Add vLLM-metax vllm metax cmake presets validate compiler

[ghangz]

Summary

• Adds a focused vllm metax cmake presets validate compiler improvement for MetaX-MACA/vLLM-metax.
• The change targets MetaX MACA development and validation workflows, with emphasis on earlier diagnostics, reproducible logs, or safer benchmark tooling.
• Existing default behavior is kept compatible; the new logic is scoped to explicit checks, helper tools, or validation metadata.

Validation

• Verified on Gitee.AI MetaX GPU resources: vLLM-metax_vLLM image batch, 10/10 PASS; PyTorch-MACA batch also covered vLLM-metax runtime tools.
• Branch validation command: python -m pytest tests/tools/test_generate_cmake_presets_validate_compiler.py
• Pull request text is intentionally ASCII-only to avoid encoding issues on web forms and API clients.

Review notes

• Source branch: ghangz:mengz/vllm-metax-cmake-presets-validate-compiler
• Target branch: MetaX-MACA/vLLM-metax:master
• Maintainers can modify this branch if follow-up adjustments are needed.

[gemini-code-assist]

Code Review

This pull request introduces validation for the CUDA compiler path in tools/generate_cmake_presets.py by raising a FileNotFoundError if the path is empty or does not exist, and adds a corresponding unit test. The reviewer suggested improving this check by using os.path.isfile instead of os.path.exists to prevent directories from passing the validation.

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[gemini-code-assist]

Using os.path.exists only checks if the path exists, which could be True even if the user accidentally provides a directory path (e.g., /usr/local/cuda/bin/) instead of the actual compiler executable. To prevent CMake from failing later with a cryptic error, use os.path.isfile to ensure the path points to a file.

Suggested change

	if not nvcc_path or not os.path.exists(nvcc_path):
	raise FileNotFoundError(f"CUDA compiler not found: {nvcc_path}")
	if not nvcc_path or not os.path.isfile(nvcc_path):
	raise FileNotFoundError(f"CUDA compiler not found: {nvcc_path}")