Burst compiler failed running after Xcode update

Unity Engine
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1

Today I updated to Xcode 16 and my project fails to build because of this:

BuildFailedException: Burst compiler (1.6.6) failed running

stdout:
stderr:
llvm-lipo: error: ‘Temp/StagingArea/StaticLibraries/lib_burst_generated64.a’: ‘Temp/StagingArea/StaticLibraries/lib_burst_generated64.a’: Invalid value (Producer: ‘APPLE_1_1600.0.26.3_0’ Reader: ‘LLVM 12.0.0’)

Project was building perfectly fine before and nothing else changed, I do need to use Burst so would rather not disable.

Also, I don’t know why the only version of Burst that I’m allowed to install is 1.6.6, there’s newer ones but they are not offered to me.

The unity editor is 2021.3.32f1 LTS, I tried deleting the library, building to a new folder which usually fixes things for me but no luck,

Any help appreciated

2

Hi, can you please try to manually update the version of Burst that you’re using?

You should be able to do this by opening the Package Manager, pressing the Add (+) button and adding a package by name. Enter com.unity.burst for the name and 1.8.18 for the version. You can refer to the documentation here: Unity - Manual: Install a UPM package by name

Let us know if you’re still seeing this error after updating Burst and restarting your Editor. It’s also worth trying to delete the Library > BurstCache folder after updating.

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