in VS 2013. 
   2. Connect to build host. 
   3. Build the App project.

**Actual Results:**

Error	4	Native linking error: file not found: C:/NativeLinkTesting/NativeLinkTesting/libVidyoClientLib.a	NativeLinkTesting
Error	3	Native linking error: warning: directory not found for option '-LC:/NativeLinkTesting/NativeLinkTesting'	NativeLinkTesting
Error	5	Native linking failed. Please review the build log and the user flags provided to gcc: -LC:/NativeLinkTesting/NativeLinkTesting -lVidyoClientLib -force_load C:/NativeLinkTesting/NativeLinkTesting/libVidyoClientLib.a	NativeLinkTesting
Error	6	Native linking failed. Please review the build log.	NativeLinkTesting

**Expected Results:**

   Compiles successfully.

**Build Date & Platform:**

   XVS 3.11
   XI 8.10

**Additional Information:**

   The same project can be opened in XS on Mac and it will build successfully.
Comment 2 Brendan Zagaeski (Xamarin Team, assistant) 2015-05-07 11:59:19 UTC
Created attachment 11119 [details]
Log files

## Partial workaround

The following workaround works for me on XamarinVS 3.11.445 + Xamarin.iOS (remove the > greater-than character from the beginning of the line):

> <MtouchExtraArgs>-gcc_flags "-L${TargetDir}/../../../ -lVidyoClientLib -force_load ${TargetDir}/../../../libVidyoClientLib.a"</MtouchExtraArgs>

### Further explanation

The idea is to replace `${ProjectDir}` with one of the other "special variables" that is valid in the MtouchExtraArgs field. The current behavior of these variable seems to _mostly_ match the "Results on XVS 3.8.150" in Bug 25758, Comment 3. The problem is that the `${ProjectDir}` variable has reverted to expanding to the wrong `C:` path (similar to what happened around XVS 3.5 per Bug 23164, Comment 0).

## Optional simpler test case

The test case and steps to reproduce from Bug 25758, Comment 0 are sufficient to reproduce this problem. (And that test case is 100% code that I created from scratch, including the native library, so you're welcome to use that test case any way you like).
Comment 3 Brendan Zagaeski (Xamarin Team, assistant) 2015-05-07 12:19:56 UTC
Setting status to "confirmed" as per comment 2.

## Additional detailed regression status: REGRESSION between XVS 3.9 and XVS 3.11

GOOD: XVS 3.9.547  (20fd2f0) + Xamarin.iOS    (f7736a4)
BAD:  XVS 3.11.445 (5061f92) + Xamarin.iOS (6481535)
BAD:  XVS 3.11.507 (dfac85e) + Xamarin.iOS  (1b48440)
Comment 10 Naqeeb 2015-05-12 13:28:57 UTC
I have checked this issue with XVS 3.11.521 + XI and now it build/run successfully without any error. 

Screencast: http://www.screencast.com/t/gvzyjfGC2nPk

Hence closing this issue.
Comment 11 Brendan Zagaeski (Xamarin Team, assistant) 2015-05-21 11:55:18 UTC
*** Bug 30262 has been marked as a duplicate of this bug. ***