Error in gathering code coverage in Xcode16

Question

Created Dec ’24

Replies 7

Boosts 9

Views 1k

Participants 5

Fails to gather code coverage and throws this error

Showing All Messages Failed to merge raw profiles in directory /Users//Library/Developer/Xcode/DerivedData/Receiver-ekqrbpsaciuxmlfslviajhoecyat/Build/ProfileData/0B0C6B69-FD46-4801-B106-56B7FCD44370 to destination /Users//Library/Developer/Xcode/DerivedData/Receiver-ekqrbpsaciuxmlfslviajhoecyat/Build/ProfileData/0B0C6B69-FD46-4801-B106-56B7FCD44370/Coverage.profdata: Aggregation tool '/Users/shwethamugeraya/Downloads/Xcode 2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/llvm-profdata' failed with exit code 1: warning: /Users/shwethamugeraya/Library/Developer/Xcode/DerivedData/Receiver-ekqrbpsaciuxmlfslviajhoecyat/Build/ProfileData/0B0C6B69-FD46-4801-B106-56B7FCD44370/2F4EFBF7-1CCF-4E9E-8FD6-482EEDB98B6C-34646.profraw: raw profile version mismatch: Profile uses raw profile format version = 4; expected version = 8 PLEASE update this tool to version in the raw profile, or regenerate raw profile with expected version. error: no profile can be merged

Answered by jarrodlombardo-eventbase in 862257022

To be more clear than my post from August 2025, the solution is to rebuild all of your upstream dependencies with a version of XCode that includes the same version of clang that your version of XCode includes. The easiest way to be sure that upstream and your app uses the same clang is to build them both with the same XCode. If you rely on a library that you cannot rebuild, you need to file a bug with the maintainer for them to do that rebuild. Until those things have ALL been built with the same version of clang, you will not be able to see code coverage data.

Boost

Answer 1

MCStoufer1 OP

May ’25

I'm seeing this in 16.3 as well. Possibly due to ancient .xcframeworks injected by Carthage. An older version of Xcode should be able to view the offending .profraw files and at least dump some info to show what framework it came from. Now on Sequoia, so going back far enough is no longer an option. Boo!

2

Answer 2

MCStoufer1 OP

May ’25

I've opened Feedback: FB17628220 for this. There appears to be something wrong with the later 18.3, .4 SDKs as the profraw file that is pulled from the Simulator is just in the wrong format.

FWIW, also tested in Xcode 16.4 (iOS 18.5) and still no go.

8

Answer 3

jarrodlombardo-eventbase OP

Jul ’25

I'm seeing the same issue in XCode26 but now it's complaining about raw profile format version = 8; expected version = 10 😢

1

Answer 4

jarrodlombardo-eventbase OP

Aug ’25

I have figured out what's happening here. Code Coverage will ONLY work if ALL upstream dependencies have also been built with the newer version of XCode (and therefore the newer version of clang). A single profraw file will have multiple sections from the many different binaries that make up your build and each of those sections will have a header containing the raw profile version format of the clang that built that binary. For example, my framework built in XCode26 that depends on a binary framework built in XCode16.2 will have profraw headers with both 8 and 10 as the version, meaning that the resulting profraw file cannot be read in XCode26 (which can only read version 10) nor in XCode16.2 (which can only read version 8).

3

Answer 5

mike sldkcjnsdmhvbsdh OP

2w

Same issue

0

Answer 6

jarrodlombardo-eventbase OP

2w

Recommended

To be more clear than my post from August 2025, the solution is to rebuild all of your upstream dependencies with a version of XCode that includes the same version of clang that your version of XCode includes. The easiest way to be sure that upstream and your app uses the same clang is to build them both with the same XCode. If you rely on a library that you cannot rebuild, you need to file a bug with the maintainer for them to do that rebuild. Until those things have ALL been built with the same version of clang, you will not be able to see code coverage data.

2

Answer 7

mike sldkcjnsdmhvbsdh OP

4d

I was using OCmock for my tests and after rebuilding it with same Xcode version as all my other libs the coverage started to generated.

2