build disappears

However, I'm told by an engineer on the kernel team that the arm install instructions here work: https://kernelshaman.blogspot.com/2021/02/building-xnu-for-macos-112-intel-apple.html Thank you Kevin, I'll give that a try in the coming days. As for x64 vs arm, I am interested in arm since that's what I have access to.

Historically I’ve seen errors like this when different parts of your Mach-O image — so object (.o) files or static libraries (.a) — are build with different tools or different deployment targets. Make sure that: You’ve rebuilt everything with Xcode 26. Your deployment targets are consistent. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = eskimo + 1 + @ + apple.com

I ran some tests and can confirm that with Xcode 26, xcodebuild now works just as fast as Xcode 16 with the workaround. This is true both when rebuilding the app without any changes and when performing incremental builds after making changes. I also noticed that Xcode 26 no longer calls the slow developerservices2.apple.com. Instead, it uses https://ocsp2.apple.com, which is much faster.

Hi, Following the advice I received here, I switched to using NSStagedMigrationManager instead of trying to drive a custom NSMappingModel entirely in code. I now have a staged migration pipeline with two stages: • Stage 1 (V1 → V2): a lightweight migration. • Stage 2 (V2 → V3): a custom migration where I re-archive a Transformable attribute (object) from a legacy ValueTransformer to a safe binary format (GraphArchiver). Both models are built entirely at runtime (no .xcdatamodeld files). Each model has a unique versionChecksum string (hardcoded identifiers: GraphCK_MigrationV1, GraphCK_MigrationV2, GraphCK_MigrationV3). When I run the staged migration manager with these two stages, I consistently hit this exception: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Duplicate version checksums across stages detected.' Debug logging shows: Stage1 checksums: [GraphCK_MigrationV1, GraphCK_MigrationV2] Stage2 checksums: [GraphCK_MigrationV2, GraphCK_MigrationV3] So the identifiers

Is there any recent and a bit authoritative documentation which explains how to debug recent versions of macos kernel? No, nothing for arm* that's directly published by Apple. However, I'm told by an engineer on the kernel team that the arm install instructions here work: https://kernelshaman.blogspot.com/2021/02/building-xnu-for-macos-112-intel-apple.html *The process for Intel hasn't really changed. __ Kevin Elliott DTS Engineer, CoreOS/Hardware

On my Mac mini M4 Pro, I’ve installed macOS Tahoe 26.0 and Xcode 26.0.1. The error message still appears, even when testing with the iPhone 17 Pro and iPad Pro 11-inch M4 simulators. The FB numer is: FB20362054 == PREVIEW UPDATE ERROR: GroupRecordingError Error encountered during update group #19 ================================== | FailedToLaunchAppError: Failed to launch net.thomasbayer.ChatPrototype | | ================================== | | | [Remote] JITError | | | | ================================== | | | | | [Remote] CouldNotLoadInputObjectFile: Could not load object file during preview: /Users/thomas/Library/Developer/Xcode/DerivedData/ChatPrototype-ebbbmisjgapzykawaadxudtxyjmg/Build/Intermediates.noindex/ChatPrototype.build/Debug-iphonesimulator/ChatPrototype.build/Objects-normal/arm64/ChatPrototypeApp.o | | | | | | path: /Users/thomas/Library/Developer/Xcode/DerivedData/ChatPrototype-ebbbmisjgapzykawaadxudtxyjmg/Build/Intermediates.noindex/ChatPrototype.build/Debug-iphonesimulator