Unable to compile 3.0b3 on Ubuntu systems: Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding

[zopyx]

BPO	41529
Nosy	@zopyx, @vstinner, @ambv, @zware

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-08-12.08:23:18.247>
labels = ['build', '3.9']
title = 'Unable to compile 3.0b3 on Ubuntu systems: Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding'
updated_at = <Date 2020-08-12.20:23:46.202>
user = 'https://github.com/zopyx'

bugs.python.org fields:

activity = <Date 2020-08-12.20:23:46.202>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Build']
creation = <Date 2020-08-12.08:23:18.247>
creator = 'ajung'
dependencies = []
files = []
hgrepos = []
issue_num = 41529
keywords = []
message_count = 3.0
messages = ['375216', '375282', '375284']
nosy_count = 4.0
nosy_names = ['ajung', 'vstinner', 'lukasz.langa', 'zach.ware']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue41529'
versions = ['Python 3.9']

[zopyx]

Building 3.9.0b3 fails on Ubuntu 19 and 20 in same way:

./python -E -S -m sysconfig --generate-posix-vars ;\
if test $? -ne 0 ; then \
echo "generate-posix-vars failed" ; \
rm -f ./pybuilddir.txt ; \
exit 1 ; \
fi
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Python path configuration:
PYTHONHOME = (not set)
PYTHONPATH = (not set)
program name = './python'
isolated = 0
environment = 0
user site = 1
import site = 0
sys._base_executable = '/home/ajung/src/pp.server/Python-3.9.0b3/python'
sys.base_prefix = '/opt/python-3.9.0b3'
sys.base_exec_prefix = '/opt/python-3.9.0b3'
sys.platlibdir = 'lib'
sys.executable = '/home/ajung/src/pp.server/Python-3.9.0b3/python'
sys.prefix = '/opt/python-3.9.0b3'
sys.exec_prefix = '/opt/python-3.9.0b3'
sys.path = [
'/opt/python-3.9.0b3/lib/python39.zip',
'/opt/python-3.9.0b3/lib/python3.9',
'/opt/python-3.9.0b3/lib/lib-dynload',
]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

Current thread 0x00007f824c25c280 (most recent call first):
<no Python frame>
generate-posix-vars failed
make: *** [Makefile:612: pybuilddir.txt] Error 1

[zware]

Can you reproduce this with the current release (3.9.0rc1)? Also, how did you call ./configure and make?

Adding Łukasz so this is on his radar in case the first answer is affirmative and there's nothing exotic in the second. For the record, I can't reproduce on Ubuntu-based Pop_OS 20.04.

[vstinner]

It seems like you're getting the error while running "make". I'm surprised by the sys.path value. Do you have a file called pybuilddir.txt in the current directory? If yes, what does it contain?

Can you please try the command:

make SHELL="bash -x"

What is your current directory? Is it '/home/ajung/src/pp.server/Python-3.9.0b?

[iritkatriel]

There was no reply to the followup questions, and 3.9 is no longer maintained, so I'm closing.