[issue46663] test_math test_cmath test_complex fails on Fedora Rawhide buildbots

[STINNER Victor]

STINNER Victor  added the comment:

Rawhide buildbots are back to green: GCC has been fixed, I close the issue.

Moreover, Python 3.11 now uses NAN constant or __builtin_nan("").

--
resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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[issue46663] test_math test_cmath test_complex fails on Fedora Rawhide buildbots

[STINNER Victor]

STINNER Victor  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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[issue46663] test_math test_cmath test_complex fails on Fedora Rawhide buildbots

[Mark Dickinson]

Mark Dickinson  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?

--
nosy: +mark.dickinson

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[issue46663] test_math test_cmath test_complex fails on Fedora Rawhide buildbots

[STINNER Victor]

New submission from STINNER Victor :

PPC64LE Fedora Rawhide LTO 3.10:
https://buildbot.python.org/all/#/builders/674/builds/543

3 tests failed: test_cmath test_complex test_math

That's a GCC 12 regression: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104389

--
components: Tests
messages: 412663
nosy: vstinner
priority: normal
severity: normal
status: open
title: test_math test_cmath test_complex fails on Fedora Rawhide buildbots
versions: Python 3.10, Python 3.11, Python 3.9

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