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From e21d46fddd0753e66a4acda88317670fee07f3e6 Mon Sep 17 00:00:00 2001
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From: "Miro Hron\\v{c}ok" <miro@hroncok.cz>
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Date: Tue, 27 Oct 2020 14:33:46 -0700
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Subject: [PATCH] python: determine Python (3.10) version number correctly.
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This change fixes https://bugs.gnu.org/44239
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(and https://bugzilla.redhat.com/show_bug.cgi?id=1889732).
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* m4/python.m4: use print('%u.%u' % sys.version_info[:2]) for
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the version number instead of merely sys.version[:3], so the
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numbers are treated as numbers.
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* t/python-vars.sh (PYTHON_VERSION): Likewise.
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* doc/automake.texi: Document it.
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* NEWS: mention it. (Minor tweaks from Karl Berry.)
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---
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NEWS | 2 ++
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doc/automake.texi | 2 +-
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m4/python.m4 | 12 +++++++-----
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t/python-vars.sh | 4 +++-
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4 files changed, 13 insertions(+), 7 deletions(-)
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diff --git a/doc/automake.texi b/doc/automake.texi
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index ed7e2e242..17bc2dae6 100644
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--- a/doc/automake.texi
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+++ b/doc/automake.texi
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@@ -7861,7 +7861,7 @@ AM_CONDITIONAL([HAVE_PYTHON], [test "$PYTHON" != :])
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@item PYTHON_VERSION
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The Python version number, in the form @var{major}.@var{minor}
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(e.g., @samp{2.5}). This is currently the value of
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-@samp{sys.version[:3]}.
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+@samp{'%u.%u' % sys.version_info[:2]}.
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@item PYTHON_PREFIX
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The string @samp{$@{prefix@}}. This term may be used in future work
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diff --git a/m4/python.m4 b/m4/python.m4
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index 16c2f4f1a..b2302baa3 100644
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--- a/m4/python.m4
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+++ b/m4/python.m4
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@@ -1,7 +1,7 @@
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## ------------------------ -*- Autoconf -*-
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## Python file handling
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## From Andrew Dalke
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-## Updated by James Henstridge
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+## Updated by James Henstridge and other contributors.
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## ------------------------
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# Copyright (C) 1999-2020 Free Software Foundation, Inc.
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#
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@@ -86,12 +86,14 @@ AC_DEFUN([AM_PATH_PYTHON],
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m4_default([$3], [AC_MSG_ERROR([no suitable Python interpreter found])])
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else
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- dnl Query Python for its version number. Getting [:3] seems to be
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- dnl the best way to do this; it's what "site.py" does in the standard
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- dnl library.
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+ dnl Query Python for its version number. Although site.py simply uses
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+ dnl sys.version[:3], printing that failed with Python 3.10, since the
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+ dnl trailing zero was eliminated. So now we output just the major
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+ dnl and minor version numbers, as numbers. Apparently the tertiary
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+ dnl version is not of interest.
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AC_CACHE_CHECK([for $am_display_PYTHON version], [am_cv_python_version],
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- [am_cv_python_version=`$PYTHON -c "import sys; sys.stdout.write(sys.version[[:3]])"`])
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+ [am_cv_python_version=`$PYTHON -c "import sys; print('%u.%u' % sys.version_info[[:2]])"`])
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AC_SUBST([PYTHON_VERSION], [$am_cv_python_version])
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dnl Use the values of $prefix and $exec_prefix for the corresponding
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diff --git a/t/python-vars.sh b/t/python-vars.sh
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index 5c748bcf1..b53018b37 100644
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--- a/t/python-vars.sh
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+++ b/t/python-vars.sh
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@@ -28,7 +28,9 @@ CONFIG_SITE=/dev/null; export CONFIG_SITE
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# vary among different python installations, so we need more relaxed
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# and ad-hoc checks for them. Also, more proper "functional" checks
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# on them should be done in the 'python-virtualenv.sh' test.
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-PYTHON_VERSION=$($PYTHON -c 'import sys; print(sys.version[:3])') || exit 1
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+#
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+# This version identification is duplicated in python.m4 (and the manual).
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+PYTHON_VERSION=$($PYTHON -c 'import sys; print("%u.%u" % sys.version_info[:2])') || exit 1
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PYTHON_PLATFORM=$($PYTHON -c 'import sys; print(sys.platform)') || exit 1
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PYTHON_EXEC_PREFIX='${exec_prefix}'
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PYTHON_PREFIX='${prefix}'
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--
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2.29.0
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