Something odd after upgrading to swiftc 6.0

Using Swift
1

I updated Xcode and I had to agree to the new terms of service to complete the upgrade from Swift 5.10 to 6.0.
Then this happened:

% swiftc a.swift
clang: error: no such file or directory: '35758'
clang: error: no input files
% swiftc --version
swift-driver version: 1.115 Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx14.0

I tried compiling again and it worked fine, but what is or was this mysterious 35758 directory? And why would an input file be deemed "no input files"?

2

Well, that’s weird. I’m not seeing this myself:

% xcode-select -p
/Applications/Xcode.app/Contents/Developer
% swiftc --version
swift-driver version: 1.115 Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx14.0
% cat a.swift 
func main() {
    print("Hello Cruel World!")
}

main()
% swiftc a.swift
% ./a
Hello Cruel World!

I’m running the Swift 6 from Xcode 16.0 on macOS 14.6.1.

I’ve seen weird issues like this caused by the environmental setup. I recommend that you create a new user account (in System Settings > Users & Groups) and run the above test from there. That’ll tell you whether this is tied to the state in your home directory or not.

Share and Enjoy

Quinn “The Eskimo!” @ DTS @ Apple

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3

OK I created a new account. I don't see the issue when compiling in that one.

4

I don't see the issue when compiling in that one.

Cool. That confirms that there’s something in your home directory that’s ‘breaking’ your developer tools. That’s kinda vague, but it’s a start.

As a next step, I recommend that you temporarily disable all the startup scripts for your shell. If you’re using macOS’s default zsh shell, that means:

  • ~/.zshenv
  • ~/.zprofile
  • ~/.zshrc
  • ~/.zlogin
  • ~/.zlogout

That’ll tell you whether a custom shell configuration option is causing the issue. For example, in one case I saw on DevForums the developer had set an environment variable that was causing an issue reminiscent of this.

Share and Enjoy

Quinn “The Eskimo!” @ DTS @ Apple

1 Like