[issue30124] Fix C aliasing issue in Python/dtoa.c to use strict aliasing on Clang 4.0

[Eric V. Smith]

Eric V. Smith added the comment:

I agree we shouldn't do anything heroic to "fix" dtoa.c. I'd wait and see if Gay (or other maintainers) will chose an approach if Clang keeps this behavior.

At most, I think Mark's idea to use -fno-strict-aliasing only on dtoa.c and nowhere else would be the better approach.

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