Replace use of deprecated Python module distutils.sysconfig, take 2.

With Python 3.10, configure spits out warnings about the module
distutils.sysconfig being deprecated and scheduled for removal in
Python 3.12.  Change the uses in configure to use the module sysconfig
instead.  The logic stays largely the same, although we have to
rely on INCLUDEPY instead of the deprecated get_python_inc function.

Note that sysconfig exists since Python 2.7, so this moves the
minimum required version up from Python 2.6 (or 2.4, before v13).
Also, sysconfig didn't exist in Python 3.1, so the minimum 3.x
version is now 3.2.

Back-patch of commit bd233bdd8 into all supported branches.

In v10, this also includes back-patching v11's beff4bb9c, primarily
because this opinion is clearly out-of-date:

    While at it, get rid of the code's assumption that both the major and
    minor numbers contain exactly one digit.  That will foreseeably be
    broken by Python 3.10 in perhaps four or five years.  That's far enough
    out that we probably don't need to back-patch this.

Peter Eisentraut, Tom Lane, Andres Freund

Discussion: https://postgr.es/m/c74add3c-09c4-a9dd-1a03-a846e5b2fc52@enterprisedb.com

diff --git a/config/python.m4 b/config/python.m4
index d41aeb2876a4842fa48eb8cc88d57750178e3ee1..c7310ee37d3c18cf9dd84be5e5a4c827801271a5 100644 (file)
--- a/config/python.m4
+++ b/config/python.m4
@@ -37,32 +37,25 @@ 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 6; then
-  AC_MSG_ERROR([Python version $python_version is too old (version 2.6 or later is required)])
+if test "$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)])
 fi
 
-AC_MSG_CHECKING([for Python distutils module])
-if "${PYTHON}" -c 'import distutils' 2>&AS_MESSAGE_LOG_FD
+AC_MSG_CHECKING([for Python sysconfig module])
+if "${PYTHON}" -c 'import sysconfig' 2>&AS_MESSAGE_LOG_FD
 then
     AC_MSG_RESULT(yes)
 else
     AC_MSG_RESULT(no)
-    AC_MSG_ERROR([distutils module not found])
+    AC_MSG_ERROR([sysconfig module not found])
 fi
 
 AC_MSG_CHECKING([Python configuration directory])
-python_configdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"`
+python_configdir=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBPL'))))"`
 AC_MSG_RESULT([$python_configdir])
 
-AC_MSG_CHECKING([Python include directories])
-python_includespec=`${PYTHON} -c "
-import distutils.sysconfig
-a = '-I' + distutils.sysconfig.get_python_inc(False)
-b = '-I' + distutils.sysconfig.get_python_inc(True)
-if a == b:
-    print(a)
-else:
-    print(a + ' ' + b)"`
+AC_MSG_CHECKING([Python include directory])
+python_includespec=`${PYTHON} -c "import sysconfig; print('-I' + sysconfig.get_config_var('INCLUDEPY'))"`
 if test "$PORTNAME" = win32 ; then
     python_includespec=`echo $python_includespec | sed 's,[[\]],/,g'`
 fi
@@ -96,8 +89,8 @@ AC_DEFUN([PGAC_CHECK_PYTHON_EMBED_SETUP],
 [AC_REQUIRE([_PGAC_CHECK_PYTHON_DIRS])
 AC_MSG_CHECKING([how to link an embedded Python application])
 
-python_libdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBDIR'))))"`
-python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"`
+python_libdir=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBDIR'))))"`
+python_ldlibrary=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LDLIBRARY'))))"`
 
 # If LDLIBRARY exists and has a shlib extension, use it verbatim.
 ldlibrary=`echo "${python_ldlibrary}" | sed -e 's/\.so$//' -e 's/\.dll$//' -e 's/\.dylib$//' -e 's/\.sl$//'`
@@ -109,11 +102,11 @@ else
    # Otherwise, guess the base name of the shlib.
    # LDVERSION was added in Python 3.2, before that use VERSION,
    # or failing that, $python_version from _PGAC_CHECK_PYTHON_DIRS.
-   python_ldversion=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDVERSION'))))"`
+   python_ldversion=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LDVERSION'))))"`
    if test x"${python_ldversion}" != x""; then
        ldlibrary="python${python_ldversion}"
    else
-       python_version_var=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('VERSION'))))"`
+       python_version_var=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('VERSION'))))"`
        if test x"${python_version_var}" != x""; then
            ldlibrary="python${python_version_var}"
        else
@@ -173,7 +166,7 @@ PL/Python.])
 fi
 python_libspec="-L${python_libdir} -l${ldlibrary}"
 
-python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
+python_additional_libs=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
 
 AC_MSG_RESULT([${python_libspec} ${python_additional_libs}])
 

diff --git a/configure b/configure
index e2c177eb061d95259e9f986bec48b8dc1d6dccf2..9f8869cf02e59c3b1c53e0a740c4ede42a09ae0d 100755 (executable)
--- a/configure
+++ b/configure
@@ -10038,38 +10038,31 @@ 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 6; then
-  as_fn_error $? "Python version $python_version is too old (version 2.6 or later is required)" "$LINENO" 5
+if test "$python_majorversion" -lt 3 -a "$python_minorversion" -lt 7; then
+  as_fn_error $? "Python version $python_version is too old (version 2.7 or later is required)" "$LINENO" 5
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Python distutils module" >&5
-$as_echo_n "checking for Python distutils module... " >&6; }
-if "${PYTHON}" -c 'import distutils' 2>&5
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Python sysconfig module" >&5
+$as_echo_n "checking for Python sysconfig module... " >&6; }
+if "${PYTHON}" -c 'import sysconfig' 2>&5
 then
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
 else
     { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
-    as_fn_error $? "distutils module not found" "$LINENO" 5
+    as_fn_error $? "sysconfig module not found" "$LINENO" 5
 fi
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking Python configuration directory" >&5
 $as_echo_n "checking Python configuration directory... " >&6; }
-python_configdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"`
+python_configdir=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBPL'))))"`
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $python_configdir" >&5
 $as_echo "$python_configdir" >&6; }
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking Python include directories" >&5
-$as_echo_n "checking Python include directories... " >&6; }
-python_includespec=`${PYTHON} -c "
-import distutils.sysconfig
-a = '-I' + distutils.sysconfig.get_python_inc(False)
-b = '-I' + distutils.sysconfig.get_python_inc(True)
-if a == b:
-    print(a)
-else:
-    print(a + ' ' + b)"`
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking Python include directory" >&5
+$as_echo_n "checking Python include directory... " >&6; }
+python_includespec=`${PYTHON} -c "import sysconfig; print('-I' + sysconfig.get_config_var('INCLUDEPY'))"`
 if test "$PORTNAME" = win32 ; then
     python_includespec=`echo $python_includespec | sed 's,[\],/,g'`
 fi
@@ -10081,8 +10074,8 @@ $as_echo "$python_includespec" >&6; }
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking how to link an embedded Python application" >&5
 $as_echo_n "checking how to link an embedded Python application... " >&6; }
 
-python_libdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBDIR'))))"`
-python_ldlibrary=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDLIBRARY'))))"`
+python_libdir=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBDIR'))))"`
+python_ldlibrary=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LDLIBRARY'))))"`
 
 # If LDLIBRARY exists and has a shlib extension, use it verbatim.
 ldlibrary=`echo "${python_ldlibrary}" | sed -e 's/\.so$//' -e 's/\.dll$//' -e 's/\.dylib$//' -e 's/\.sl$//'`
@@ -10094,11 +10087,11 @@ else
    # Otherwise, guess the base name of the shlib.
    # LDVERSION was added in Python 3.2, before that use VERSION,
    # or failing that, $python_version from _PGAC_CHECK_PYTHON_DIRS.
-   python_ldversion=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LDVERSION'))))"`
+   python_ldversion=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LDVERSION'))))"`
    if test x"${python_ldversion}" != x""; then
        ldlibrary="python${python_ldversion}"
    else
-       python_version_var=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('VERSION'))))"`
+       python_version_var=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('VERSION'))))"`
        if test x"${python_version_var}" != x""; then
            ldlibrary="python${python_version_var}"
        else
@@ -10158,7 +10151,7 @@ PL/Python." "$LINENO" 5
 fi
 python_libspec="-L${python_libdir} -l${ldlibrary}"
 
-python_additional_libs=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
+python_additional_libs=`${PYTHON} -c "import sysconfig; print(' '.join(filter(None,sysconfig.get_config_vars('LIBS','LIBC','LIBM','BASEMODLIBS'))))"`
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: ${python_libspec} ${python_additional_libs}" >&5
 $as_echo "${python_libspec} ${python_additional_libs}" >&6; }

diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 8c143325448faf6df05b7c54c08f6f39623f1625..bf21e410f918247cdbdfdc7c8dd723a8efb42042 100644 (file)
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -195,10 +195,10 @@ su - postgres
       To build the PL/Python server programming
       language, you need a Python
       installation with the header files and
-      the distutils module.  The minimum
-      required version is Python 2.6.
+      the sysconfig module.  The minimum
+      required version is Python 2.7.
       Python 3 is supported if it's
-      version 3.1 or later; but see
+      version 3.2 or later; but see
       
       when using Python 3.