[RCCL] Harden toolchain-linux.cmake

[nileshnegi]

Motivation

Improve toolchain-linux.cmake robustness

Technical Details

• Improve ROCm detection:
  • Check -DROCM_PATH cmake flag and ROCM_PATH env. flag.
  • Check user's PATH env.
  • Check for /opt/rocm as fallback.
• Add redundant checks for CXX compiler paths.
• Differentiate between DebugFast and normal Debug builds.

JIRA ID

Test Plan

Test Result

Submission Checklist

• Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

[Copilot]

Pull request overview

This PR hardens the RCCL Linux CMake toolchain by making ROCm path and compiler detection more robust and by tweaking default debug flag behavior for “DebugFast” vs regular Debug.

Changes:

• Add explicit ROCm path detection precedence (-DROCM_PATH > $ROCM_PATH > /opt/rocm) and fail fast if the path doesn’t exist.
• Add compiler auto-detection fallbacks under ${ROCM_PATH}/bin and ${ROCM_PATH}/llvm/bin, respecting -DCMAKE_{C,CXX}_COMPILER and $CC/$CXX.
• Adjust default Debug flags to differentiate “DebugFast” from normal Debug.

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[math-ci]

regression-detection smoke (multi-node) on commit 3ad9128

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[math-ci]

regression-detection smoke (single-node) on commit 3ad9128

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[math-ci]

regression-detection smoke (multi-node) on commit 41c3e27

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[math-ci]

regression-detection smoke (single-node) on commit 41c3e27

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[math-ci]

regression-detection smoke (multi-node) on commit 41c3e27

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[math-ci]

regression-detection smoke (multi-node) on commit 3a42096

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[math-ci]

regression-detection smoke (single-node) on commit 3a42096

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[math-ci]

regression-detection smoke (multi-node) on commit feda0e3

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[math-ci]

regression-detection smoke (single-node) on commit feda0e3

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[math-ci]

regression-detection smoke (single-node) on commit 447e410

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[math-ci]

regression-detection smoke (multi-node) on commit 447e410

Artifacts - Results