STINNER Victor <vstin...@python.org> added the comment:

> @vstinner What was the change that caused the buildbots to start failing? Did 
> the GCC version get updated on those machines between the last runs and this 
> one, or was the change due to recent PRs in Python?

It's a GCC regression. GCC is updated frequently on the Rawhide buildbots.

It's unrelated to Python. It's just that Python uses (Py_HUGE_VAL * 0.) for 
Py_NAN and this code is impacted by the bug.

But I wrote https://github.com/python/cpython/pull/31134 since GCC 12 will no 
longer compute (Py_HUGE_VAL * 0.) during the compilation: it will be computed 
at runtime.

See also https://bugzilla.redhat.com/show_bug.cgi?id=2050736 for details.

--

The GCC regression is fixed in gcc-12.0.1-0.6.fc36 package. It will be deployed 
on buildbots shortly (and automatically).

----------

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