Command failed due to signal: Segmentation fault: 11
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Command failed due to signal: Segmentation fault: 11
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!) -> 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!) -> 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, 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::visit(swift::Stmt*) + 152 8 swift 0x000000010760a0a5 swift::Lowering::SILGenFunction::visitIfStmt(swift::IfStmt*) + 757 9 swift 0x000000010760c8f6 swift::ASTVisitor::visit(swift::Stmt*) + 166 10 swift 0x00000001076097e8 swift::Lowering::SILGenFunction::visitBraceStmt(swift::BraceStmt*) + 232 11 swift 0x000000010760c8e8 swift::ASTVisitor::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<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::visit(swift::Expr*, swift::Lowering::SGFContext) + 2870 16 swift 0x00000001075e24da swift::ASTVisitor<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::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&) && + 196 19 swift 0x0000000107604a69 swift::Lowering::RValueSource::materialize(swift::Lowering::SILGenFunction&, swift::Lowering::AbstractionPattern, swift::SILType) && + 233 20 swift 0x00000001075f371c swift::Lowering::SILGenFunction::emitInjectOptionalValueInto(swift::SILLocation, swift::Lowering::RValueSource&&, swift::SILValue, swift::Lowering::TypeLowering const&) + 268 21 swift 0x00000001075e9b8d swift::ASTVisitor<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::visit(swift::Expr*, swift::Lowering::SGFContext) + 36445 22 swift 0x00000001075e3e2b swift::ASTVisitor<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::visit(swift::Expr*, swift::Lowering::SGFContext) + 12539 23 swift 0x00000001075e202b swift::ASTVisitor<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::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&&, swift::Lowering::AbstractionPattern) + 836 26 swift 0x00000001075bf582 (anonymous namespace)::ArgEmitter::emit(swift::Lowering::RValueSource&&, 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<(anonymous namespace)::RValueEmitter, swift::Lowering::RValue, void, void, void, void, void, swift::Lowering::SGFContext>::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::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::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) + 314 40 swift 0x00000001075b5968 swift::performSILGeneration(swift::SourceFile&, swift::Optional) + 72 41 swift 0x000000010748be18 frontend_main(llvm::ArrayRef, 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 Answer by Ron B. for Command failed due to signal: Segmentation fault: 11
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.
Answer by dimpiax for Command failed due to signal: Segmentation fault: 11
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) -> Int { return _a? ?? _b?.count ?? 0 } Answer by Joseph Lord for Command failed due to signal: Segmentation fault: 11
Any crash is a compiler bug (whether or not your code is valid). Try the latest beta and if it still crashes file a radar with Apple. The Swift team are very responsive on these.
Answer by Vakas for Command failed due to signal: Segmentation fault: 11
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.
Answer by Yaroslav for Command failed due to signal: Segmentation fault: 11
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.
Answer by gogel for Command failed due to signal: Segmentation fault: 11
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.
Answer by Chris Wagner for Command failed due to signal: Segmentation fault: 11
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.
Answer by Can for Command failed due to signal: Segmentation fault: 11
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) -> ()) -> NSObjectProtocol { return NSNotificationCenter.defaultCenter().addObserverForName("notification", object: nil, queue: nil) { (n : NSNotification!) -> () 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 ... -> 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.
Answer by William T. for Command failed due to signal: Segmentation fault: 11
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 & errors in the error message text. I went through and resolved these manually and now the app compiles fine.
Answer by n13 for Command failed due to signal: Segmentation fault: 11
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) -> (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
Answer by AT3D for Command failed due to signal: Segmentation fault: 11
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?) -> Void in // CODE }) Swift 2.0:
myPFQuery.findObjectsInBackgroundWithBlock { (queryResults: [PFObject]?, error: NSError?) -> Void in // CODE } The removal of the first '(' and the last ')' is what was causing the biggest problem. Took me AGES to find this!
Answer by Blaszard for Command failed due to signal: Segmentation fault: 11
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.
Answer by Ankish Jain for Command failed due to signal: Segmentation fault: 11
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!
Answer by Victor Zimmer for Command failed due to signal: Segmentation fault: 11
I hit this error. After some frustration I tried Xcode clean and everything started working again. Just leaving this here for future reference.
Answer by Justin Vallely for Command failed due to signal: Segmentation fault: 11
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 } Answer by Alex Germn for Command failed due to signal: Segmentation fault: 11
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.
Answer by Michael Baisch for Command failed due to signal: Segmentation fault: 11
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() Answer by Justin Milo for Command failed due to signal: Segmentation fault: 11
Named tuples in array in a let property gave me the seg fault issue.
Answer by thesummersign for Command failed due to signal: Segmentation fault: 11
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.
Answer by Ben Reimers for Command failed due to signal: Segmentation fault: 11
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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