Reduce R to a dummy package, upgrade rpy2 to 3.4.5 #34268
Description
We reduce the unmaintained r package (stuck at 3.6.3) so that we detect a system installation of R (>= 3.5) but do not attempt to install it ourselves.
When R is found as a system package, rpy2 will be built; otherwise it won't.
rpy2 3.5.x only supports R >= 4.0 according to
https://rpy2.github.io/doc/v3.5.x/html/overview.html#requirements
Here we upgrade rpy2 to 3.4.5, the latest that still supports R >= 3.5 according to https://rpy2.github.io/doc/v3.4.x/html/overview.html#requirements
Support for R < 3.5 was already dropped in the rpy 3.3.x series (our current version of rpy2 is 3.3.6).
According to https://repology.org/project/r/versions, we will thus drop support for R on the ancient platforms:
ubuntu-trusty(R 3.0.2; past End of Standard Support; EOL April 2024]),ubuntu-xenial(R 3.2.3; past End of Standard Support; EOL April 2026),ubuntu-bionic(R 3.4.4; End of Standard Support: April 2023)debian-stretch(R 3.3.3; past EOL)fedora-26(R 3.4.4; past EOL),
as well as on Cygwin. (See Meta-ticket: Remove support for outdated distros #32074)
Depends on #34193
CC: @EmmanuelCharpentier @videlec @dimpase @isuruf @jhpalmieri @novoselt @williamstein
Component: packages: standard
Author: Matthias Koeppe
Branch/Commit: a50460e
Reviewer: John Palmieri
Issue created by migration from https://trac.sagemath.org/ticket/34268