# Issues building latest master for Xcode development

**URL:** <https://forums.swift.org/t/issues-building-latest-master-for-xcode-development/13451>\
**Category:** Compiler\
**Created:** [June 8, 2018, 8:59pm UTC](https://forums.swift.org/t/issues-building-latest-master-for-xcode-development/13451 "2018-06-08T20:59:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![monocularvision](https://sea2.discourse-cdn.com/swift/user_avatar/forums.swift.org/monocularvision/32/1411_2.png) [@monocularvision](https://forums.swift.org/u/monocularvision)\
**Post date:** [June 8, 2018, 8:59pm UTC](https://forums.swift.org/t/issues-building-latest-master-for-xcode-development/13451/1 "2018-06-08T20:59:08Z")

</div>

I hope this is an appropriate place to ask for help with this. If not, please let me know if there is a better place! I was looking to dive into some Swift compiler development and I've immediately hit a brick wall with the latest build.

I've pulled down `master` (I'm currently on commit `6f94f6c0ef4`), followed the directions from the `README.md`:

1. Used `homebrew` to install dependencies: `cmake` and `ninja`
2. Downloaded/installed Xcode 10 beta and made sure it is selected with `xcode-select`. Output of `xcodebuild -version` is `Xcode 10.0 Build version 10L176w`
3. Created a `swift-source` directory to place the code in
4. Cloned Swift and ran the script to pull down other projects `git clone git@github.com:apple/swift.git` & `./swift/utils/update-checkout --clone-with-ssh`.
5. Ran `utils/build-script --debug --xcode` to make a debug build I can run with Xcode.

Whenever running step 4 above, I end up getting:

```swift
The following build commands failed:
	CompileC /Users/mcmcguir/github/swift-source/build/Xcode-DebugAssert/swift-macosx-x86_64/stdlib/public/stubs/Swift.build/Debug/swiftStdlibStubs-macosx-x86_64.build/Objects-normal/x86_64/SwiftNativeNSXXXBase.o /Users/mcmcguir/github/swift-source/build/Xcode-DebugAssert/swift-macosx-x86_64/stdlib/public/stubs/8/SwiftNativeNSXXXBase.mm normal x86_64 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)
utils/build-script: fatal error: command terminated with a non-zero exit status 65, aborting

```

This is the error I'm seeing:

```swift
error: Build input file cannot be found: '/Users/mcmcguir/github/swift-source/build/Xcode-DebugAssert/swift-macosx-x86_64/stdlib/public/stubs/8/SwiftNativeNSXXXBase.mm'

```

If I copy the entire command and run it, it seems to execute just fine. I see the file present in that location. If I just run `utils/build-script --debug` it seems to finish ok.

Any ideas?

Thanks!