Temporarily add some information about python include paths to configure.

We're still (see e0e567a106, e0e567a106) working on replacing use of the
deprecated distutils. This commit just makes configure print out the results
of different ways of determining the include path. Hopefully this will help us
to find a way to transition away from distutils without turning the buildfarm
red for prolonged amounts of time.

Discussion: https://postgr.es/m/20220124025301.qu36x44w6m67cnap@alap3.anarazel.de

config/python.m4

@@ -68,6 +68,27 @@ if test "$PORTNAME" = win32 ; then
 fi
 AC_MSG_RESULT([$python_includespec])
 
+python_ways=`${PYTHON} -c "
+import distutils.sysconfig as ds
+import os
+import sysconfig as s
+print('ds.get_python_inc(False): %s' % ds.get_python_inc(False))
+print('s path include: %s' % s.get_path('include'))
+print('ds.get_python_inc(True): %s' % ds.get_python_inc(True))
+print('s path platinclude: %s' % s.get_path('platinclude'))
+print('ds var INCLUDEPY: %s' % ds.get_config_var('INCLUDEPY'))
+print('s var INCLUDEPY: %s' % s.get_config_var('INCLUDEPY'))
+print('ds var CONFINCLUDEPY: %s' % ds.get_config_var('CONFINCLUDEPY'))
+print('s var CONFINCLUDEPY: %s' % s.get_config_var('CONFINCLUDEPY'))
+print('')
+print('ds get_python_inc(False)/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_python_inc(False), 'Python.h')))
+print('ds get_python_inc(True)/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_python_inc(True), 'Python.h')))
+print('s var INCLUDEPY/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_config_var('INCLUDEPY'), 'Python.h')))
+print('s var CONFINCLUDEPY/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_config_var('CONFINCLUDEPY'), 'Python.h')))
+"` 2>/dev/null
+AC_MSG_NOTICE([python include paths, different approaches:
+$python_ways])
+
 AC_SUBST(python_majorversion)[]dnl
 AC_SUBST(python_version)[]dnl
 AC_SUBST(python_includespec)[]dnl

configure

@@ -10383,6 +10383,29 @@ fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $python_includespec" >&5
 $as_echo "$python_includespec" >&6; }
 
+python_ways=`${PYTHON} -c "
+import distutils.sysconfig as ds
+import os
+import sysconfig as s
+print('ds.get_python_inc(False): %s' % ds.get_python_inc(False))
+print('s path include: %s' % s.get_path('include'))
+print('ds.get_python_inc(True): %s' % ds.get_python_inc(True))
+print('s path platinclude: %s' % s.get_path('platinclude'))
+print('ds var INCLUDEPY: %s' % ds.get_config_var('INCLUDEPY'))
+print('s var INCLUDEPY: %s' % s.get_config_var('INCLUDEPY'))
+print('ds var CONFINCLUDEPY: %s' % ds.get_config_var('CONFINCLUDEPY'))
+print('s var CONFINCLUDEPY: %s' % s.get_config_var('CONFINCLUDEPY'))
+print('')
+print('ds get_python_inc(False)/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_python_inc(False), 'Python.h')))
+print('ds get_python_inc(True)/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_python_inc(True), 'Python.h')))
+print('s var INCLUDEPY/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_config_var('INCLUDEPY'), 'Python.h')))
+print('s var CONFINCLUDEPY/Python.h exists: %s' % os.path.exists(os.path.join(ds.get_config_var('CONFINCLUDEPY'), 'Python.h')))
+"` 2>/dev/null
+{ $as_echo "$as_me:${as_lineno-$LINENO}: python include paths, different approaches:
+$python_ways" >&5
+$as_echo "$as_me: python include paths, different approaches:
+$python_ways" >&6;}
+
 
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking how to link an embedded Python application" >&5