Support Xcode 26 · MobiVM/robovm · Discussion #832

hennadiib
Jan 18, 2026

Hello Community,

I face the issue Xcode 26 is not supported now.
Can you confirm my understanding, please?

I try to build iOS version mobile game based on the LibGDX engine and fail.
Maybe some alternatives exist. I can not downgrade Xcode as my OS do not support older. (I am with Tahoe)

Main problem with LaunchScreen.storyboard.
I can disable it, but then my game is cut top and bottom with black rows.

For now, started "hard" way - installing virtual macOS to install older Xcode, but that can not be long term working solution.

Thanks in advance for your comments.

Answered by dkimitsa

Jan 19, 2026

21A342", "21C62" seems to be related to ios17 runtime.

I would go to Xcode-Settings-Components and check what iOS simulators you have there.
probably iOS17 are broken one.

the option would be to delete all not required/broken (or all).
and re-install if you need anything other than iOS 26

View full answer

Replies: 3 comments 10 replies

dkimitsa
Jan 18, 2026
Maintainer

hello @hennadiib ,

can you please provide more details, like error message stack trace etc.
why do you think it is an issue with Xcode 26 ?

thx.

0 replies

hennadiib
Jan 18, 2026
Author

Sure, my setup:
OS: Tahoe
Xcode: 26.2
RoboVMVersion: 2.3.20

After a good few days of debuggin it, I realised my build on the simulator is successful once I remove the file LaunchScreen.storyboard and lines in Info.plist.xml <key>UILaunchStoryboardName</key>. I checked in few sources, and output was - RoboVM not compatible with Xcode 26.

What I do:

Termanal ./gradlew ios:launchIPhoneSimulator

> Task :ios:launchIPhoneSimulator FAILED
[Incubating] Problems report is available at: file:///pathtoproject/projects/games/capitosh-game/build/reports/problems/problems-report.html
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':ios:launchIPhoneSimulator'.
> Failed to launch simulator
 Command '[/Applications/Xcode.app/Contents/Developer/usr/bin/ibtool, --target-device, iphone, --target-device, ipad, --minimum-deployment-target, 11.0, --output-partial-info-plist, /Users/h9842/projects/games/capitosh-game/ios/build/robovm.tmp/partial-plists/LaunchScreen.storyboard_10836611712646846764.plist, --auto-activate-custom-fonts, --output-format, human-readable-text, --compilation-directory, pathtoproject/projects/games/capitosh-game/ios/build/robovm.tmp/IOSLauncher.app/Base.lproj, pathtoproject/projects/games/capitosh-game/ios/data/Base.lproj/LaunchScreen.storyboard]' failed (Exit value: 1)

Run from Android Studio with the plugin.

[ERROR] Couldn't compile app
org.apache.commons.exec.ExecuteException: Command '[/Applications/Xcode.app/Contents/Developer/usr/bin/ibtool, --target-device, iphone, --target-device, ipad, --minimum-deployment-target, 11.0, --output-partial-info-plist, /Users/h9842/projects/games/capitosh-game/ios/robovm-build/tmp/iOS Run/ios/arm64-simulator/partial-plists/LaunchScreen.storyboard_7881940593718596925.plist, --auto-activate-custom-fonts, --output-format, human-readable-text, --compilation-directory, /Users/h9842/projects/games/capitosh-game/ios/robovm-build/tmp/iOS Run/ios/arm64-simulator/IOSLauncher.app/Base.lproj, /Users/h9842/projects/games/capitosh-game/ios/data/Base.lproj/LaunchScreen.storyboard]' failed (Exit value: 1)
	at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404)
	at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
	at org.robovm.compiler.util.Executor.exec(Executor.java:344)
	at org.robovm.compiler.util.ToolchainUtil.ibtool(ToolchainUtil.java:359)
	at org.robovm.compiler.target.ios.IOSTarget5ドル.processFile(IOSTarget.java:960)
	at org.robovm.compiler.config.Resource.walk(Resource.java:447)
	at org.robovm.compiler.config.Resource.walk(Resource.java:454)
	at org.robovm.compiler.config.Resource.walk(Resource.java:434)

Internet and ChatGPT say - it is about compatibility of new Xcode and your product. ...Maybe I am wrong... Hope I am wrong :)

1 reply

@dkimitsa

dkimitsa Jan 18, 2026
Maintainer

thx for detail,
sadly can't see any error output from ibtool in your log.

meanwhile have tested and seems to be working for me:

used gdx-liftoff-1.14.0.3.jar to generate simple iOS project;
started it with ./gradlew --info launchIPhoneSimulator

I assume it might be related with you storyboard file.

could you please try on sample projects (with steps above) ?
also if it possible please share sample project that reproduce the issue.

Thx !

hennadiib
Jan 19, 2026
Author

Hello @dkimitsa ,
Here is an initial LibGDX project without any changes. https://github.com/hennadiib/reproduce-issue-libgdx-romovm
To run it on android - simply connect device and start in Android Studio...
To run on iOS I create a configuration with RoboVM in Android Studio, start the iOS simulator, and run...
It fails with the error below...

[ERROR] Couldn't compile app
org.apache.commons.exec.ExecuteException: Command '[/Applications/Xcode.app/Contents/Developer/usr/bin/ibtool, --target-device, iphone, --target-device, ipad, --minimum-deployment-target, 12.0, --output-partial-info-plist, /Users/h9842/projects/games/reproduce-issue-libgdx-romovm/ios/robovm-build/tmp/Unnamed/ios/arm64-simulator/partial-plists/LaunchScreen.storyboard_7601392009758403706.plist, --auto-activate-custom-fonts, --output-format, human-readable-text, --compilation-directory, /Users/h9842/projects/games/reproduce-issue-libgdx-romovm/ios/robovm-build/tmp/Unnamed/ios/arm64-simulator/IOSLauncher.app/Base.lproj, /Users/h9842/projects/games/reproduce-issue-libgdx-romovm/ios/data/Base.lproj/LaunchScreen.storyboard]' failed (Exit value: 1)
	at org.apache.commons.exec.DefaultExecutor.executeInternal(DefaultExecutor.java:404)
	at org.apache.commons.exec.DefaultExecutor.execute(DefaultExecutor.java:166)
	at org.robovm.compiler.util.Executor.exec(Executor.java:344)
	at org.robovm.compiler.util.ToolchainUtil.ibtool(ToolchainUtil.java:359)
	at org.robovm.compiler.target.ios.IOSTarget5ドル.processFile(IOSTarget.java:960)
	at org.robovm.compiler.config.Resource.walk(Resource.java:447)
	at org.robovm.compiler.config.Resource.walk(Resource.java:454)
	at org.robovm.compiler.config.Resource.walk(Resource.java:434)

9 replies

@hennadiib

hennadiib Jan 19, 2026
Author

My simulators may be outdated...checking one more thing now.
Output of command you provided:

/Applications/Xcode.app/Contents/Developer/usr/bin/actool --output-format human-readable-text --app-icon AppIcon --output-partial-info-plist /Users/h9842/projects/games/capitosh-game/ios/build/robovm.tmp/partial-plists/Assets.xcassets_47264947165383153.plist --platform iphonesimulator --export-dependency-info /Users/h9842/projects/games/capitosh-game/ios/build/robovm.tmp/assetcatalog_dependencies --minimum-deployment-target 11.0 --target-device iphone --target-device ipad --compress-pngs --compile /Users/h9842/projects/games/capitosh-game/ios/build/robovm.tmp/IOSLauncher.app /Users/h9842/projects/games/capitosh-game/ios/data/Assets.xcassets
/* com.apple.actool.errors */
/Users/h9842/projects/games/capitosh-game/ios/data/Assets.xcassets: error: No simulator runtime version from ["21A342", "21C62"] available to use with iphonesimulator SDK version 23C53
/* com.apple.actool.compilation-results */
/Users/h9842/projects/games/capitosh-game/ios/build/robovm.tmp/IOSLauncher.app/AppIcon60x60@2x.png
/Users/h9842/projects/games/capitosh-game/ios/build/robovm.tmp/IOSLauncher.app/AppIcon76x76@2x~ipad.png
/Users/h9842/projects/games/capitosh-game/ios/build/robovm.tmp/partial-plists/Assets.xcassets_47264947165383153.plist

@dkimitsa

dkimitsa Jan 19, 2026
Maintainer

I use 26.1.1.

error: No simulator runtime version from ["21A342", "21C62"] available to use with iphonesimulator SDK version 23C53

there are issues with simulator runtime as I mentioned above. Try removing not available / fixing them through Xcode-devices menu.

@hennadiib

hennadiib Jan 19, 2026
Author

UPDATE - give me 10 minutes :) Seams I see issue...

@dkimitsa I try to cleanup all the simulators I have.
error still the same:
/Users/h9842/projects/games/capitosh-game/ios/data/Assets.xcassets: error: No simulator runtime version from ["21A342", "21C62"] available to use with iphonesimulator SDK version 23C53

Can you once again point me on possible solution? Can not understand why it works for you and not for me...

@dkimitsa

dkimitsa Jan 19, 2026
Maintainer

21A342", "21C62" seems to be related to ios17 runtime.

I would go to Xcode-Settings-Components and check what iOS simulators you have there.
probably iOS17 are broken one.

the option would be to delete all not required/broken (or all).
and re-install if you need anything other than iOS 26

Answer selected by hennadiib

@hennadiib

hennadiib Jan 19, 2026
Author

Oh man, you are so right! @dkimitsa
The problem was with simulator...
I used Xcode few years back for similar task (start simulator) and created some fake project for that.
Opened always this project in Xcode... Just now I created new one, Xcode trigger automatically installing new simulator.
Issue solved. App started as expected.
I burned two days on this 🙂 So ridiculous.

Thanks a lot for your time, patience, and support!

(Тищі і миру на батьківщині)

Support Xcode 26 #832

Uh oh!

hennadiib Jan 18, 2026

Replies: 3 comments · 10 replies

Uh oh!

dkimitsa Jan 18, 2026 Maintainer

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hennadiib Jan 18, 2026 Author

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dkimitsa Jan 18, 2026 Maintainer

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hennadiib Jan 19, 2026 Author

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hennadiib Jan 19, 2026 Author

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dkimitsa Jan 19, 2026 Maintainer

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hennadiib Jan 19, 2026 Author

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dkimitsa Jan 19, 2026 Maintainer

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hennadiib Jan 19, 2026 Author

hennadiib
Jan 18, 2026

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dkimitsa
Jan 18, 2026
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hennadiib
Jan 18, 2026
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dkimitsa Jan 18, 2026
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hennadiib
Jan 19, 2026
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hennadiib Jan 19, 2026
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dkimitsa Jan 19, 2026
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hennadiib Jan 19, 2026
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dkimitsa Jan 19, 2026
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hennadiib Jan 19, 2026
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