Erwan Le Pape <lepaperw...@gmail.com> added the comment:

How would you suggest going about doing that?

Without the proposed option, the alternative is leaving the build process 
vulnerable to environment variables potentially breaking the build process by 
patching configure.ac as follows:
-PYTHON_FOR_BUILD='./$(BUILDPYTHON) -E'
+PYTHON_FOR_BUILD='PYTHONHASHSEED=0 ./$(BUILDPYTHON) -E'

Otherwise all environment variables affecting the Python interpreter would need 
to be cleared in addition to setting PYTHONHASHSEED=0.

Without these `hacks`, making build outputs to be deterministic means fixing 
marshal to essentially sort elements when dumping unordered objects. Would you 
rather see a patch going in that direction?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34686>
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