In particular, CI is running tests on post-EOL distros.

Here we collect tickets in roughly chronological order that required special care for old platforms, as well as tickets that drop support for old platforms.

Sage 9.4:

• Drop support for optional packages with system gcc 4.x on ubuntu-trusty, debian-jessie, linuxmint-17, centos-7 #31526 (Drop support for optional packages with system gcc 4.x on ubuntu-trusty, debian-jessie, linuxmint-17, centos-7)

Sage 9.5:

• {ubuntu-trusty,linuxmint-17}-gcc_spkg: numpy, ntl, nauty, ... fail to build #32281: {ubuntu-trusty,linuxmint-17}-gcc_spkg: numpy, ntl, nauty, ... fail to build
• sage-bootstrap-python: Prefer pythons that support ssl with SNI #32405 sage-bootstrap-python: Reject ancient pythons that do not support SNI
• linuxmint-17, ubuntu-trusty: scipy build error with pybind11 #32515 linuxmint-17, ubuntu-trusty: scipy build error with pybind11
• Update singular to 4.2.1p3 #32907 Update singular to 4.2.1p2 (required patching flint for ubuntu-trusty)
• update and promote spkg primecount #25009 primecount required patching for ubuntu-trusty etc. and would require patching for debian-jessie
• tox.ini, GH Actions: Update Linux platforms #32947 Drop support for debian-jessie - gcc 4.9; past EOL LTS, extended LTS (commercial, separate from Debian, till June 2022), see https://wiki.debian.org/DebianReleases).
• GH Actions: Remove ubuntu-groovy #33068 GH Actions: Remove ubuntu-groovy

Sage 9.6:

• no changes to supported platforms
• tox / GH Actions: Add centos-7-devtoolset-gcc_{9,10,11} #32965: tox / GH Actions: Add fedora/centos variants using devtoolset
• tox / GH Actions: Add ubuntu variants using ppa:ubuntu-toolchain-r #32966: tox / GH Actions: Add ubuntu variants using ppa:ubuntu-toolchain-r

Sage 9.7:

• Drop support for GCC < 6.3 in Sage 9.7 #33316 Drop support for GCC < 6.3, motivated by stricter compiler requirements in numpy 1.22.x, scipy 1.8.x (Update numpy to 1.22.x, scipy 1.8.x, networkx 2.8.x #32423), linbox (Upgrade to givaro-4.2.0 fflas-ffpack-2.5.0 linbox-1.7.0 #32959), e-antic/Normaliz (Update Normaliz to 3.9.x, pynormaliz to 2.17, e-antic to 1.x, add optional package antic #31588):
  • ubuntu-trusty 14.04 is long past "standard support", but EOL has been extended to Apr 2024. Replace by ubuntu-trusty-toolchain-gcc_9
  • Likewise for ubuntu-xenial: replace by ubuntu-xenial-toolchain-gcc_9
  • centos-7 has EOL June 2024, gcc 4.x. Replace by centos-7-devtoolset-gcc_11
  • linuxmint-17 had EOL 2019. gcc 4.x. Drop
  • linuxmint-18 had EOL 2021, gcc 5.4. Drop
  • slackware-14.2 with gcc 5.5. Drop
• Soft drop of support for Cygwin

Sage 9.8:

• Reduce R to a dummy package, upgrade rpy2 to 3.4.5 #34268 Reduce R to a dummy package, upgrade rpy2 to 3.4.5 -- this drops support for R on ubuntu-trusty, ubuntu-xenial, ubuntu-bionic, debian-stretch, fedora-26.
• Drop support for GCC < 8 in Sage 9.8 #34266 Drop support for GCC < 8, motivated by stricter compiler requirements in scipy 1.10.x, which needs C++ 17 language support and specifically GCC >= 8 - http://scipy.github.io/devdocs/dev/toolchain.html#compilers
  • debian-stretch (EOL, GCC 6.3), fedora-{26,27,28} (GCC < 8): Drop
  • ubuntu-bionic and linuxmint-19.x: Default gcc is gcc-7, but a gcc-8 package is available, providing /usr/bin/gcc-8 but not /usr/bin/gcc. Replace platform by ubuntu-bionic-gcc_8 (to be defined)
  • opensuse-15.0: Default gcc is gcc7, but a package gcc8 is available, which provides /usr/bin/gcc-8 but not /usr/bin/gcc. Replace with opensuse-15.0-gcc_8
  • opensuse-15.3, -15.4: Default gcc is gcc7, but packages gcc8, gcc9, gcc10, gcc11 are available. Replace platforms by opensuse-15.{3,4}-gcc_11

Sage 10.0:

• No platforms dropped.
• New platforms: Support GCC 13 (fedora-38) #35092

Sage 10.1:

• New platforms: CI Linux: Update platforms #35660, tox.ini, .github/workflows/docker.yml: Add almalinux #35794
• tox.ini / GH Actions: Remove gentoo-python3.9 #35705

Sage 10.2:

• Drop support for GCC < 8.4, drop testing of debian-buster and fedora-29 #35810: NumPy 1.25.x needs GCC >= 8.4; this refers to but is stricter than the published SciPy toolchain roadmap (as of 2023-05-06).
  • debian-buster (LTS until 2024-06) only has GCC 8.3: Drop. Replace tested platform debian-buster-i386 by debian-bullseye-i386.
  • ubutu-bionic-gcc_8-python3.8 has GCC 8.4, so ok.
  • opensuse-15.0-gcc_8 only has GCC 8.2.1: Drop.
  • opensuse-15.1 and newer have gcc9, gcc10 packages or newer; check if we need to replace currently tested opensuse-15.3 by opensuse-15.3-gcc_10.
  • linuxmint-19.1-gcc_8 has GCC 8.4, so OK.
  • fedora-29 (long past EOL) only has GCC 8.3.1: Drop.
  • centos-stream-8 has GCC 8.5, ok.
• Drop support for Python 3.8 #35404 (prereq for SciPy 1.11.x)
• Fix bootstrapping on centos-7, fedora-30, ubuntu-xenial #36476

Sage 10.3

• Remove Cygwin support (https://groups.google.com/g/sage-devel/c/IusqNb9FqnQ): Remove Cygwin distro support #36778, Remove the pycygwin package #36779
• configure.ac: Remove tests for outdated platforms #36915

Sage 10.4

• Remove ubuntu-trusty (EOL 2024-04), opensuse-{15.3,15.4} (past EOL) - CI: Update Linux platforms / runners, remove ubuntu-trusty, opensuse-{15.3,15.4} #37351
• gcc, gfortran: Update to 13.2.0; remove debian-buster-gcc_spkg from CI #38008 (debian-buster LTS until 2024-06)
• tox.ini, .github/workflows, .devcontainer: Remove centos-stream-8 (EOL) #38179 (EOL 2024-05)

Sage 10.5

• CI: Remove centos-7 #38380 (EOL 2024-06)

Sage 10.x:

• Drop support for system Python on debian-bullseye (end of standard support 2024-08), ubuntu-focal (end of standard support 2025-04) - build/pkgs/python3 3.13.0rc1, require Python >= 3.10, numpy 2.1.1, scipy 1.14.1, pillow 10.4.0, cffi 1.17.0, networkx 3.3, sphinx 8, ipython 8.26 #37006
• Use and require C++17 instead of C++11 (in distro + sagelib) #37906
• sage-bootstrap: Drop support for Python 2, < 3.5; port sagemath-environment to Python >= 3.5 #35858
• Proposed: Drop support for optional packages on Linux 32bit – SPKG that only build executables or data: Replace spkg-install by conda #35583 / Install some dummy and optional packages using conda-forge (micromamba) #35585

CC: @mkoeppe

Component: build

Issue created by migration from https://trac.sagemath.org/ticket/32074