Add HIP build support.

[Rafa00127]

Since ggml already has hip support, so no big changes are needed, just wires it up in the top-level CMakeLists.txt.
Tested on Windows with an AMD GPU (7900 XTX).

Summary by CodeRabbit

• New Features
  • Added optional HIP backend build configuration. Users can now enable HIP support during the build process to leverage GPU acceleration on compatible AMD systems.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 3091b774-c229-4426-82e9-3099e8893a95

📥 Commits

Reviewing files that changed from the base of the PR and between 2c33261 and e193bcb.

📒 Files selected for processing (1)

• CMakeLists.txt

---

📝 Walkthrough

Walkthrough

This PR adds HIP (Heterogeneous-compute Interface for Portability) backend support to the CMake build system. A new S2_HIP option gates conditional configuration of the GGML HIP backend, integrates HIP targets into the local-patches dependency chain, and applies GGML_USE_CUDA as a compile definition for HIP-enabled builds.

Changes

HIP Backend Support

Layer / File(s)	Summary
HIP build option and target configuration CMakeLists.txt	Adds S2_HIP CMake option, conditionally enables GGML_HIP and registers ggml-hip in local-patches dependency wiring, and applies GGML_USE_CUDA compile definition to targets when HIP is enabled.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A rabbit hops through CMake's file,
Adding HIP with quantum style,
One option to compute with grace,
CUDA kernels find their place! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Add HIP build support' directly and accurately summarizes the main change in the pull request, which adds HIP backend build configuration to CMakeLists.txt.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}