UnsatisfiedLinkError: com.apple.opencl

[scootermorris]

Version

3.3.1

Platform

macOS arm64

JDK

Temurin-17.0.4.1+1

Module

OpenCL

Bug description

In the most recent versions of MacOS (13.1) our application has been failing to initialize OpenCL with a backtrace failing to find com.apple.opencl.

Stacktrace or crash log output

java.lang.UnsatisfiedLinkError: Failed to retrieve bundle with identifier: com.apple.opencl
    at org.lwjgl.system.macosx.MacOSXLibraryBundle.getWithIdentifier(MacOSXLibraryBundle.java:31)
    at org.lwjgl.system.macosx.MacOSXLibrary.getWithIdentifier(MacOSXLibrary.java:20)
    at org.lwjgl.opencl.CL.create(CL.java:63)
    at org.lwjgl.opencl.CL.<clinit>(CL.java:45)
    at org.cytoscape.cycl.internal.CyCL.initialize(CyCL.java:54)
    at org.cytoscape.cycl.internal.CyActivator.lambda$start$0(CyActivator.java:32)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
    at java.base/java.lang.Thread.run(Thread.java:833)

[ws909]

Without further investigation, it may just seem that Apple removed OpenCL from the OS.

Many discussions online, such as this one: https://discussions.apple.com/thread/254008829

Maybe it's possible to provide an implementation on top of Metal, similar to MoltenVK for Vulkan.

[scootermorris]

Yes, OpenCL, as well as OpenGL have been deprecated since 10.14, but so far, they haven't removed them from the OS. OpenGL, at least, continues to work. We're hoping that there is a relatively easy workaround (install old library, etc.).

[ws909]

So you have confirmed that the OpenCL library actually is present on your machine? If it's still there, has its path or name changed?

[scootermorris]

We're comparing our Ventura Macs (which don't work) with older OS versions (which to work). Will let you know what we find, but I suspect that a library is missing.

[Spasi]

Thank you @scootermorris, this will be fixed in the next snapshot.

The problem was that CFBundleGetBundleWithIdentifier("com.apple.opencl") does not work anymore on macOS 13. The same call with com.apple.opengl does work. I've changed both to use dlopen("<framework path>") and both OpenCL and OpenGL work fine on macOS 12 (tested on old Intel macbook) and 13 (tested on M2 macbook).