Make configure prefer python3 to plain python.
This avoids possibly selecting Python 2.x on systems that have both Python 2 and Python 3. We used to feel that what "python" links to is a user choice that we should honor. However, we're about to cease support for Python 2, so users will no longer have any choice of that sort. This small change is being made ahead of the big Python-2-ectomy so that we can see how much of the buildfarm is not yet prepared for that. Systems with only Python 2 will continue to build that way, for now. Discussion: https://postgr.es/m/2872c9a0-4b0a-1354-d5f6-94d6f85ba354@enterprisedb.com
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@ -9,14 +9,12 @@
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# Look for Python and set the output variable 'PYTHON' if found,
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# fail otherwise.
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#
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# As the Python 3 transition happens and PEP 394 isn't updated, we
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# need to cater to systems that don't have unversioned "python" by
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# default. Some systems ship with "python3" by default and perhaps
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# have "python" in an optional package. Some systems only have
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# "python2" and "python3", in which case it's reasonable to prefer the
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# newer version.
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# Since we are transitioning to supporting only Python 3.x,
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# prefer python3 to plain python. If the latter exists at all,
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# it very possibly points to python2, which we don't want to
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# select unless it's the only choice.
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AC_DEFUN([PGAC_PATH_PYTHON],
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[PGAC_PATH_PROGS(PYTHON, [python python3 python2])
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[PGAC_PATH_PROGS(PYTHON, [python3 python python2])
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AC_ARG_VAR(PYTHON, [Python program])dnl
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if test x"$PYTHON" = x""; then
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AC_MSG_ERROR([Python not found])
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2
configure
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2
configure
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@ -10279,7 +10279,7 @@ fi
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if test "$with_python" = yes; then
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if test -z "$PYTHON"; then
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for ac_prog in python python3 python2
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for ac_prog in python3 python python2
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do
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# Extract the first word of "$ac_prog", so it can be a program name with args.
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set dummy $ac_prog; ac_word=$2
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@ -1875,7 +1875,7 @@ build-postgresql:
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language becomes available. See
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<xref linkend="plpython-python23"/>
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for more information. If this is not set, the following are probed
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in this order: <literal>python python3 python2</literal>.
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in this order: <literal>python3 python python2</literal>.
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</para>
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</listitem>
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</varlistentry>
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