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[ROCm][Windows] Install libomp140.x86_64.dll into scikit-build ROCm wheels - #191629

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@ethanwee1 ethanwee1 commented Jul 30, 2026 •

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After the scikit-build-core wheel migration, the Windows ROCm wheel drops torch/lib/libomp140.x86_64.dll, which TheRock stages for MSVC OpenMP. This installs it via CMake when present, mirroring the existing libiomp5md.dll / uv.dll handling. TheRock copies the DLL into torch/lib/ before CMake configure, so the EXISTS guard sees it, and non-ROCm builds are unaffected. It replaces the temporary force-include TheRock carries.

Validation: https://github.com/ROCm/TheRock/actions/runs/38930228545 built a Windows ROCm wheel (gfx1100, py3.12) from release/2.14 with this change cherry-picked (ROCm#3835, 268bf8ed4be); build and the import torch sanity check passed. TheRock still force-includes libomp140 in that build, so it confirms no regression rather than exercising this rule in isolation.

Related PR:

Fixes ROCm/TheRock#6965
Supported by @jeffdaily

Tracked in AIPYTORCH-1516.

cc @jeffdaily @sunway513 @jithunnair-amd @pruthvistony @ROCmSupport @jataylo @hongxiayang @naromero77amd @pragupta @jerrymannil @xinyazhang

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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/191629

Note: Links to docs will display an error until the docs builds have been completed.

✅ You can merge normally! (4 Unrelated Failures)

As of commit ad84124 with merge base 3022368 (image):

NEW FAILURES SUPPRESSED BY AI (non-blocking) - The following jobs failed, but the AI CI Advisor judged the failures not to be evidence against this change:

  • linux-aarch64-binary-manywheel / manywheel-cuda-aarch64-cu130-build (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
    ModuleNotFoundError: No module named 'tabulate'

    AI verdict: AI verdict: not related

    The build fails because tools/bolt_profile_quality.py (the BOLT profile summary step) imports tabulate, which isn't installed in the aarch64 manywheel image. The suspect commit only adds a Windows-only libomp140 install rule in cmake/PostBuildSteps.cmake, and trunk builds of the same job fail with the identical error.

    Full reasoning on HUD →

  • linux-aarch64-binary-manywheel / manywheel-cuda-aarch64-cu132-build (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
    ModuleNotFoundError: No module named 'tabulate'

    AI verdict: AI verdict: not related

    The aarch64 CUDA wheel build fails because tools/bolt_profile_quality.py cannot import tabulate (ModuleNotFoundError) during the BOLT profile summary step. The suspect commit only adds a Windows-only CMake install rule. The same error was already failing this job on earlier trunk commits (ed267a0) and on other commits, so it pre-dates the suspect.

    Full reasoning on HUD →

  • linux-aarch64-binary-manywheel / manywheel-cuda-aarch64-cu134-build (gh) (this job did not run on the merge base, so DrCI cannot tell whether the failure is pre-existing)
    ModuleNotFoundError: No module named 'tabulate'

    AI verdict: AI verdict: not related

    The build fails because tools/bolt_profile_quality.py, a BOLT post-link step that is already in the merge base, imports tabulate, and that module isn't installed in the aarch64 manywheel build image. The suspect commit only adds a Windows-only CMake install of libomp140.x86_64.dll. Several unrelated PRs fail this job with the same error.

    Full reasoning on HUD →

  • trunk / macos-py3-arm64 / test (default, 3, 3, macos-m1-stable) (gh)
    torch_np/test_basic

    AI verdict: AI verdict: not related

    The suspect commit only adds an install() rule inside if(WIN32 AND BUILD_PYTHON) in cmake/PostBuildSteps.cmake, so it has no effect on the macOS arm64 build. The failure was an intermittent OpenMP abort ("OMP: Error Use chainer-style constructor for Conv2d #15 ... found unknown library already initialized") at process startup. In the same job, with the same binary, the serial run of torch_np/test_basic had already passed.

    Full reasoning on HUD →

This comment was automatically generated by Dr. CI and updates every 15 minutes.

@pytorch-bot pytorch-bot Bot added the module: rocm AMD GPU support for Pytorch label Jul 30, 2026

@ScottTodd ScottTodd left a comment

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lgtm from ROCm / TheRock's perspective

Comment on lines +70 to +75
# MSVC OpenMP (libomp140) - TheRock copies this into torch/lib/ before the
# wheel build when using MSVC OpenMP instead of MKL libiomp.
set(_libomp140 "${TORCH_SRC_DIR}/lib/libomp140.x86_64.dll")
if(EXISTS "${_libomp140}")
install(FILES "${_libomp140}" DESTINATION "${TORCH_INSTALL_LIB_DIR}")
endif()

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Similar to #191625, we could consider a USE_ROCM help here to limit when others building pytorch would trigger this code path. Looking at how libiomp5md.dll is used above though, I think not adding a USE_ROCM check is probably fine?

Note that I'm not thrilled about using OpenMP from MSVC in our downstream build scripts, see the comments at https://github.com/ROCm/TheRock/blob/6b2138632e722857796e4b662c64eec7ae21a3ce/external-builds/pytorch/build_prod_wheels.py#L905-L940

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Agreed — I left it without a USE_ROCM guard to match the libiomp5md.dll block above. The EXISTS "${TORCH_SRC_DIR}/lib/libomp140.x86_64.dll" check already scopes this to builds that actually staged that DLL (i.e. TheRock's MSVC-OpenMP path), so non-ROCm builds won't be affected. Point taken on the broader MSVC-OpenMP concern in the TheRock build scripts; I'll follow up on that separately on the TheRock side rather than in this wheel-packaging fix.

Comment thread torch/CMakeLists.txt Outdated
Comment on lines +549 to +554
# _rocm_init.py is generated by TheRock/ROCm packaging before the wheel build
# and gitignored. scikit-build-core's package walk skips it unless we install
# it explicitly (same pattern as version.py above).
if(EXISTS "${TORCH_SRC_DIR}/_rocm_init.py")
install(FILES "${TORCH_SRC_DIR}/_rocm_init.py" DESTINATION ".")
endif()

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FYI this change is also made by #191625, so you may have merge conflicts depending on review/merge ordering.

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Good catch — to avoid the conflict I've dropped the _rocm_init.py install from this PR and let #191625 own that change. This PR is now scoped to just the libomp140.x86_64.dll packaging fix, so the two should merge cleanly regardless of ordering. (Pushed in 049ccf3.)

@ethanwee1 ethanwee1 changed the title Install TheRock-generated _rocm_init.py into scikit-build wheels [ROCm][Windows] Install libomp140.x86_64.dll into scikit-build ROCm wheels Jul 30, 2026
ScottTodd added a commit to ROCm/TheRock that referenced this pull request Jul 30, 2026
… PRs land (#7009)

## Motivation

This passes scikit-build-core force-include settings for our generated
and .gitignore'd `_rocm_init.py` file and Windows OpenMP runtime files.

* Local patch for #6965
* This should be compatible with
  * pytorch/pytorch#191625
  * pytorch/pytorch#191632
  * pytorch/pytorch#191629

## Technical Details

* `python -m build` backend configuration
(https://build.pypa.io/en/stable/how-to/config-settings.html) documents
`-C` as shorthand for `--config-setting`. It forwards `KEY=VALUE`
settings to the selected PEP 517 backend.
* scikit-build-core configuration
(https://scikit-build-core.readthedocs.io/en/stable/configuration/#configuration)
says every setting can be supplied through `pyproject.toml`, PEP 517
config settings, or environment variables. Its examples use dotted CLI
keys such as `-Ccmake.build-type=Debug` (see
https://scikit-build-core.readthedocs.io/en/stable/reference/configs.html#confval-cmake.build-type)
* scikit-build-core’s `wheel.force-include` section
(https://scikit-build-core.readthedocs.io/en/stable/configuration/#force-including-files)
documents the source-to-destination mapping and notes that exact
force-includes override exclusions.

## Test Plan

Trigger builds of pytorch on linux and windows using 'nightly', look for
`_rocm_init.py` and library load succeeding

| Config | Logs | Result |
-- | -- | --
Linux 'nightly' |
https://github.com/ROCm/TheRock/actions/runs/30588591418 | Pending
Linux 'release/2.12' |
https://github.com/ROCm/TheRock/actions/runs/30589526077 | Pending
Windows 'nightly' |
https://github.com/ROCm/TheRock/actions/runs/30588680552 | Pending

## Submission Checklist

- [x] Look over the contributing guidelines at
https://github.com/ROCm/TheRock/blob/main/CONTRIBUTING.md.

Co-authored-by: Codex <codex@openai.com>

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Looks like this change is using an established precedent for dlls.

My concern was the specificity of the 140 in libomp140.x86_64.dll, but this is what my search turned up:

It indicates that the DLL uses the VC14 (Visual C++ 14.x) ABI, not a particular compiler release. Thanks to Microsoft's binary compatibility promise, the same ABI is shared across:
Visual Studio 2015 (v140)
Visual Studio 2017 (v141)
Visual Studio 2019 (v142)
Visual Studio 2022 (v143)
So a libomp140.x86_64.dll might have been built with Visual Studio 2022 and still be named libomp140.x86_64.dll.

@ethanwee1
ethanwee1 requested a review from ScottTodd August 3, 2026 19:01
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Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
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@github-actions github-actions Bot added the Stale label Oct 2, 2026
@ethanwee1
ethanwee1 force-pushed the ew/fix-rocm-init-wheel-6965 branch from 049ccf3 to ab24940 Compare October 14, 2026 14:29
@jithunnair-amd jithunnair-amd added ciflow/trunk Trigger trunk jobs on your pull request ciflow/binaries_wheel Trigger binary build and upload jobs for wheel on the PR keep-going Don't stop on first failure, keep running tests until the end labels Oct 14, 2026
scikit-build-core drops TheRock-staged torch/lib/libomp140.x86_64.dll from
the Windows ROCm wheel. Install it via CMake when present, mirroring the
existing libiomp5md.dll / uv.dll handling. EXISTS-guarded, so non-ROCm and
non-MSVC-OpenMP builds are unaffected.

Fixes ROCm/TheRock#6965
@ethanwee1
ethanwee1 force-pushed the ew/fix-rocm-init-wheel-6965 branch from ab24940 to ad84124 Compare October 15, 2026 16:09
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Workflows were awaiting approval. CI has now been triggered for the ciflow labels on this PR.

@jeffdaily

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@pytorchbot merge -i

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Merge failed

Reason: This PR needs a release notes: label
If your changes are user facing and intended to be a part of release notes, please use a label starting with release notes:.

If not, please add the topic: not user facing label.

To add a label, you can comment to pytorchbot, for example
@pytorchbot label "topic: not user facing"

For more information, see
https://github.com/pytorch/pytorch/wiki/PyTorch-AutoLabel-Bot#why-categorize-for-release-notes-and-how-does-it-work.

Details for Dev Infra team

Raised by workflow job

@jeffdaily jeffdaily added the release notes: rocm mandatorylabel label Oct 16, 2026
@jeffdaily

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@pytorchbot merge -i

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Merge started

Your change will be merged while ignoring the following 4 checks: trunk / macos-py3-arm64 / test (default, 3, 3, macos-m1-stable), linux-aarch64-binary-manywheel / manywheel-cuda-aarch64-cu130-build, linux-aarch64-binary-manywheel / manywheel-cuda-aarch64-cu134-build, linux-aarch64-binary-manywheel / manywheel-cuda-aarch64-cu132-build

Learn more about merging in the wiki.

Questions? Feedback? Please reach out to the PyTorch DevX Team

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jeffdaily added a commit to ROCm/pytorch that referenced this pull request Oct 16, 2026
Both PRs add a Windows DLL install block at the same spot in cmake/PostBuildSteps.cmake. Keep both: the aotriton_v2/liblzma OPTIONAL install from this PR, then the libomp140 install from pytorch#191629, the same order as the release/2.14 cherry-pick (#3835).

Test Plan: a standalone CMake project that includes the resolved if(WIN32 AND BUILD_PYTHON) block, with the FA DLLs generated at build time by a custom target, configured, built and installed with Ninja: all three DLLs installed when present; only the FA DLLs when libomp140 is absent; nothing and no error when none exist.

Authored with Claude.
ethanwee1 added a commit to ROCm/TheRock that referenced this pull request Oct 19, 2026
…w upstream) (#9058)

## Problem
TheRock force-includes `aotriton_v2.dll` and its `liblzma.dll`
dependency into the Windows ROCm wheel as a scikit-build-core
workaround. pytorch/pytorch#200931 installs them via CMake instead, so
the force-include becomes redundant.

## Changes
Remove the `aotriton_v2.dll` + `liblzma.dll` force-includes from
`build_prod_wheels.py`. The `libomp140.x86_64.dll` force-include stays
until its own follow-up.

## Validation
https://github.com/ROCm/TheRock/actions/runs/38930228545 ran this PR's
head (`429936c345`) against release/2.14 with the install rule
cherry-picked (ROCm/pytorch#3835). With the force-include gone, the DLLs
could only ship via the CMake rule; build and the `import torch` sanity
check passed.

Merge only after pytorch/pytorch#200931 is on main and ROCm/pytorch#3835
/ ROCm/pytorch#3836 are on release/2.14 / release/2.15; any
scikit-build-core branch without the install rule would lose the DLLs
(WinError 126). release/2.13 uses setuptools and is unaffected. Merges
cleanly alongside #9055.

Related PR:
- pytorch/pytorch#191629: install `libomp140.x86_64.dll` via CMake
- pytorch/pytorch#200931: install `aotriton_v2.dll` + `liblzma.dll` via
CMake
- #9055: drop the `_rocm_init.py` wheel force-include
- #9058: drop the `aotriton_v2.dll` + `liblzma.dll` wheel
force-includes (this PR)
- ROCm/pytorch#3835: release/2.14 cherry-pick of pytorch/pytorch#191629
+ pytorch/pytorch#200931
- ROCm/pytorch#3836: release/2.15 cherry-pick of pytorch/pytorch#191629
+ pytorch/pytorch#200931
- Issue: #6965

Tracked in AIPYTORCH-1516.
pytorchmergebot pushed a commit that referenced this pull request Oct 19, 2026
…uild ROCm wheels (#200931)

When Flash Attention is built on Windows, `torch_hip.dll` needs `aotriton_v2.dll` and its `liblzma.dll` dependency. aotriton's ExternalProject generates these into `torch/lib/` during the build (after CMake configure) with no install rule, so scikit-build-core omits them from the wheel and `import torch` fails with WinError 126.

This adds CMake install rules for both DLLs with `OPTIONAL`, so the existence check runs at install time, after the build has produced them. A configure-time `EXISTS` guard would be false and silently drop them. Flash-Attention-off and non-ROCm builds are unaffected because the files won't exist at install time. It replaces the temporary force-include TheRock carries.

Validation: https://github.com/ROCm/TheRock/actions/runs/38930228545 built a Windows ROCm wheel (gfx1100, py3.12) from release/2.14 with this change cherry-picked (ROCm#3835, identical cmake) and with TheRock's aotriton/liblzma force-include removed (ROCm/TheRock#9058), so the DLLs could only ship via this rule. Build and the `import torch` sanity check passed. The earlier `EXISTS`-guarded revision failed that check with WinError 126 (https://github.com/ROCm/TheRock/actions/runs/38924233036).

Related PR:
- #191629: install `libomp140.x86_64.dll` via CMake
- #200931: install `aotriton_v2.dll` + `liblzma.dll` via CMake (this PR)
- ROCm/TheRock#9055: drop the `_rocm_init.py` wheel force-include
- ROCm/TheRock#9058: drop the `aotriton_v2.dll` + `liblzma.dll` wheel force-includes
- ROCm/TheRock#9360: drop the `libomp140.x86_64.dll` wheel force-include
- ROCm#3835: release/2.14 cherry-pick of #191629 + #200931
- ROCm#3836: release/2.15 cherry-pick of #191629 + #200931
- Issue: ROCm/TheRock#6965

Fixes ROCm/TheRock#6965
Supported by @jeffdaily

Tracked in AIPYTORCH-1516.

Pull Request resolved: #200931
Approved by: https://github.com/ScottTodd, https://github.com/jeffdaily

Co-authored-by: Jeff Daily <jeff.daily@amd.com>
jeffdaily pushed a commit to ROCm/pytorch that referenced this pull request Oct 20, 2026
… libomp140 (#3835)

Cherry-picks the two upstream Windows ROCm wheel DLL install fixes onto
`release/2.14` (scikit-build-core backend): `aotriton_v2.dll` +
`liblzma.dll` (pytorch#200931) and `libomp140.x86_64.dll`
(pytorch#191629). Without them, once TheRock's temporary
force-includes are removed the DLLs drop out of the wheel and `import
torch` fails with WinError 126.

The aotriton/liblzma install uses `OPTIONAL` so the existence check runs
at install time, because aotriton's ExternalProject only generates those
DLLs during the build.

### Validation
https://github.com/ROCm/TheRock/actions/runs/38930228545 built this
branch's head (`268bf8ed4be`) with ROCm/TheRock#9058 (aotriton/liblzma
force-include removed), so those DLLs could only ship via the install
rule. Build and the `import torch` sanity check passed.

Related PR:
- pytorch#191629: install `libomp140.x86_64.dll` via CMake
- pytorch#200931: install `aotriton_v2.dll` + `liblzma.dll` via
CMake
- ROCm/TheRock#9055: drop the `_rocm_init.py` wheel force-include
- ROCm/TheRock#9058: drop the `aotriton_v2.dll` + `liblzma.dll` wheel
force-includes
- ROCm/TheRock#9360: drop the `libomp140.x86_64.dll` wheel force-include
- #3835: release/2.14 cherry-pick of pytorch#191629
+ pytorch#200931 (this PR)
- #3836: release/2.15 cherry-pick of pytorch#191629
+ pytorch#200931
- Issue: ROCm/TheRock#6965

Tracked in AIPYTORCH-1516.
jeffdaily pushed a commit to ROCm/pytorch that referenced this pull request Oct 20, 2026
… libomp140 (#3836)

Cherry-picks the two upstream Windows ROCm wheel DLL install fixes onto
`release/2.15` (scikit-build-core backend): `aotriton_v2.dll` +
`liblzma.dll` (pytorch#200931) and `libomp140.x86_64.dll`
(pytorch#191629). Without them, once TheRock's temporary
force-includes are removed the DLLs drop out of the wheel and `import
torch` fails with WinError 126.

The aotriton/liblzma install uses `OPTIONAL` so the existence check runs
at install time, because aotriton's ExternalProject only generates those
DLLs during the build.

### Validation
Branch merged with current `release/2.15` (now includes
`related_commits` from #3816). Windows ROCm wheel build
(gfx1100, py3.12) on this head (`a119523c5bc`) with ROCm/TheRock#9360,
which passes no force-include flags, so every DLL can only ship via
CMake install: https://github.com/ROCm/TheRock/actions/runs/39287495719.
Build and the `import torch` sanity check passed.

Related PR:
- pytorch#191629: install `libomp140.x86_64.dll` via CMake
- pytorch#200931: install `aotriton_v2.dll` + `liblzma.dll` via
CMake
- ROCm/TheRock#9055: drop the `_rocm_init.py` wheel force-include
- ROCm/TheRock#9058: drop the `aotriton_v2.dll` + `liblzma.dll` wheel
force-includes
- ROCm/TheRock#9360: drop the `libomp140.x86_64.dll` wheel force-include
- #3835: release/2.14 cherry-pick of pytorch#191629
+ pytorch#200931
- #3836: release/2.15 cherry-pick of pytorch#191629
+ pytorch#200931 (this PR)
- Issue: ROCm/TheRock#6965

Tracked in AIPYTORCH-1516.
jithunnair-amd pushed a commit to ROCm/pytorch that referenced this pull request Nov 4, 2026
… libomp140 (#3836)

Cherry-picks the two upstream Windows ROCm wheel DLL install fixes onto
`release/2.15` (scikit-build-core backend): `aotriton_v2.dll` +
`liblzma.dll` (pytorch#200931) and `libomp140.x86_64.dll`
(pytorch#191629). Without them, once TheRock's temporary
force-includes are removed the DLLs drop out of the wheel and `import
torch` fails with WinError 126.

The aotriton/liblzma install uses `OPTIONAL` so the existence check runs
at install time, because aotriton's ExternalProject only generates those
DLLs during the build.

### Validation
Branch merged with current `release/2.15` (now includes
`related_commits` from #3816). Windows ROCm wheel build
(gfx1100, py3.12) on this head (`a119523c5bc`) with ROCm/TheRock#9360,
which passes no force-include flags, so every DLL can only ship via
CMake install: https://github.com/ROCm/TheRock/actions/runs/39287495719.
Build and the `import torch` sanity check passed.

Related PR:
- pytorch#191629: install `libomp140.x86_64.dll` via CMake
- pytorch#200931: install `aotriton_v2.dll` + `liblzma.dll` via
CMake
- ROCm/TheRock#9055: drop the `_rocm_init.py` wheel force-include
- ROCm/TheRock#9058: drop the `aotriton_v2.dll` + `liblzma.dll` wheel
force-includes
- ROCm/TheRock#9360: drop the `libomp140.x86_64.dll` wheel force-include
- #3835: release/2.14 cherry-pick of pytorch#191629
+ pytorch#200931
- #3836: release/2.15 cherry-pick of pytorch#191629
+ pytorch#200931 (this PR)
- Issue: ROCm/TheRock#6965

Tracked in AIPYTORCH-1516.

This branch was previously deployed

1 inactive deployment
bedrock — ad841247 Deployed Oct 15, 2026 by ethanwee1
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[Issue] PyTorch nightly builds are missing _rocm_init.py. Windows fails to load c10_hip.dll, Linux fails to load libMIOpen.so.1

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