XCode 13 beta fails to load Metal CoreImage Kernel

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Created Aug ’21

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This is a weird XCode 13 beta bug (including beta 5). Metal Core Image kernels fail to load from the library giving error

2021-08-26 12:05:23.806226+0400 MetalFilter[23183:1751438] [api] +[CIKernel kernelWithFunctionName:fromMetalLibraryData:options:error:] Cannot initialize kernel with given library data.

[ERROR] Failed to create CIColorKernel: Error Domain=CIKernel Code=6 "(null)" UserInfo={CINonLocalizedDescriptionKey=Cannot initialize kernel with given library data.}

But there is no such error with XCode 12.5. The kernel loads fine. Only on XCode 13 beta there is an error.

Answered by FrankSchlegel in 686043022

It should work when you remove the -I $MTL_HEADER_SEARCH_PATHS part from your custom build rule.

Though it is mentioned in the WWDC video, it actually causes problems when MTL_HEADER_SEARCH_PATHS is empty. See this answer to a related question. Usually, you don't need that parameter if you don't have a complicated file graph or external dependencies.

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Answer 1

testinstadev OP

Aug ’21

Here is the sample code with which the bug can be reproduced. It works flawlessly on XCode 12 but not on XCode 13 beta

https://github.com/JoshuaSullivan/MetalKernel

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Answer 2

FrankSchlegel OP

Aug ’21

Accepted Answer

It should work when you remove the -I $MTL_HEADER_SEARCH_PATHS part from your custom build rule.

Though it is mentioned in the WWDC video, it actually causes problems when MTL_HEADER_SEARCH_PATHS is empty. See this answer to a related question. Usually, you don't need that parameter if you don't have a complicated file graph or external dependencies.

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