Xcode 16.1 beta (and Slather 2.8.4) - Failed to load coverage: unsupported instrumentation profile format version

[OliverBrown-Next]

I recently updated to Slather 2.8.4 to fix the Xcode 16 compatibility issue.

Using Xcode 16.1 beta, It works well locally, so thank you for that :)
But when running in CI (Azure DevOps), I get the following error

Slathering...
error: Failed to load coverage: '/Users/runner/Library/Developer/Xcode/DerivedData/Assets-cecsqcpehsibqugchwzmtqbbxlil/Build/ProfileData/21543275-1377-4AC5-82B2-8929738D1C83/Coverage.profdata': unsupported instrumentation profile format version
error: Could not load coverage information
Slathered

I've attached the Coverage.profdata file, but I'm not sure what else I can do to investigate the issue. If there is anything else I can provide to help, please let me know.

Coverage.profdata.zip

One possible reason is the Azure DevOps build agent is an Intel mac and I'm running on Apple Silicon locally. This previously worked fine with Xcode 15.

[jarrodlombardo-EventBase]

My understanding was that XCode 15.0+ doesn't fully support Intel macs, so if this only repros on an Intel Mac with XCode 16+, my suggestions is to won't fix this. If we can get a repro on an Apple Silicon mac, we should investigate.

[SurendraMetrobank]

I'm also facing exactly same issue which @OliverBrown-Next is facing, my pipeline is Azure DevOps, Xcode 16.2 and Slather 2.8.4
error: Failed to load coverage: '/Users/runner/work/1/s/mobile/ios/fastlane/build/Coverage/Coverage.profdata': unsupported instrumentation profile format version

[Cschau0701vip]

My understanding was that XCode 15.0+ doesn't fully support Intel macs, so if this only repros on an Intel Mac with XCode 16+, my suggestions is to won't fix this. If we can get a repro on an Apple Silicon mac, we should investigate.

Hey @jarrodlombardo-EventBase,

We're facing the same issue with the different combination tried on Azure DevOps server and local XCode on apple macOS.
Here are the below specifications:

Local: -

• MacOS 15.3 / 15.4.1
• XCode 16.1 / 16.2 / 16.3
• iOS 18.0 / 18.2 / 18.4
• Slather 2.8.0 / 2.8.5

Azure Agents: -

• MacOS 14.7.5 / 15.4.1
• XCode 16.1 / 16.2 / 16.3
• iOS 18.0 / 18.2 / 18.4
• Slather 2.8.0 / 2.8.5

Please find the below screenshots and error logs for the same:

• Server:
  
  

• Local: -
  
  
  

• Error: -
  

error: Failed to load coverage: '/Users/runner/Library/Developer/Xcode/DerivedData/*/Build/ProfileData/337BCC5B-70E0-4F09-8553-44831B4857A7/Coverage.profdata': unsupported instrumentation profile format version
error: Could not load coverage information
/usr/local/Cellar/ruby@3.3/3.3.8/lib/ruby/3.3.0/json/common.rb:220:in `parse': unexpected token at '' (JSON::ParserError)
	from /usr/local/Cellar/ruby@3.3/3.3.8/lib/ruby/3.3.0/json/common.rb:220:in `parse'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/project.rb:135:in `pathnames_per_binary'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/project.rb:124:in `block in profdata_coverage_files'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/project.rb:123:in `each'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/project.rb:123:in `profdata_coverage_files'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/project.rb:98:in `coverage_files'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/coverage_service/cobertura_xml_output.rb:18:in `post'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/command/coverage_command.rb:108:in `post'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/lib/slather/command/coverage_command.rb:64:in `execute'
	from /usr/local/lib/ruby/gems/3.3.0/gems/clamp-1.3.2/lib/clamp/command.rb:66:in `run'
	from /usr/local/lib/ruby/gems/3.3.0/gems/clamp-1.3.2/lib/clamp/subcommand/execution.rb:18:in `execute'
	from /usr/local/lib/ruby/gems/3.3.0/gems/clamp-1.3.2/lib/clamp/command.rb:66:in `run'
	from /usr/local/lib/ruby/gems/3.3.0/gems/clamp-1.3.2/lib/clamp/command.rb:140:in `run'
	from /usr/local/lib/ruby/gems/3.3.0/gems/slather-2.8.0/bin/slather:17:in `<top (required)>'
	from /usr/local/lib/ruby/gems/3.3.0/bin/slather:25:in `load'
	from /usr/local/lib/ruby/gems/3.3.0/bin/slather:25:in `<main>'

We have tried running multiple attempts and with different combinations but not able to get the .profdata generated. Could you please look into it and help us to resolve this issue? Thank you!

[jarrodlombardo-EventBase]

@Cschau0701vip Your issue is a dup of #567 and fixed in Slather 2.8.4. Your issue is not what the prior messages on this issue are talking about.

@SurendraMetrobank @OliverBrown-Next Please provide more information about your repro on a supported platform (XCode15+ requires an M-series Mac; intel hardware is no longer supported by XCode 15+ so Slather can't possibly work there)

[OliverBrown-Next]

We're using Xcode 16.2, and we're definitely building on Intel macs.
Output from uname -m: x86_64
Output from sysctl hw.model: Macmini6,2
More information here https://github.com/actions/runner-images/blob/macos-15/20250428.1214/images/macos/macos-15-Readme.md
It's not exactly conclusive regarding architecture, but a bunch of tools do have "x64" in their details.

I'm not sure what more information would be useful. Last time I tried Slather it was fine locally (on an M3 MacBook Pro).

At this point I'm willing to accept intel macs being too difficult or low priority to support.