Greptile Summary

This PR adds a new Clang CI job for linux-x64 by extending the existing reusable workflow (03-macos-linux-build.yml) with an optional compiler input (defaulting to gcc) and wiring up a new build-and-test-linux-x64-clang job in the pipeline orchestrator.

Key changes:

• New compiler workflow input (gcc | clang) with a default of gcc, keeping all existing callers unaffected.
• Conditional apt-get install clang step and CC/CXX environment variable injection when compiler == 'clang'.
• A diagnostic lscpu step added for all Linux runners.
• New build-and-test-linux-x64-clang job in 01-ci-pipeline.yml targeting ubuntu-24.04.

Issue found:

• The Install Clang step conditions only on inputs.compiler == 'clang' without also checking runner.os == 'Linux'. Because apt-get does not exist on macOS and macOS runners already include Apple Clang, the step would fail if this workflow is ever invoked with compiler: clang against a macOS runner. The immediately following Print CPU info step correctly uses runner.os == 'Linux' as a guard.

Confidence Score: 4/5

• Safe to merge for the current use-case (Linux-only Clang job), but contains a latent bug that could break macOS builds if the reusable workflow is later called with compiler: clang on a macOS runner.
• The changes are small, well-scoped, and the new job only targets ubuntu-24.04, so there is no immediate breakage. However, the missing runner.os == 'Linux' guard on the Install Clang step is a real forward-compatibility issue that is trivial to fix now before it causes a hard failure later.
• 03-macos-linux-build.yml — the Install Clang step needs an additional OS guard.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[01-ci-pipeline.yml\nMain Workflow Trigger] --> B[lint job]
    B --> C[build-and-test-macos-arm64\ncompiler: gcc default]
    B --> D[build-and-test-linux-arm64\ncompiler: gcc default]
    B --> E[build-and-test-linux-x64\ncompiler: gcc default]
    B --> F[build-and-test-linux-x64-clang\ncompiler: clang ⭐ NEW]
    B --> G[build-android]

    C --> H[03-macos-linux-build.yml]
    D --> H
    E --> H
    F --> H

    H --> I{inputs.compiler == 'clang'}
    I -- Yes --> J[apt-get install clang\n⚠️ no runner.os guard]
    I -- No --> K[skip install]
    J --> L[Set CC=clang CXX=clang++]
    K --> M[CC/CXX unchanged]
    L --> N[Build & Test]
    M --> N

_{Last reviewed commit: "add clang ci"}

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