[PGO] Provide Pre-Generated Profiles

Feature or enhancement

PGO (Profile-Guided Optimization) offers significant performance benefits for Python. However, the current approach has a drawback: it makes the builds non-reproducible.

This issue could be resolved if upstream provided pre-generated profiles (perhaps via CI pipelines). These profiles could then be included in the distributed tarball, similar to how Chromium handles it. By doing so, distributions wouldn't need to:

1. Compile the source code twice.
2. Perform profiling themselves.
   In addition to streamlining the process for maintainers, this would also help maintain package reproducibility—a key consideration for many distributions.

I am not sure, about the integration with GCC, since in my testing the compilation failed with a preset profile (but I didnt dig deeper into this yet.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

ファイル、テスト、エントリポイントは特定されていません。まず、CPython の PGO ビルドと CI パイプラインを調査し、特に GCC がプリセットプロファイルをどのように利用するかを確認してください。CI で再現可能なプロファイルを生成し、下流でのプロファイリングや 2 回目のコンパイルを必要とせずに、配布用 tarball に含められれば完了です。