Message 412531 - Python tracker

➜

This issue tracker has been migrated to GitHub , and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

In-reply-to
Author	vstinner
Recipients	vstinner
Date	2022年02月04日.20:24:09
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1644006249.4.0.292742084923.issue46640@roundup.psfhosted.org>

Content
While debugging a GCC regression () on "HUGE_VAL 0" used by Py_NAN macro, I noticed that Python can now C99 "NAN" constant. (*) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104389 In bpo-45440, I already removed legacy code for pre-C99 support and old platforms: "Building Python now requires a C99 <math.h> header file providing the following functions: copysign(), hypot(), isfinite(), isinf(), isnan(), round()." Attached patch modifies Py_NAN to simply reuse NAN. mathmodule.c and cmathmodule.c m_nan() still use _Py_dg_stdnan() by default (if PY_NO_SHORT_FLOAT_REPR is not defined).

Content

While debugging a GCC regression (*) on "HUGE_VAL * 0" used by Py_NAN macro, I noticed that Python can now C99 "NAN" constant.
(*) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104389
In bpo-45440, I already removed legacy code for pre-C99 support and old platforms:
"Building Python now requires a C99 <math.h> header file providing the following functions: copysign(), hypot(), isfinite(), isinf(), isnan(), round()."
Attached patch modifies Py_NAN to simply reuse NAN.
mathmodule.c and cmathmodule.c m_nan() still use _Py_dg_stdnan() by default (if PY_NO_SHORT_FLOAT_REPR is not defined).

History
Date	User	Action	Args
2022年02月04日 20:24:09	vstinner	set	recipients: + vstinner
2022年02月04日 20:24:09	vstinner	set	messageid: <1644006249.4.0.292742084923.issue46640@roundup.psfhosted.org>
2022年02月04日 20:24:09	vstinner	link	issue46640 messages
2022年02月04日 20:24:09	vstinner	create

homepage