[windows-11-arm] `libclang` broken

[larseggert]

Type of issue

• Error when running a workflow.
• Request for additional tools or software for an existing image.
• Request for a new image, Linux or Windows.
• Other

Describe the issue
The libclang installation seems to be broken.

To Reproduce
See https://github.com/mozilla/neqo/actions/runs/14637255215/job/41071172528?pr=2591#step:6:329

Expected behavior
Would expect the LoadLibraryExW call to succeed.

Screenshots

 Unable to find libclang: "the `libclang` shared library at C:\\Program Files\\LLVM\\bin\\libclang.dll could not be opened: LoadLibraryExW failed"

Desktop (please complete the following information):

• OS: [windows-11-arm]

[jeremyd2019]

The LLVM installation is probably also x86_64 and you're trying to load it from an aarch64 process.

[kasper93]

The LLVM installation is probably also x86_64 and you're trying to load it from an aarch64 process.

Exactly. You can use https://github.com/marketplace/actions/install-llvm-and-clang to install aarch64 version. Or download manually https://github.com/llvm/llvm-project/releases Note that prebuilt binaries for aarch64 are available since v20.1.0.

Generally this image has most tools installed in x86 versions and uses emulation. I think it's not sustainable, especially since the target of those images is to build/test native aarch64 binaries. I think the better strategy would be to install only native binaries in base image and if anything is not available at the time it can be installed by the user as x86, but with explicit decision to do so as it carry some implications.

[pareenaverma]

Thank you for reporting this issue. We will updating the LLVM toolchain with the native arm installation in the next version of the image.

[jeremyd2019]

# file /c/Program\ Files/LLVM/bin/libclang.dll
/c/Program Files/LLVM/bin/libclang.dll: PE32+ executable for MS Windows 6.00 (DLL), ARM64, 8 sections

[larseggert]

@pareenaverma this issue is still present with the latest image.

[reneleonhardt]

Seems to be broken on ubuntu-24.04-arm too, although the same clang versions 16, 17, 18 are installed in ubuntu-24.04:

https://github.com/cberner/redb/actions/runs/17587094530/job/50312248082?pr=1069#step:12:185

warning: clang-sys@1.8.1: could not execute llvm-config one or more times, if the LLVM_CONFIG_PATH environment variable is set to a full path to valid llvm-config executable it will be used to try to find an instance of libclang on your system: "couldn't execute llvm-config --prefix (path=llvm-config) (error: No such file or directory (os error 2))"

called Result::unwrap() on an Err value: "couldn't find any valid shared libraries matching: ['libclang.so', 'libclang-*.so'], set the LIBCLANG_PATH environment variable to a path where one of these files can be found (invalid: [])"

Would it be possible to generate a file listing of all installed software versions mentioned in arm-ubuntu-24-image.md and include it in this repo after building the image, i.e. arm-ubuntu-24-image-files.txt?

[larseggert]

At the rate this is going, I'm considering the ARM runner images abandoned.

[jasonrandrews]

llvm-config is now available on Ubuntu images.

[pbk8s]

@larseggert llvm-config is supported on the latest Windows images as well.