title: Unable to execute command: killed 9 in Xcode 9.3
body: <p>I have a unity project that i'm building for iOS. I've included EasyAR, OneSignal, Firebase Analytics in the project. </p>
  
  <p>It is working fine on Android without ant hiccups. </p>
  
  <p>But on iOS I get this error in Xcode:</p>
  
  <blockquote>
    <p>clang: error: unable to execute command: Killed: 9
    clang: error: clang frontend command failed due to signal (use -v to see invocation)
    Apple LLVM version 9.1.0 (clang-902.0.39.1)
    Target: aarch64-apple-darwin17.5.0
    Thread model: posix
    InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
    clang: note: diagnostic msg: PLEASE submit a bug report to <a href="http://developer.apple.com/bugreporter/" rel="nofollow noreferrer">http://developer.apple.com/bugreporter/</a> and include the crash backtrace, preprocessed source, and associated run script.
    clang: note: diagnostic msg: 
    PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
    Preprocessed source(s) and associated run script(s) are located at:
    clang: note: diagnostic msg: /var/folders/fq/1sb3yqqx5s75s2h8m5z56fwm0000gn/T/Bulk_Assembly-CSharp_7-05e3fe.cpp
    clang: note: diagnostic msg: /var/folders/fq/1sb3yqqx5s75s2h8m5z56fwm0000gn/T/Bulk_Assembly-CSharp_7-05e3fe.sh
    clang: note: diagnostic msg: Crash backtrace is located in
    clang: note: diagnostic msg: /Users/amit/Library/Logs/DiagnosticReports/clang__.crash
    clang: note: diagnostic msg: (choose the .crash file that corresponds to your crash)
    clang: note: diagnostic msg: </p>
  </blockquote>
  
  <hr>
  
  <p>Unity version: 2017.3
  Xcode: 9.3</p>