[Samba] running ./configure on older python

[Michael Tokarev]

Hi!

I tried to build current samba on older system - this time it is a debian buster.
And ./configure fails while trying to verify if python is working:

-----------------------------------------------------------------------------------------------
Checking for python version >= 3.6.0
3.7.3
['python3.7', '-c', "\ntry:\n\tfrom distutils.sysconfig import get_config_var, get_python_lib\nexcept ImportError:\n\tfrom sysconfig import 
get_config_var, get_path\n\tdef get_python_lib(*k, **kw):\n\t\tkeyword='platlib' if kw.get('plat_specific') else 'purelib'\n\t\tif 'prefix' in 
kw:\n\t\t\treturn get_path(keyword, vars={'installed_base': kw['prefix'], 'platbase': kw['prefix']})\n\t\treturn 
get_path(keyword)\n\nprint(repr(get_config_var('prefix') or ''))\nprint(repr(get_config_var('SO') or ''))\nprint(repr(get_config_var('EXT_SUFFIX') or 
''))\nprint(repr(get_config_var('LDFLAGS') or ''))\nprint(repr(get_config_var('LIBDIR') or ''))\nprint(repr(get_config_var('LIBPL') or 
''))\nprint(repr(get_config_var('INCLUDEPY') or ''))\nprint(repr(get_config_var('Py_ENABLE_SHARED') or 
''))\nprint(repr(get_config_var('MACOSX_DEPLOYMENT_TARGET') or ''))\nprint(repr(get_config_var('LDSHARED') or 
''))\nprint(repr(get_config_var('CFLAGS') or ''))\nprint(repr(get_config_var('LDVERSION') or ''))"]
err: Traceback (most recent call last):
   File "<string>", line 12, in <module>
   File "/usr/lib/python3.7/distutils/sysconfig.py", line 571, in get_config_var
     return get_config_vars().get(name)
   File "/usr/lib/python3.7/distutils/sysconfig.py", line 503, in get_config_vars
     func()
   File "/usr/lib/python3.7/distutils/sysconfig.py", line 463, in _init_posix
     _temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
ModuleNotFoundError: No module named '_sysconfigdata__linux_x86_64-linux-gnu'

from /build/pkg/talloc-2.4.1/bld/python3.7: Could not run ['python3.7']


The interesting thing is that this code, when run from a file, Just Works:

$ echo -e "\ntry:\n\tfrom distutils.sysconfig import get_config_var.....') or ''))" > t.py
$ cat t.py

try:
	from distutils.sysconfig import get_config_var, get_python_lib
except ImportError:
	from sysconfig import get_config_var, get_path
	def get_python_lib(*k, **kw):
		keyword='platlib' if kw.get('plat_specific') else 'purelib'
		if 'prefix' in kw:
			return get_path(keyword, vars={'installed_base': kw['prefix'], 'platbase': kw['prefix']})
		return get_path(keyword)

print(repr(get_config_var('prefix') or ''))
print(repr(get_config_var('SO') or ''))
print(repr(get_config_var('EXT_SUFFIX') or ''))
print(repr(get_config_var('LDFLAGS') or ''))
print(repr(get_config_var('LIBDIR') or ''))
print(repr(get_config_var('LIBPL') or ''))
print(repr(get_config_var('INCLUDEPY') or ''))
print(repr(get_config_var('Py_ENABLE_SHARED') or ''))
print(repr(get_config_var('MACOSX_DEPLOYMENT_TARGET') or ''))
print(repr(get_config_var('LDSHARED') or ''))
print(repr(get_config_var('CFLAGS') or ''))
print(repr(get_config_var('LDVERSION') or ''))

$ python3.7 t.py
'/usr'
t.py:13: DeprecationWarning: SO is deprecated, use EXT_SUFFIX
   print(repr(get_config_var('SO') or ''))
'.cpython-37m-x86_64-linux-gnu.so'
'.cpython-37m-x86_64-linux-gnu.so'
' -Wl,-z,relro'
'/usr/lib'
'/usr/lib/python3.7/config-3.7m-x86_64-linux-gnu'
'/usr/include/python3.7m'
1
''
'x86_64-linux-gnu-gcc -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions  -Wl,-z,relro'
'-Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g   -fstack-protector-strong -Wformat -Werror=format-security  -g -flto 
-fuse-linker-plugin -ffat-lto-objects'
'3.7m'

I don't know python. What's going on there?

Thanks,

/mjt