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CI: Use LLVM's OpenMP over MSVC_DEBUG_non_redist on Windows (#26678)

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* CI: Use LLVM's OpenMP over MSFT_DEBUG_non_redist on Windows

Currently, we ship the non-redist debug version of microsoft's libomp.
This PR changes this to official LLVM's release, also packaging
the license as needed.

* Remove LLVM SHA from job name to increase legibility

* Add temp validations to CI

* Revert "Add temp validations to CI"

This reverts commit eef97c88b5bac280803ebb3c3b7bb09f89b0fd88.

* Build OpenMP in CI

* Make OpenMP fetch self-contained in cmake and cache in CI

* Robustify Licens-packaging

1. Ship OpenMP license, not LLVM's.
2. Invalidate cache also on checksum of the license

* Remove stale reference in docs/build.md

* No longer package base license in release

This was scope-creep

* Add explanatory comment to OpenMP license

* Remove arm64 smoke

Forgot this during conflict resolution during rebase of
c54c0e9cf6030a5a54ce8bdd81b3e146d9787d42

* Remove GGML_OPENMP_FETCH_CACHE_DIR as requested by @CISC

* whitespace changes
This commit is contained in:
Oliver Simons
2026-08-20 15:42:26 +02:00
committed by GitHub
parent 9855ad69d3
commit bf0040e15f
8 changed files with 128 additions and 9 deletions
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docs/build.md
+2 -1
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@@ -72,9 +72,10 @@ cmake --build build --config Release
- Please remember to always use a Developer Command Prompt / PowerShell for VS2022 for git, build, test
- For Windows on ARM (arm64, WoA) build with:
```bash
cmake --preset arm64-windows-llvm-release -D GGML_OPENMP=OFF
cmake --preset arm64-windows-llvm-release -D GGML_OPENMP_FETCH=ON
cmake --build build-arm64-windows-llvm-release
```
`GGML_OPENMP_FETCH` downloads the official LLVM OpenMP runtime and requires Clang, 7-Zip and network access during configuration. CMake selects the runtime from the target architecture, so this also works when cross-compiling for WoA from x64. The extracted header, import library, DLL and OpenMP license are placed under `build/_deps`. The build copies `libomp.dll` and `LICENSE-LLVM-OpenMP` to the runtime output directory and installs them together. Omit the option to use CMake's normal OpenMP detection, or pass `-D GGML_OPENMP=OFF` to disable OpenMP.
For building with ninja generator and clang compiler as default:
-set path:set LIB=C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22621.0\um\x64;C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.41.34120\lib\x64\uwp;C:\Program Files (x86)\Windows Kits\10\Lib\10.0.22621.0\ucrt\x64
```bash