On 12. 04. 24 23:52, Aoife Moloney wrote:
Wiki - https://fedoraproject.org/wiki/Changes/Python_built_with_gcc_O3
Discussion.fpo -
https://discussion.fedoraproject.org/t/f41-change-proposal-python-built-with-gcc-03-self-contained/112743
This is a proposed Change for Fedora Linux.
This document represents a proposed Change. As part of the Changes
process, proposals are publicly announced in order to receive
community feedback. This proposal will only be implemented if approved
by the Fedora Engineering Steering Committee.
== Summary ==
Instead of [https://docs.fedoraproject.org/en-US/packaging-guidelines/#_compiler_flags
Fedora's default `-O2` compiler flag], we will use `-O3` to build
CPython.
This only impacts the interpreter and Python standard library, not any
3rd party extension modules built as RPM or on developer machines.
This aligns with the way Python is built upstream.
According to our performance measurements, it makes Python
significantly faster (pyperformance geometric mean: 1.04x faster).
...snip...
# Amendment: Flag for user-built extension modules
When this change was originally proposed, the expectation was that the C flags
for building Python extension modules other than modules from the Python
standard library would not be changed.
* Python extension modules built in Fedora RPM packages were built with `-O2`
before this change and would continue to be built that way (for packages other
than Python itself).
* Python extension modules built outside of Fedora RPM packages were built with
no `-O` flag before this change and would continue to be built that way.
However, after implementing the change proposal, it was accidentally changed so
the **Python extension modules built outside of Fedora RPM packages are built
with the `-O3` flag**. This was not originally intended, yet the change owners
believe we should keep it that way because it makes Fedora's Python closer to
upstream Python and because it makes Fedora more competitive with other
platforms on CIs and similar systems.
For more details, see
https://lists.fedoraproject.org/archives/list/python-devel@xxxxxxxxxxxxxxxxxxxxxxx/thread/2IXTGNASAVR3NNHKFCOIC27CMFA6RJRH/
---
I am asking FESCo to approve this amendment in https://pagure.io/fesco/issue/3260
--
Miro Hrončok
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Phone: +420777974800
Fedora Matrix: mhroncok
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