[CUDAExtension] Refactor the CUDA architecture flag retrieval function

[ooooo-create]

PR Category

Execute Infrastructure

PR Types

Improvements

Description

之前 Paddle 自定义算子机制适配 dlink 的时候调用了 prepare_unix_cudaflags 来处理 cuda_arch_flags 的逻辑，但是里面调用的 get_cuda_arch_flags 是历史遗留原因写一个 todo, 返回了空列表，导致 nvcc dlink 阶段没有指定 cuda arch

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Pull request overview

This PR refactors the CUDA architecture flag retrieval functionality by relocating the _get_cuda_arch_flags function from cpp_extension.py to extension_utils.py, where it is more logically placed alongside other CUDA-related utility functions.

Key changes:

• Moved _get_cuda_arch_flags function from cpp_extension.py to extension_utils.py
• Removed redundant CUDA architecture parsing logic from normalize_extension_kwargs function
• Updated imports: removed unused copy from extension_utils.py, removed unused warnings and collections from cpp_extension.py, added paddle import to extension_utils.py

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
python/paddle/utils/cpp_extension/extension_utils.py	Adds _get_cuda_arch_flags function implementation with CUDA architecture detection logic; removes copy import; adds paddle import; updates function calls to use _get_cuda_arch_flags; removes duplicate architecture parsing code from normalize_extension_kwargs
python/paddle/utils/cpp_extension/cpp_extension.py	Removes _get_cuda_arch_flags function and its unused imports (warnings, collections)
python/paddle/utils/cpp_extension/init.py	Updates export to import _get_cuda_arch_flags from extension_utils instead of cpp_extension

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 78.43137% with 11 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (develop@7800d7e). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...thon/paddle/utils/cpp_extension/extension_utils.py	78.43%	11 Missing ⚠️

❌ Your patch status has failed because the patch coverage (78.43%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             develop   #77216   +/-   ##
==========================================
  Coverage           ?   78.43%           
==========================================
  Files              ?        1           
  Lines              ?       51           
  Branches           ?        0           
==========================================
  Hits               ?       40           
  Misses             ?       11           
  Partials           ?        0           

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[ooooo-create]

/skip-ci coverage 自定义算子流程在覆盖率中采集不到