New submission from STINNER Victor <[email protected]>:
Just after calling _PyRuntime_Initialize(), Py_Main() calls:
/* 754 requires that FP exceptions run in "no stop" mode by default,
* and until C vendors implement C99's ways to control FP exceptions,
* Python requires non-stop mode. Alas, some platforms enable FP
* exceptions by default. Here we disable them.
*/
#ifdef __FreeBSD__
fedisableexcept(FE_OVERFLOW);
#endif
It's done before calling Py_Initialize(). So applications embedding Python
don't call it. But "customized Python" which call the new Py_RunMain() with
Py_InititializeFromConfig() will not call it neither.
I would like to know if this setup code should be moved into Py_Initialize()?
Especially into the new PyConfig API:
https://docs.python.org/dev/c-api/init_config.html
PyConfig got 2 flags to control parameters which affect the whole process:
* configure_c_stdio
* configure_locale
What is the behavior on FreeBSD when fedisableexcept(FE_OVERFLOW) is not called?
Note: I'm not sure why this call is only needed on FreeBSD, but not on macOS,
OpenBSD or NetBSD (operating systems close to FreeBSD).
----------
components: Interpreter Core
messages: 347048
nosy: lemburg, mark.dickinson, stutzbach, vstinner
priority: normal
severity: normal
status: open
title: Should Py_Initialize() control the floating point mode?
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue37474>
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