Getting dyld_fatal_error after updating to Xcode 6

Question

I just recently downloaded Xcode 6 beta 4, and my swift project compiles with no errors but before it gets to my code I get a dyld_fatal_error just above start in the call stack.

and a breakpoint in some assembly code with a nop instruction

The console error I get is

dyld: lazy symbol binding failed: Symbol not found: __TFSsa6C_ARGVGVSs13UnsafePointerGS_VSs4Int8__
  Referenced from: /Users/username/Library/Developer/Xcode/DerivedData/Sudoku-dhrdonaeqzsgcvewndimxbbsltnc/Build/Products/Debug/Sudoku.app/Contents/MacOS/Sudoku
  Expected in: /Users/username/Library/Developer/Xcode/DerivedData/Sudoku-dhrdonaeqzsgcvewndimxbbsltnc/Build/Products/Debug/Sudoku.app/Contents/MacOS/../Frameworks/libswift_stdlib_core.dylib

dyld: Symbol not found: __TFSsa6C_ARGVGVSs13UnsafePointerGS_VSs4Int8__
  Referenced from: /Users/username/Library/Developer/Xcode/DerivedData/Sudoku-dhrdonaeqzsgcvewndimxbbsltnc/Build/Products/Debug/Sudoku.app/Contents/MacOS/Sudoku
  Expected in: /Users/username/Library/Developer/Xcode/DerivedData/Sudoku-dhrdonaeqzsgcvewndimxbbsltnc/Build/Products/Debug/Sudoku.app/Contents/MacOS/../Frameworks/libswift_stdlib_core.dylib

Just so you know the project still compiles, and runs fine with Xcode 6 beta 3.

Answer 1

This problem still occurs in Xcode 7, and it can happen for a variety of reasons (it seems). In my case, the iOS app with an included framework:

1. ran on the simulator fine
2. gave the error you described on the device

The answer was to NOT use linked libraries but rather Embedded Binaries under General.

Also see here: https://stackoverflow.com/a/34052368/8047

Answer 2

You'll get this if your scheme has "Guard Edges" enabled in diagnostics when running on an actual device. "Guard Edges" only works in the simulator.

Answer 3

I also faced the same issue and tried all the solution given above without any luck.

then what I have done to resolve that I really don’t have much I idea about. So there is Certificated called “apple worldwide developer relations certificate authority” in System group in keychain Access and due to some profile and certificate issue I randomly mark this certificate “Always trusted” from “Use System Defaults”. So this is causing this “dyld_fatal_error” crash to me. when I revert it back to “Use System Defaults” crash got resolved. So guys if you are tried all the possible option to resolve this crash and didn’t succeed yet, try this also. It helped me, may help you as well.

Found this about this certificate.

Answer 4

I have just had this problem trying to link a custom iOS framework to my project, so for anyone out there who has this problem, it's to do with the copy files build phase.

I think that this error results when a file cannot be found. So create a copy files build phase in the appropriate target in your project. Then add the file (in my case the custom framework) to this phase (if it's a framework make sure to select the 'Frameworks' destination).

Answer 5

I was using cocoapods and had this problem as well when I updated to deploy target iOS 8 and added use_frameworks! to my Podfile. I was able to fix it by adding the following line to my Podfile:

link_with 'TargetName1', 'TargetName2', etc.

Might work with ProjectName as well

Answer 6

Xcode 8.

Clean and build didn't work. I deleted the cache, deleted Derived data. After that, my pods configuration was broken, so i needed to install pods again. Pods Target configuration was set to a very old Valid architectures. setting to armv7 and armv7s, was ok to compile and no problems