Command failed due to signal Segmentation fault 11

Question

I m getting the error         Command failed due to signal  Segmentation fault  11       when trying to compile my Swift app  I m using Xcode 6 1  trying to build for an iPhone 5 on iOS 8 1   My Code  import UIKit  class ViewController  UIViewController         IBOutlet weak var username  UITextField       IBAction func signIn sender  AnyObject             PFUser logInWithUsernameInBackground username text  password  mypass                  user  PFUser   error  NSError   - gt  Void in             if user    nil                   println  Logged In                 else                    func myMethod                         var user   PFUser                       user username   username text                     user password                           user signUpInBackgroundWithBlock                            succeeded  Bool   error  NSError   - gt  Void in                         if error    nil                                  Hooray  Let them use the app now                            else                                   println  Signed Up                                                                                   println error                                    override func viewDidLoad             super viewDidLoad              Do any additional setup after loading the view  typically from a nib          Parse setApplicationId  key here              override func didReceiveMemoryWarning             super didReceiveMemoryWarning              Dispose of any resources that can be recreated            And the error text   CompileSwift normal arm64  Users Alec Desktop Re-Chat Re-Chat Re-Chat ViewController swift     cd  Users Alec Desktop Re-Chat Re-Chat      Applications Xcode app Contents Developer Toolchains XcodeDefault xctoolchain usr bin swift -frontend -c -primary-file  Users Alec Desktop Re-Chat Re-Chat Re-Chat ViewController swift  Users Alec Desktop Re-Chat Re-Chat Re-Chat AppDelegate swift -target arm64-apple-ios8 0 -Xllvm -aarch64-use-tbi -target-cpu cyclone -target-abi darwinpcs -sdk  Applications Xcode app Contents Developer Platforms iPhoneOS platform Developer SDKs iPhoneOS8 1 sdk -I  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Products Debug-iphoneos -F  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Products Debug-iphoneos -F  Users Alec Desktop Re-Chat Re-Chat Re-Chat -g -import-objc-header  Users Alec Desktop Re-Chat Re-Chat Re-Chat Re-Chat-Bridging-Header h -module-cache-path  Users Alec Library Developer Xcode DerivedData ModuleCache -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build swift-overrides hmap -Xcc -iquote -Xcc  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-generated-files hmap -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-own-target-headers hmap -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-all-target-headers hmap -Xcc -iquote -Xcc  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-project-headers hmap -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Products Debug-iphoneos include -Xcc -I Applications Xcode app Contents Developer Toolchains XcodeDefault xctoolchain usr include -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build DerivedSources arm64 -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build DerivedSources -Xcc -DDEBUG 1 -emit-module-doc-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController partial swiftdoc -Onone -module-name Re Chat -emit-module-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController partial swiftmodule -serialize-diagnostics-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController dia -emit-dependencies-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController d -o  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController o 0  swift                    0x0000000108145a68 llvm  sys  PrintStackTrace   sFILE     40 1  swift                    0x0000000108145f54 SignalHandler int    452 2  libsystem platform dylib 0x00007fff86631f1a  sigtramp   26 3  libsystem platform dylib 0x00007fd0ac1eb010  sigtramp   633049360 4  swift                    0x00000001075d4517 swift  Lowering  SILGenFunction  emitClosureValue swift  SILLocation  swift  SILDeclRef  llvm  ArrayRef lt swift  Substitution gt   swift  AnyFunctionRef    1303 5  swift                    0x00000001075c599e swift  Lowering  SILGenFunction  visitFuncDecl swift  FuncDecl     190 6  swift                    0x000000010760987c swift  Lowering  SILGenFunction  visitBraceStmt swift  BraceStmt     380 7  swift                    0x000000010760c8e8 swift  ASTVisitor lt swift  Lowering  SILGenFunction  void  void  void  void  void  void gt   visit swift  Stmt     152 8  swift                    0x000000010760a0a5 swift  Lowering  SILGenFunction  visitIfStmt swift  IfStmt     757 9  swift                    0x000000010760c8f6 swift  ASTVisitor lt swift  Lowering  SILGenFunction  void  void  void  void  void  void gt   visit swift  Stmt     166 10 swift                    0x00000001076097e8 swift  Lowering  SILGenFunction  visitBraceStmt swift  BraceStmt     232 11 swift                    0x000000010760c8e8 swift  ASTVisitor lt swift  Lowering  SILGenFunction  void  void  void  void  void  void gt   visit swift  Stmt     152 12 swift                    0x00000001075d52dd swift  Lowering  SILGenFunction  emitClosure swift  AbstractClosureExpr     205 13 swift                    0x00000001075b4234 swift  Lowering  SILGenModule  emitClosure swift  AbstractClosureExpr     196 14 swift                    0x00000001075eef71  anonymous namespace   RValueEmitter  visitAbstractClosureExpr swift  AbstractClosureExpr   swift  Lowering  SGFContext    97 15 swift                    0x00000001075e1866 swift  ASTVisitor lt  anonymous namespace   RValueEmitter  swift  Lowering  RValue  void  void  void  void  void  swift  Lowering  SGFContext gt   visit swift  Expr   swift  Lowering  SGFContext    2870 16 swift                    0x00000001075e24da swift  ASTVisitor lt  anonymous namespace   RValueEmitter  swift  Lowering  RValue  void  void  void  void  void  swift  Lowering  SGFContext gt   visit swift  Expr   swift  Lowering  SGFContext    6058 17 swift                    0x00000001075cfa0b swift  Lowering  SILGenFunction  emitExprInto swift  Expr   swift  Lowering  Initialization     235 18 swift                    0x00000001075ae824 swift  Lowering  RValueSource  materialize swift  Lowering  SILGenFunction amp    amp  amp    196 19 swift                    0x0000000107604a69 swift  Lowering  RValueSource  materialize swift  Lowering  SILGenFunction amp   swift  Lowering  AbstractionPattern  swift  SILType   amp  amp    233 20 swift                    0x00000001075f371c swift  Lowering  SILGenFunction  emitInjectOptionalValueInto swift  SILLocation  swift  Lowering  RValueSource amp  amp   swift  SILValue  swift  Lowering  TypeLowering const amp     268 21 swift                    0x00000001075e9b8d swift  ASTVisitor lt  anonymous namespace   RValueEmitter  swift  Lowering  RValue  void  void  void  void  void  swift  Lowering  SGFContext gt   visit swift  Expr   swift  Lowering  SGFContext    36445 22 swift                    0x00000001075e3e2b swift  ASTVisitor lt  anonymous namespace   RValueEmitter  swift  Lowering  RValue  void  void  void  void  void  swift  Lowering  SGFContext gt   visit swift  Expr   swift  Lowering  SGFContext    12539 23 swift                    0x00000001075e202b swift  ASTVisitor lt  anonymous namespace   RValueEmitter  swift  Lowering  RValue  void  void  void  void  void  swift  Lowering  SGFContext gt   visit swift  Expr   swift  Lowering  SGFContext    4859 24 swift                    0x00000001075cfab6 swift  Lowering  SILGenFunction  emitRValue swift  Expr   swift  Lowering  SGFContext    22 25 swift                    0x00000001075bffc4  anonymous namespace   ArgEmitter  emitExpanded swift  Lowering  RValueSource amp  amp   swift  Lowering  AbstractionPattern    836 26 swift                    0x00000001075bf582  anonymous namespace   ArgEmitter  emit swift  Lowering  RValueSource amp  amp   swift  Lowering  AbstractionPattern    98 27 swift                    0x00000001075b7ff8  anonymous namespace   CallEmission  apply swift  Lowering  SGFContext    1128 28 swift                    0x00000001075b751a swift  Lowering  SILGenFunction  emitApplyExpr swift  ApplyExpr   swift  Lowering  SGFContext    58 29 swift                    0x00000001075e0d81 swift  ASTVisitor lt  anonymous namespace   RValueEmitter  swift  Lowering  RValue  void  void  void  void  void  swift  Lowering  SGFContext gt   visit swift  Expr   swift  Lowering  SGFContext    81 30 swift                    0x00000001075ea00d swift  Lowering  SILGenFunction  emitIgnoredExpr swift  Expr     237 31 swift                    0x0000000107609829 swift  Lowering  SILGenFunction  visitBraceStmt swift  BraceStmt     297 32 swift                    0x000000010760c8e8 swift  ASTVisitor lt swift  Lowering  SILGenFunction  void  void  void  void  void  void gt   visit swift  Stmt     152 33 swift                    0x00000001075d4ee0 swift  Lowering  SILGenFunction  emitFunction swift  FuncDecl     256 34 swift                    0x00000001075b3659 swift  Lowering  SILGenModule  emitFunction swift  FuncDecl     233 35 swift                    0x00000001075cea93 swift  ASTVisitor lt SILGenType  void  void  void  void  void  void gt   visit swift  Decl     355 36 swift                    0x00000001075cd7eb SILGenType  emitType     203 37 swift                    0x00000001075c85ae swift  Lowering  SILGenModule  visitNominalTypeDecl swift  NominalTypeDecl     30 38 swift                    0x00000001075b555b swift  Lowering  SILGenModule  emitSourceFile swift  SourceFile   unsigned int    395 39 swift                    0x00000001075b581a swift  SILModule  constructSIL swift  Module   swift  SourceFile   swift  Optional lt unsigned int gt     314 40 swift                    0x00000001075b5968 swift  performSILGeneration swift  SourceFile amp   swift  Optional lt unsigned int gt     72 41 swift                    0x000000010748be18 frontend main llvm  ArrayRef lt char const  gt   char const   void     3432 42 swift                    0x000000010748996d main   1677 43 libdyld dylib            0x00007fff8aa4c5c9 start   1 Stack dump  0   Program arguments   Applications Xcode app Contents Developer Toolchains XcodeDefault xctoolchain usr bin swift -frontend -c -primary-file  Users Alec Desktop Re-Chat Re-Chat Re-Chat ViewController swift  Users Alec Desktop Re-Chat Re-Chat Re-Chat AppDelegate swift -target arm64-apple-ios8 0 -Xllvm -aarch64-use-tbi -target-cpu cyclone -target-abi darwinpcs -sdk  Applications Xcode app Contents Developer Platforms iPhoneOS platform Developer SDKs iPhoneOS8 1 sdk -I  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Products Debug-iphoneos -F  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Products Debug-iphoneos -F  Users Alec Desktop Re-Chat Re-Chat Re-Chat -g -import-objc-header  Users Alec Desktop Re-Chat Re-Chat Re-Chat Re-Chat-Bridging-Header h -module-cache-path  Users Alec Library Developer Xcode DerivedData ModuleCache -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build swift-overrides hmap -Xcc -iquote -Xcc  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-generated-files hmap -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-own-target-headers hmap -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-all-target-headers hmap -Xcc -iquote -Xcc  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Re-Chat-project-headers hmap -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Products Debug-iphoneos include -Xcc -I Applications Xcode app Contents Developer Toolchains XcodeDefault xctoolchain usr include -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build DerivedSources arm64 -Xcc -I Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build DerivedSources -Xcc -DDEBUG 1 -emit-module-doc-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController partial swiftdoc -Onone -module-name Re Chat -emit-module-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController partial swiftmodule -serialize-diagnostics-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController dia -emit-dependencies-path  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController d -o  Users Alec Library Developer Xcode DerivedData Re-Chat-awwdkmqavitiqkcdsphwnhzhzzfb Build Intermediates Re-Chat build Debug-iphoneos Re-Chat build Objects-normal arm64 ViewController o  1   While emitting SIL for  signIn  at  Users Alec Desktop Re-Chat Re-Chat Re-Chat ViewController swift 14 15 2   While silgen closureexpr SIL function   TFFC7Re Chat14ViewController6signInFS0 FPSs9AnyObject T U FTGSQCSo6PFUser GSQCSo7NSError  T  for expression at   Users Alec Desktop Re-Chat Re-Chat Re-Chat ViewController swift 16 80 - line 45 9  RangeText                 user  PFUser   error  NSError   - gt  Void in             if user    nil                      Do stuff after successful login                   println  Logged In                 else                    func myMethod                         var user   PFUser                       user username   username text                     user password                             other fields can be set just like with PFObject                       user signUpInBackgroundWithBlock                            succeeded  Bool   error  NSError   - gt  Void in                         if error    nil                                  Hooray  Let them use the app now                            else                                   println  Signed Up                                                                                    println  error

User · Answer

I have experienced the same issue on my first try with Realm.io. The reason for the error was that I have named my target Realm and that caused namespace clashing. The issue was resolved after I have changed my project and target name into something else, as explained on this issue.

My suggestion is to check for similar namespace clashes.

User · Answer

None of these answers worked for me but I found my issue  It had to do with Error Handling  in the Disabling Error Propagation section   I had this method   func getSlider   throws - gt  UISlider            code that could throw an error   return UISlider       Referencing it like this   func anotherMethod   - gt  Float     return try  getSlider   value     gave the error  But  when switching to this  it went away   func anotherMethod   - gt  Float     return  try  getSlider    value

User · Answer

Read the debug message carefully   in my case  I encountered this error because I used  a single     instead of double     by mistake in  if-statement   if aString characters count   2

User · Answer

I have same problem so I tried switch Optimization Level to Fast  Single-File Optimization -O  instead of Fast  Whole Module Optimization then it worked  built  archive to Appstore succeed   Some frameworks we used that need to refactor to adapt with Fast  Whole Module Optimization level I think  But I still did not find those framework

User · Answer

You can get this error when the compiler gets too confused about what s going on in your code  I noticed you have a number of what appear to be functions nested within functions  You might try commenting out some of that at a time to see if the error goes away  That way you can zero in on the problem area  You can t use breakpoints because it s a compile time error  not a run time error

User · Answer

I encountered this bug when attempting to define a new OptionSetType struct in Swift 2  When I corrected the type on the init   parameter from Self RawValue to Int the crash stopped occurring      bad      public init rawValue  Self RawValue            self rawValue   rawValue           good  public init rawValue  Int        self rawValue   rawValue

User · Answer

Easy fix if using git    1  In terminal   git stash   2  Seg fault disappears   3  Run the app   4  In terminal   git stash pop   5  Xcode now tells you the real problem

User · Answer

For me this was caused by some of my code  The detailed compiler output in XCode actually pin-pointed the method where it was crashing   I then commented out all the code in the method  made it return nil  and it did compile  I then re-implemented the method using different and much simpler code  and it worked    I filed a bug report with Apple  This is the - admittedly somewhat crazy - code that caused the crash in XCode 7   Swift 2 0     func numberAndTitleFromDirectoryName dirName  String  - gt   Int  String         let components   dirName characters split maxSplit  1  allowEmptySlices  false     0          map   String  0    map   String  0        if let number   components first  toInt             if let title   components last               return  number  title                      return nil        I guess I got a little over-excited using the map function there    The new version is a lot simpler and also more human comprehensible  Still the compiler shouldn t crash  At worst it should show some errors  The code as is worked in Swift 1 x

User · Answer

I had similar issue in with Xcode 7 3 and iOS 9 3  Command failed due to signal  Segmentation fault  11    Basic steps such as Clean  cmd shift k  code  Delete derived data and Quit Xcode didn t work   There was some culprit in my code   It was   txtUserName text characters count   0   In your case Review your code and fix the culprit

User · Answer

I also ran into this problem     obviously  it is a general error or sorts    when the xcode gets confused     in my case  I had 3 vars that I was assigning values to from an array     but I did not specify the type of data in each element of the array     once I did  it resolved the problem

User · Answer

Just note for those who might be in the same situation as I was in  since this took me so much hours to resolve     I encountered this error after I used Find Replace functionality in Xcode  The problem is that some characters are  overreplaced  due to my carelessness  i e  replace not only the relevant parts but also the redundant parts  and thus some of variables become undefined ones  Nonetheless those undefined variables weren t caught in the compile  even after making a clean  and finally the signal segmentation error was displayed on the screen

User · Answer

I had this line in my code                   weakSelf  notifications   weakSelf  notifications         weakSelf  chatNotificationDataSource         this cause Segmentation fault  But then i changed it in this way   weakSelf  notifications    weakSelf  notifications           weakSelf  chatNotificationDataSource          and app started working

User · Answer

For me I was blocking the main thread   What I did to Fix it with GCD  see below   dispatch async dispatch get main queue

User · Answer

One of case  is that you have named datatype of getter variable like its name  For example   var someInstance  someInstance          Update  1  Keep attention on  a variable which isn t Int  and you forget to point right return type  Issue happens in more than two operands of infix operator   function getInt value  Int  - gt  Int       return  a      b  count    0

User · Answer

I had that code 11 when trying to build for release scheme  It pointed out one viewcontroller class  swift  that had this piece of code inside    required init coder aDecoder  NSCoder        super init coder  aDecoder      stuff        The problem was that when I have added superclass to it  I forgot to also implement init  So that super init caused compiler error Segmentation fault  11 So if you have such problem it s good idea to check also any superclasses

User · Answer

Named tuples in array in a let property gave me the seg fault issue

User · Answer

I actually screwed up Core Data entities a bit while porting from Swift 2 0 to 1 2  don t ask why  I deleted all the entity classes and recreated them again  I got lots of error messages then and when I fixed them all the project built successfully

User · Answer

In my case  IGListKit refactored their class named IGListSectionController to ListSectionController   while I already had a class named ListSectionController  I used find and replace and didn t know I had a class with the same name   class ListSectionController   ListSectionController  I read the error message in full and concluded that this error can also happen when you have Circular dependencies  This wasn t mentioned in any of the comments  I hope this helps

User · Answer

I hit this error  After some frustration I tried Xcode clean and everything started working again  Just leaving this here for future reference

User · Answer

Any crash is a compiler bug  whether or not your code is valid   Try the latest beta and if it still crashes file a bug report at bugs swift org  The Swift team are very responsive on these

User · Answer

I had exactly the same issue  and after many hours of debugging  I found out it was because I was accessing a subscript by using  subscript   instead of between     XCode thinks this is perfectly valid  but gives this segmentation fault error when building

User · Answer

I got this error when I was overriding a property in a subclass and I didn t repeat the property s declaration exactly    Base class    var foo  String   return nil   Subclass    override var foo  String  return  bar      missing the implicit unwrap operator

User · Answer

object doubleValue   dict  doublevalue   as  Int   I found the reason after rolling back each step I made     force casting to Int for a Double variable

User · Answer

In my case it was caused by trying to use a function that returned an NSNumber as an argument where a Double was expected   My advice is be careful mixing Objective C objects with Swift datatypes   And as many others have suggested  comment out lines until you pinpoint which one causes the error    Even if you create other errors when doing so  you can just ignore them and see what makes the segmentation fault error go away

User · Answer

In my case  I had several instances of methods taking a closure with a signature like this  notice the optional array of dictionaries        results  being nil means  failure   func queryItems      completion    results   String AnyObject    - gt  Void                   async operation          which I started to refactor into       results  is NEVER nil  at most  empty   Pass any errors to the       failure  closure instead  func queryItems      success    results   String AnyObject   - gt  Void         failure    error NSError  - gt   Void                   async operation          but did not finish  so some methods expected a closure with an optional argument and where being passed a non-optional one  or viceversa    and I guess the compiler lost track

User · Answer

In my case this happened in Xcode 11 beta 3 with Swift 5 and using SwiftUI   My View has a  State property like this     State private var normInfo  NormInfo    the issue got solved by explicitly initializing it with nil

User · Answer

For me  this was caused by a change in the Parse SDK syntax in Swift 2 0  If you are using Parse and you upgrade to Swift 2 0  the following syntax changes   Swift 1 2   myPFQuery findObjectsInBackgroundWithBlock    queryResults   AnyObject    error  NSError   - gt  Void in         CODE       Swift 2 0   myPFQuery findObjectsInBackgroundWithBlock    queryResults   PFObject    error  NSError   - gt  Void in         CODE      The removal of the first     and the last     is what was causing the biggest problem  Took me AGES to find this

User · Answer

There would be a filename mentioned after Command failed due to signal  Segmentation fault  11   Atleast in my case it was  With Swift upgrade to 2 0 some of the core properties were changes to optional  On not handling it appropriately it threw that error  Handling the optional well dismissed the error  In my case it was due to not handling            if let scheduledNotifications   UIApplication sharedApplication   scheduledLocalNotifications as  UILocalNotification          Good Luck

User · Answer

I got this error when getting a value from NSUserDefaults  The following gives error   let arr   defaults objectForKey  myArray     What fixed the error was to cast the type to the correct type stored in NSUserDefaults  The following gives no error   let arr   defaults objectForKey  myArray   as  Array lt String gt

User · Answer

I m using Xcode 8 3 Swift 3  I used  Ron B  s answer to go through all the code and comment out different functions until I got a successful build  It turns out it was async trailing closures that was causing my error   My trailing closures   let firstTask   DispatchWorkItem         self doSomthing     let secondTask   DispatchWorkItem         self doSomthingElse        trailing closure  1 DispatchQueue main asyncAfter deadline   now     10  firstTask     trailing closure  2  DispatchQueue main asyncAfter deadline   now     20  secondTask    Once I used the autocomplete syntax the Segmentation fault  11  was Gone    autocomplete syntax closure  1 DispatchQueue main asyncAfter deadline   now     10  execute  firstTask     autocomplete syntax closure  2 DispatchQueue main asyncAfter deadline   now     20  execute  secondTask

User · Answer

I also had the Segmentation Fault 11  when importing a framework made by myself  yeah  felt really dumb    After developing the framework for months and integrating it into a main project with intermixed Obj-C and Swift  importing to Obj-C was a no-problem  but as soon as I wrote the import MySwiftProject in Swift  all hell broke loose   Long story short  the problem was that I created some custom methods that provide typification for NSNotifications using closures  for example   func post a   Int  b   String        NSNotificationCenter defaultCenter   postNotification  notification   object  nil  userInfo    a    a   b    b      func observe block    a   Int  b   String  - gt      - gt  NSObjectProtocol       return  NSNotificationCenter defaultCenter   addObserverForName  notification   object  nil  queue  nil                 n   NSNotification   - gt     in             Unwrap the notification payload and provide types         if let a   n userInfo   a   as  Int  let b   n userInfo   b   as  String                       block a  b                       Actually  the code above I did with a template  but that s another story   The main culprit  This   func     - gt  NSObjectProtocol   Apparently  Apple can use NSObjectProtocol in the declaration of NSNotification s methods  but when I do  it introduces a Segfault 11  Replacing NSObjectProtocol to AnyObject solved the crash   Unfortunately  this might not solve your issue  since segfault 11 is simply a generic crash of the compiler  but you can take steps to solve it  It took me around 2 hours  but this is what I did    Create a new project  replicating the structure you had  In my case  I created a single view controller swift project  and added a swift framework inside as another project  Copy all the original code from one to another  Go to the compilation phase  and start removing files to compile  try disabling pieces of code that are very swift-hacky  like my NSNotification typification   Every time you do a change  do a clean        K   build    B  and fix any errors  Repeat from 3 until the segmentation fault goes away

User · Answer

When your development target is not supporting any UIControl  In my case i was using StackView in a project with development target 8 0  This error can happen if your development target is not supporting any UIControl   When you set incorrect target  In below line if you leave default target  target  instead of self then Segmentation fault 11 occurs   shareBtn addTarget self  action   selector ViewController share       for   touchUpInside

User · Answer

I recently encountered the same problem  and I will try to generalise how I solved it  as a lot of these answers are to spesific to be of help to everyone   1  First look at the bottom of the error message to identify the file and function which causes the segmentation fault     2  Then I look at that function and commented out all of it  I compiled and it now worked  Then I removed the comments from parts of the function at a time  until I hit the line that was responsible for the error  After this I was able to fix it  and it all works

User · Answer

In my case  I forgot to remove a  colorLiteral   which is not assigning to any property or not passing as a method parameter  in my source code that s why the compiler was not able to compile all swift files  I just removed the  colorLiteral  and its working fine as expected

User · Answer

Found this to happen when using ternary statements in a WKInterfaceController  ie Watch app

User · Answer

In my case the reason was having a class declared within another class within an extension   extension classOrig       class classChild           class classGrandChild               static let aVariable   String    SomeValue                       This generated the error on my side  I had several frameworks in my project  yet it did not happen before

User · Answer

its a simple solution  Just Press cmd shift k  my problem is solved for clean the project

User · Answer

I also struggled with this for a while  I upgraded my code to Swift 2 with Xcode 7 2 and for me the problem was this    self mainScrollView documentView  subviews reverse   as   MainSubView    Which I had to change to    self mainScrollView documentView  subviews as   MainSubView   reverse

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When I got this error converting from Swift to Swift 2 0  it clearly indicates a particular file  blahClass swift  that has the problem  then it outlined all of the warnings  amp  errors in the error message text  I went through and resolved these manually and now the app compiles fine

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For me this popped up when I accidentally called  super init    inside a completionHandler of a method that was called from the class init method   init                     someFunction argument  completionHandler     data  - gt     in             super init           instead of   init                 super init           someFunction argument  completionHandler     data  - gt     in

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I also encounterd the Segmentation fault  11 error because I was calling a method which was returning Any object and compiler got confused to understand the object type that was being used    Casting Any object to the required type which I was using  solved my issue

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If you re using multiple versions of XCode  this error can easily happen if your paths have changed  eg  You downloaded the DMG to Desktop  extracted  but then moved XCode to Applications afterward   Carefully read the Segmentation Fault 11 error given to you in XCode  it may reference your old path which is the cause of the Segmentation Fault  If it does  you can fix it by either    xcode-select the correct path  Eg  sudo xcode-select -s  Applications Xcode-beta app Contents Developer   obviously input your correct path here  When installing your second version of XCode  ensure it s being extracted to the final path  extract to Applications itself  and that  XCode app  doesn t already exist when you do so  rename your previous one if it exists   After it s installed  you can rename both as you like     Another potential fix for this issue   Upgrading from El Capitan to Sierra and  installing extra components  when launching Xcode after this upgrade fixed it for me the first time this happened

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This happened to me when there were some nested functions in my code and one of the nested function was calling another nested function   I just removed the chaining between the nested functions and this issue was fixed   thanks to  Ron B s answer

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In my case Product Clean and then restarting Xcode did resolve this problem

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For me it s because I have two bundles with the same name

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For anyone else coming across this    I found the issue was caused by importing a custom framework  I have no idea how to correct it  But simply removing the import and any code referencing items from the framework fixes the issue                    Hope this can save someone a few hours chasing down which line is causing the issue

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I got rid of this error by following   I had many frameworks added in  Link Binary With Libraries  and was using a bridging header as well   I re-added all the frameworks and added the bridging header again  This solved my issue

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I got this error when I was trying to access a property of a singleton s struct instance from a  static scope  within that singleton  that contains constants inside an enum that are never instantiated

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Human Error report  In my case  the culprit was passing in an array in the place of a variadic parameter  That is  for the signature     Note the variadic parameter func addSubview subview subview  UIView  constrain  NSLayoutAttribute      I passed in     Compile-time error   quot constrain quot  parameters have array brackets someUIView addSubview subview  someOtherView  constrain    Leading   Top   Bottom   Trailing    rather than     Correct someUIView addSubview subview  someOtherView  constrain   Leading   Top   Bottom   Trailing

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In my case I had declared the following property in one of my ViewControllers subclass     property NSString   title   I think this was conflicting with the already existing title property in ViewController  I renamed this property to something else and refactored its use and the error disappeared

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In my case  I was trying to extend a CoreData class with a helper method that could work on all of its subclasses   extension ExampleCoreDataClass      static func insert   - gt  Self            I got no warnings about this  but when I tried to compile it the segmentation fault appeared    After struggling for a while I used a protocol extension instead and this resolved the error   extension NSFetchRequestResult where Self  ExampleCoreDataClass      static func insert   - gt  Self

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I got segmentation fault on my Mac Mini using Xcode Bots  The seg fault did only occur during build step of testing and not during building or running locally  Only in Xcode bots during build step of testing   I am using macOS Sierra and Xcode 8  with the code converted to Swift 2 3   I finally found the line causing the seg fault  it was caused by   public let isIpad   UIDevice currentDevice   userInterfaceIdiom     Pad   Which was declared outside a class as a constant  Changing it to check the userInterfaceIdiom at runtime fixed the issue   Hopes this helps someone else   This is the error log for my seg fault   0  swift                    0x000000010f93d76b llvm  sys  PrintStackTrace llvm  raw ostream amp     43 1  swift                    0x000000010f93ca56 llvm  sys  RunSignalHandlers     70 2  swift                    0x000000010f93ddbf SignalHandler int    287 3  libsystem platform dylib 0x00007fffb24aabba  sigtramp   26 4  libsystem platform dylib 0x00007fbbfff49ae0  sigtramp   1302982464 5  swift                    0x000000010db79996  anonymous namespace   Traversal  visit swift  Expr     118 6  swift                    0x000000010db7b880  anonymous namespace   Traversal  visitApplyExpr swift  ApplyExpr     128 7  swift                    0x000000010db799eb  anonymous namespace   Traversal  visit swift  Expr     203 8  swift                    0x000000010db78f45 swift  Expr  walk swift  ASTWalker amp     53 9  swift                    0x000000010d6d2c87 walkForProfiling swift  AbstractFunctionDecl   swift  ASTWalker amp     231 10 swift                    0x000000010d6d2719 swift  Lowering  SILGenProfiling  assignRegionCounters swift  AbstractFunctionDecl     553 11 swift                    0x000000010d6de348  anonymous namespace   SILGenType  emitType     952 12 swift                    0x000000010d6ddf1e swift  Lowering  SILGenModule  visitNominalTypeDecl swift  NominalTypeDecl     30 13 swift                    0x000000010d6625eb swift  Lowering  SILGenModule  emitSourceFile swift  SourceFile   unsigned int    731 14 swift                    0x000000010d663139 swift  SILModule  constructSIL swift  ModuleDecl   swift  SILOptions amp   swift  FileUnit   llvm  Optional lt unsigned int gt   bool  bool    793 15 swift                    0x000000010d6635a3 swift  performSILGeneration swift  FileUnit amp   swift  SILOptions amp   llvm  Optional lt unsigned int gt   bool    115 16 swift                    0x000000010d491c18 performCompile swift  CompilerInstance amp   swift  CompilerInvocation amp   llvm  ArrayRef lt char const  gt   int amp     12536 17 swift                    0x000000010d48dc79 frontend main llvm  ArrayRef lt char const  gt   char const   void     2777 18 swift                    0x000000010d489765 main   1957 19 libdyld dylib            0x00007fffb229e255 start   1

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I came across this error in a CI build and I couldn t reproduce it locally  Turns out I was using a different version of Xcode that what my CI was using

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I just had this issue and found that it was because I had accidentally left an override on a function that I d moved from the class to a protocol  therefore the subclass was no longer overriding a function of the parent

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I ran into this while building for Tests  Build to Run works fine  Xcode 7 Swift 2 didn t like the way a variable was initialized  This code ran fine in Xcode 6 4  Here s the line that caused the seg fault   var lineWidth  CGFloat    UIScreen mainScreen   scale    1 0    1 0   0 5   Changing it to this solved the problem   var lineWidth  CGFloat       return  UIScreen mainScreen   scale    1 0    1 0   0 5

[ios] Command failed due to signal: Segmentation fault: 11

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