Carthage: DVTToolchain: Failed to load toolchain

[TofPlay]

• carthage version: 0.16.2
• xcodebuild -version: Xcode 7.3.1 Build version 7D1014
• Are you using --no-build? No
• Are you using --no-use-binaries? No
• Are you using --use-submodules? No

Cartfile

github "PureLayout/PureLayout" == 3.0.1

Carthage Output

$ carthage update --platform iOS
*** Fetching PureLayout
*** Checking out PureLayout at "v3.0.1"
*** xcodebuild output can be found in /var/folders/rw/gbr9wvs91cz91mcpgdxv4q340000gn/T/carthage-xcodebuild.MK8m9m.log
*** Building scheme "PureLayout_iOS" in PureLayout.xcodeproj
2016-06-17 16:56:15.243 xcodebuild[18717:2053856] [MT] DVTToolchain: Failed to load toolchain: <DVTFilePath:0x7fb49d003260:'/Library/Developer/Toolchains/swift-latest.xctoolchain'>: Error Domain=DVTToolchainErrorDomain Code=4 "alleged toolchain directory doesn't contain ToolchainInfo.plist or Info.plist" UserInfo={NSFilePath=/Library/Developer/Toolchains/swift-latest.xctoolchain, NSLocalizedDescription=alleged toolchain directory doesn't contain ToolchainInfo.plist or Info.plist}
2016-06-17 16:56:18.387 xcodebuild[18788:2054057] [MT] DVTToolchain: Failed to load toolchain: <DVTFilePath:0x7fa3d6300940:'/Library/Developer/Toolchains/swift-latest.xctoolchain'>: Error Domain=DVTToolchainErrorDomain Code=4 "alleged toolchain directory doesn't contain ToolchainInfo.plist or Info.plist" UserInfo={NSFilePath=/Library/Developer/Toolchains/swift-latest.xctoolchain, NSLocalizedDescription=alleged toolchain directory doesn't contain ToolchainInfo.plist or Info.plist}

Just for information: I installed Xcode 8 Beta in the same Mac

Does anyone have an idea to fix this error? I feel that installing Xcode 8 created this problem. With time we will probably be required to have multiple versions of the tool chaine on a same mac. I don't know if Carthage is ready to manage this case.

Update: All my projects using Carthage have this error 😰

[TofPlay]

When I check the log the build of "PureLayout" finished with ** BUILD SUCCEEDED **
xcodebuild generate the error DVTToolchain: Failed to load toolchain but the build is done successfully 😳

[mdiep]

I'm not sure. You might want to try reinstall Xcode. 😕

[TofPlay]

You might want to try reinstall Xcode. 😕

Xcode 7 or Xcode 8 Beta?

[mdiep]

Both? 😕

[Baza207]

I'm seeing this with --use-submodules on update as well, using the same build of Carthage.

@TofPlay Did you try reinstalling Xcode, and if so did it help?

[dmcrodrigues]

I was able to fix this issue by removing each toolchain that I had installed before Xcode 8 and then removing (manually) the symbolic link for the latest toolchain, /Library/Developer/Toolchains/swift-latest.xctoolchain. Without removing the symbolic link I was still observing the same error.

Meanwhile I installed a more recent toolchain (master) and everything seems continuing to be working.

[TofPlay]

@Baza207 I reinstall Xcode 8 but it doesn't change anything
I checked on /Library/Developer/Toolchains and here's what I had:

$ cd /Library/Developer/Toolchains/
$ ll
total 8
lrwxr-xr-x  1 root  wheel    83B Jun  1 08:10 swift-latest.xctoolchain -> /Library/Developer/Toolchains/swift-3.0-preview-1-SNAPSHOT-2016-05-31-a.xctoolchain

Like @dmcrodrigues I have a swift-latest.xctoolchain that points to a directory that no longer exists. Remove this link solves the problem. (thanks to David Rodrigues 👍 🙂 )

[TofPlay]

@mdiep just some quick questions: If I have a project develop with Swift 3 but this project need some frameworks written in Swift 2.3 and others written in Swift 3 how Carthage know what tool chain it must take for each framework? Or more simple I install a new tool chain and I want to test if my Carthage framework is compatible with this tool chain. How I can do that? Can we specify the tool chain in a Cartfile?

[Baza207]

Thanks @TofPlay, same thing here and removing that sys link seems to have fixed it.

Seems to be a remnant of manually installing a Swift snapshot, rather than waiting for the Xcode 8 beta. 😛 When deleting the toolchain in Xcode 7, it doesn't seem to remove the sys link.

I'm not sure where we should report this, should it be a Radar or a Swift issue on JIRA?

[mdiep]

If I have a project develop with Swift 3 but this project need some frameworks written in Swift 2.3 and others written in Swift 3 how Carthage know what tool chain it must take for each framework?

I'm not sure that's supported by Swift/Xcode.

Or more simple I install a new tool chain and I want to test if my Carthage framework is compatible with this tool chain. How I can do that? Can we specify the tool chain in a Cartfile?

TOOLCHAINS=com.apple.dt.toolchain.Swift_2_3 carthage build

[TofPlay]

Hi @mdiep

I'm not sure that's supported by Swift/Xcode.

Me either I don't know. But for sure all frameworks used on our projects will not migrate to Swift 3 simultaneously. The question is: Do we have to wait until all frameworks have switched to Swift 3 before migrate our project on Swift 3 too?

TOOLCHAINS=com.apple.dt.toolchain.Swift_2_3 carthage build

Ok thanks :)

[Baza207]

@mdiep @TofPlay

If I have a project develop with Swift 3 but this project need some frameworks written in Swift 2.3 and others written in Swift 3 how Carthage know what tool chain it must take for each framework?

I'm not sure that's supported by Swift/Xcode.

I have a feeling that's not supported at the moment, but will be in the future, when the ABI is brought out after Swift 3 (though don't quote me, I may have completely misunderstood that).

[ikesyo]

IIUC we can't link a framework built with Swift 2.3 to Swift 3 codes and vice versa since there is no binary comparibility (ABI stability) yet.

[mdiep]

It sounds like the underlying issue here was resolved.

[Chandlerdea]

@dmcrodrigues I am seeing this issue, how did you remove the system link to the old toolchains?