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Thanks for the PR, @xrisk, and the heads up, @matrixise. I will review and test this PR soon.

I have made the requested changes; please review again

I am not sure if I should also be committing the changed configure file. It is quite a large diff for me; maybe because I am using autoconf 2.71 and not 2.69.

Secondly, in my testing I never hit this code path because the script incorrectly detects that I am using gcc, when I am not. I have filed an issue on the bpo about this https://bugs.python.org/issue44093

Lastly, is there some way to detect if the built binary actually uses LTO?

cc @serge-sans-paille

PR #26341 was merged instead.