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plpython: Reject Python 2 during build configuration.

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Python 2.7 went EOL 2020-01-01 and the support for Python 2 requires a fair
bit of infrastructure. Therefore we are removing Python 2 support in plpython.

This patch just rejects Python 2 during configure / mkvcbuild.pl. Future
commits will remove the code and infrastructure for Python 2 support and
adjust more of the documentation. This way we can see the buildfarm state
after the removal sooner and we can be sure that failures are due to
desupporting Python 2, rather than caused by infrastructure cleanup.

Reviewed-By: Peter Eisentraut <peter@eisentraut.org>
Discussion: https://postgr.es/m/20211031184548.g4sxfe47n2kyi55r@alap3.anarazel.de
This commit is contained in:
Andres Freund
2022-02-16 22:47:35 -08:00
parent 8f388f6f55
commit 19252e8ec9
5 changed files with 19 additions and 20 deletions
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9
config/python.m4
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@ -9,6 +9,9 @@
# Look for Python and set the output variable 'PYTHON' if found,
# fail otherwise.
#
# Since we are supporting only Python 3.x, prefer python3 to plain python. If
# the latter exists at all, it very possibly points to python2.
# As the Python 3 transition happens and PEP 394 isn't updated, we
# need to cater to systems that don't have unversioned "python" by
# default. Some systems ship with "python3" by default and perhaps
@ -16,7 +19,7 @@
# "python2" and "python3", in which case it's reasonable to prefer the
# newer version.
AC_DEFUN([PGAC_PATH_PYTHON],
[PGAC_PATH_PROGS(PYTHON, [python python3 python2])
[PGAC_PATH_PROGS(PYTHON, [python3 python])
AC_ARG_VAR(PYTHON, [Python program])dnl
if test x"$PYTHON" = x""; then
AC_MSG_ERROR([Python not found])
@ -37,8 +40,8 @@ python_majorversion=`echo "$python_fullversion" | sed '[s/^\([0-9]*\).*/\1/]'`
python_minorversion=`echo "$python_fullversion" | sed '[s/^[0-9]*\.\([0-9]*\).*/\1/]'`
python_version=`echo "$python_fullversion" | sed '[s/^\([0-9]*\.[0-9]*\).*/\1/]'`
# Reject unsupported Python versions as soon as practical.
if test "$python_majorversion" -lt 3 -a "$python_minorversion" -lt 7; then
AC_MSG_ERROR([Python version $python_version is too old (version 2.7 or later is required)])
if test "$python_majorversion" -lt 3; then
AC_MSG_ERROR([Python version $python_version is too old (version 3 or later is required)])
fi
AC_MSG_CHECKING([for Python sysconfig module])