llvm init issue after update fedora38->fedora39

[nbecker]

I had a working sionna setup on fedora38. After update to fedora39 I get:

jit_llvm_init(): detected LLVM version lacks critical functionality, shutting down LLVM backend..

Any ideas how to debug this? I have a number of llvm libaries:

llvm-libs-17.0.6-3.fc39.x86_64
llvm16-libs-16.0.6-5.fc39.x86_64
llvm15-libs-15.0.7-4.fc39.x86_64
llvm-static-17.0.6-3.fc39.x86_64
llvm-17.0.6-3.fc39.x86_64
llvm-test-17.0.6-3.fc39.x86_64
llvm-googletest-17.0.6-3.fc39.x86_64
llvm-devel-17.0.6-3.fc39.x86_64

[merlinND]

Hello @nbecker,

First, are you relying on the LLVM backend or are you using a CUDA GPU? If you are using the CUDA backend, then this warning can be ignored.

I don't know much about Fedora and what default paths it uses, so I'm not sure which LLVM version is getting picked up. You can specify one explicitly using the DRJIT_LIBLLVM_PATH environment variable.

[nbecker]

I am relying on CUDA GPU. After installing various cuda libraries I get this when running my test code:

 ./32apsk_cnn_newsspa.py --action=run-baseline
jit_llvm_init(): detected LLVM version lacks critical functionality, shutting down LLVM backend..
Number of GPUs available : 1
Only GPU number 0 used.

I assume that this is then just a harmless warning?

[merlinND]

Yes, if the CUDA backend works fine for you, feel free to ignore that warning message.