Cordell Bloor:
Hi Ximin,
On 2025-11-17 13:54, Ximin Luo wrote:
When I install leela-zero and rocm-opencl-icd (from sid), then run leelaz, I
get the following error:
Error building kernels: fatal error: malformed or corrupted precompiled file:
'could not find file '/usr/lib/llvm-21/lib/clang/21/include/opencl-c-base.h'
referenced by AST file '/tmp/comgr-e99bbb/include/opencl1.2-c.pch''
Installing libclang-common-21-dev which contains this file, fixes the problem.
Thank you for the report! That's an interesting problem. I think I need to investigate a
bit to understand what's actually happening before I add the dependency. However, I'm
struggling to find a compatible set of weights for leela-zero on sid. Everything I try
seems to result in an error stating "Weights file is the wrong version." Could
you provide a more detailed set of steps to reproduce the problem?
Ah, I last downloaded the weights file back in 2021, the upstream project may
have moved on in the meantime. I've uploaded my old one here:
https://people.debian.org/~infinity0/leelaz/
You can drop it into ~/.local/share/leela-zero/best-network then it should work.
When I experiment running other OpenCL applications, such as clpeak or
clblast-tests, I don't seem to have the same problem. I suppose this must be
related to a particular rocm-opencl-icd feature that (in turn) depends on a
particular libamd-comgr3 feature.
It's good that it seems that there's a straightforward workaround.
Sincerely,
Cory Bloor
Thanks for taking a look! Unfortunately I don't know anything about how this stuff works
in terms of the GPU technical details. But you can get the corresponding old version of
the source code via "apt source leela-zero", that should tell you how this old
version of the weights is actually being used.
Best,
Ximin
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