UE 5.5 Source Build Issues on macOS Tahoe (Xcode schemes, compilation errors, missing configs)

Development Pipeline & Plugins
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I’m trying to work with a UE 5.5 source build (Perforce) on macOS (latest Tahoe) and running into multiple issues while setting up and building the engine.

:brick: Setup:

  • macOS Tahoe (latest)
  • Xcode installed
  • UE 5.5 source build (same as Windows setup)

:red_circle: Issues

1. Source build instability

  • Build fails during compilation
  • Errors appear in modules like:
  • UnrealEd
    +
    • ContentBrowser

2. Xcode setup issues

  • Schemes are not properly generated
  • Unable to find or select correct targets
  • Difficulty building editor binaries

3. Missing / inconsistent configs

  • iOS-related configs differ from launcher build
  • Some expected files/folders not present in source build

4. General inconsistency

  • Launcher version works fine on Mac
  • Source build behaves unpredictably
  • DotNet / UnrealBuildTool inconsistencies observed

:red_circle: Observations

  • Same project works on Windows (except iOS rsync issue)
  • macOS source build does not behave like launcher version
  • Possible mismatch in source build setup or dependencies

:red_question_mark: Questions

  1. Is UE 5.5 source build fully stable on macOS Tahoe?
  2. Are there additional steps required for:

  • Xcode setup?

  • scheme generation?

  1. Any known issues with:

  • UnrealBuildTool on macOS?

  • missing config files in source builds?
    +

  1. Recommended workflow for syncing Windows + macOS builds?

:bullseye: Goal

  • Stable UE 5.5 source build on macOS
  • Proper Xcode integration
  • Reliable iOS development workflow

Any guidance would be greatly appreciated.

Thanks!

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2

Steps to Reproduce:

  1. Sync UE 5.5 source build from Perforce on macOS (Tahoe).
  2. Run setup:
  3. ./Setup.sh
  4. ./GenerateProjectFiles.sh
  5. Open the generated Xcode project/workspace.
  6. Attempt to build Unreal Editor target.
  7. Alternatively, try building via command line:
  8. ./Engine/Build/BatchFiles/Mac/Build.sh UnrealEditor Mac Development

S

Result:

  • Build fails during compilation:
    • Errors in modules like UnrealEd / ContentBrowser
  • Xcode issues:
    • Schemes not properly configured or missing
  • Inconsistencies:
    • Missing or different iOS-related config compared to launcher build
  • Overall:
    • Source build is unstable compared to launcher version

t

Workaround Attempts:

  • Clean build folders
  • Re-run Setup and GenerateProjectFiles
  • Re-sync from Perforce

:backhand_index_pointing_right: Issue persists despite clean setup

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3

Hello Zaib,

UE 5.5 predates Tahoe by a year and is unfortunately incompatible with Xcode 16.4 and higher out of the box due to Apple updates to Clang toolchain. While it is achievable to update the 5.5 codebase for this purpose, there is no LTS on this particular release. Is moving to the more recent 5.7 release a possibility for your team? Otherwise, we could potentially provide limited assistance for resolving issues and get up and running on Tahoe / Xcode 26+ ?(which is now required for App Store submission).

Also, on a side note, Setup.sh isn’t necessary when running from Perforce, this is for binary fetch of dependencies when using Git repos or releases.

Best regards.

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