title: Command failed due to signal: Segmentation fault: 11
body: <p>I'm getting the error ...</p>
  
  <blockquote>
    <p>Command failed due to signal: Segmentation fault: 11</p>
  </blockquote>
  
  <p>... when trying to compile my Swift app. I'm using Xcode 6.1, trying to build for an iPhone 5 on iOS 8.1.</p>
  
  <p><strong>My Code</strong></p>
  
  <pre><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.
      }
  }
  </code></pre>
  
  <p><strong>And the error text!</strong></p>
  
  <pre><code>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")
              }
          }"
  </code></pre>