Re: [OE-core] [PATCH 0/4] Oe-selftest for Clang, LLVM, LLD

["Mathieu Dubois-Briand" <mathieu.dubois-briand@bootlin.com>]

On Fri Feb 20, 2026 at 7:02 AM CET, Deepesh via lists.openembedded.org Varatharajan wrote:
> From: Deepesh Varatharajan <Deepesh.Varatharajan@windriver.com>
>
> This patch series introduces a test framework to run selftests for
> target builds of Clang, LLVM, and LLD.
>
> Summary of changes:
> -Patch 1: Disable clang-tools-extra tests, as Clang's CMake cannot
>           detect the llvm-bcanalyzer target.
> -Patch 2: Enabled the necessary CMake flags for clang, llvm & lld tests
> -Patch 3: Selftest script for Clang, LLVM, and LLD including exclude list
> -Patch 4: Fix rust build failure by replacing target llvm-config with native
>
> Testing:
> 1. The test suite has been successfully validated on x86-64, arm64, riscv64
> and arm32 for all Clang, LLD & LLVM components.
> 2. Clang and LLD tests passed successfully on x86. LLVM tests are skipped
> on x86 since it's broken. A follow-up bug will be filed and addressed.
> 3. Clang, LLVM & LLD all together ~80K tests are there and we currently
> ~250 tests to exclude list which are failing (0.32%).
>
> Impact on build time:
> These builds were executed in a controlled environment without poky-sstate
> enabled.
>
> Default(without changes):
> |  Target   | Run 1      | Run 2      | Run 3      |    Average     |
> | --------- | ---------- | ---------- | ---------- | -------------- |
> |   llvm    | 22m18.441s | 22m31.905s | 22m23.718s |   22m24.688s   |
> |   clang   | 30m09.774s | 30m22.680s | 30m15.312s |   30m15.922s   |
> |   lld     | 1m26.994s  | 1m30.415s  | 1m29.006s  |   1m28.805s    |
>
> With the testsuite changes applied:
> |  Target   | Run 1      | Run 2      | Run 3      |    Average     |
> | --------- | ---------- | ---------- | ---------- | -------------- |
> |   llvm    | 23m32.104s | 23m45.887s | 23m38.157s |   23m38.716s   |
> |   clang   | 30m31.402s | 30m46.198s | 30m39.445s |   30m39.015s   |
> |   lld     | 1m29.845s  | 1m34.212s  | 1m31.925s  |   1m31.994s    |
>
> Comparison:
> |  Target   | Default Avg | With Changes Avg |     **Diff**     |
> | --------- | ----------- | ---------------- | ---------------- |
> |   llvm    | 22m24.688s  | 23m38.716s       |   +1m14.028s     |
> |   clang   | 30m15.922s  | 30m39.015s       |   +0m23.093s     |
> |   lld     | 1m28.805s   | 1m31.994s        |   +0m3.189s      |
>
> Impact on tmpdir size:
> | Metric                               | Size  |
> | ------------------------------------ | ----- |
> | Default target `tmpdir` size         | 74 GB |
> | Target `tmpdir` size (after changes) | 79 GB |
> | Difference                           | +5 GB |
>
> Deepesh Varatharajan (4):

Hi Deepesh,

It looks like some selftests are failing:

2026-02-20 20:32:17,178 - oe-selftest - INFO - clang.LLVMSelfTestSystemEmulated.test_llvm (subunit.RemotedTestCase)
2026-02-20 20:32:17,179 - oe-selftest - INFO -  ... FAIL
...
2026-02-20 20:32:17,179 - oe-selftest - INFO - 3: 1/1 8/21 (298.44s) (0 failed) (clang.LLVMSelfTestSystemEmulated.test_llvm)
2026-02-20 20:32:17,179 - oe-selftest - INFO - testtools.testresult.real._StringException: Traceback (most recent call last):
  File "/srv/pokybuild/yocto-worker/qemux86-64-tc/build/layers/openembedded-core/meta/lib/oeqa/core/decorator/__init__.py", line 35, in wrapped_f
    return func(*args, **kwargs)
  File "/srv/pokybuild/yocto-worker/qemux86-64-tc/build/layers/openembedded-core/meta/lib/oeqa/selftest/cases/clang.py", line 184, in test_llvm
    raise AssertionError(f"llvm-lit failed for LLVM: {output}")
AssertionError: llvm-lit failed for LLVM: sh: cd: line 0: can't cd to /srv/pokybuild/yocto-worker/qemux86-64-tc/build/build-st-177928/tmp/work/x86-64-v3-poky-linux/llvm/21.1.8/build/bin: No such file or directory
...
2026-02-20 20:32:20,596 - oe-selftest - INFO - clang.LLDSelfTestSystemEmulated.test_lld (subunit.RemotedTestCase)
2026-02-20 20:32:20,597 - oe-selftest - INFO -  ... FAIL
...
2026-02-20 20:32:20,814 - oe-selftest - INFO - clang.ClangSelfTestSystemEmulated.test_clang (subunit.RemotedTestCase)
2026-02-20 20:32:20,815 - oe-selftest - INFO -  ... FAIL

https://autobuilder.yoctoproject.org/valkyrie/#/builders/66/builds/3243
https://autobuilder.yoctoproject.org/valkyrie/#/builders/58/builds/1069
https://autobuilder.yoctoproject.org/valkyrie/#/builders/42/builds/3147
https://autobuilder.yoctoproject.org/valkyrie/#/builders/28/builds/3165
https://autobuilder.yoctoproject.org/valkyrie/#/builders/5/builds/3151

Can you have a look at these failures?

Thanks,
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com