bpo-39432: Implement PEP-489 algorithm for non-ascii "PyInit_*" symbol names in distutils

[scoder]

Make it export the correct init symbol also on Windows.

https://bugs.python.org/issue39432

Automerge-Triggered-By: @encukou

[encukou]

Ah! I didn't know about this part of the code :(

The change looks good to me, but it would be much better to have a test ensuring that such an extension can actually be imported successfully.
Please keep the bug open for that, if you merge as is.

[miss-islington]

Thanks @scoder for the PR 🌮🎉.. I'm working now to backport this PR to: 3.8.
🐍🍒⛏🤖

[bedevere-bot]

GH-18546 is a backport of this pull request to the 3.8 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows7 SP1 3.8 has failed when building commit 5bf58ce.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/163/builds/152) and take a look at the build logs.
4. Check if the failure is related to this commit (5bf58ce) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/163/builds/152

Failed tests:

• test_distutils

Failed subtests:

• test_unicode_module_names - distutils.tests.test_build_ext.BuildExtTestCase
• test_unicode_module_names - distutils.tests.test_build_ext.ParallelBuildExtTestCase

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

389 tests OK.

10 slowest tests:

• test_multiprocessing_spawn: 2 min 17 sec
• test_tools: 2 min
• test_tokenize: 1 min 42 sec
• test_concurrent_futures: 1 min 36 sec
• test_lib2to3: 1 min 17 sec
• test_venv: 1 min 17 sec
• test_mmap: 1 min 5 sec
• test_asyncio: 1 min 1 sec
• test_io: 1 min
• test_socket: 1 min

1 test failed:
test_distutils

33 tests skipped:
test_curses test_dbm_gnu test_dbm_ndbm test_devpoll test_epoll
test_fcntl test_fork1 test_gdb test_grp test_ioctl test_kqueue
test_multiprocessing_fork test_multiprocessing_forkserver test_nis
test_openpty test_ossaudiodev test_pipes test_poll test_posix
test_pty test_pwd test_readline test_resource test_spwd
test_syslog test_threadsignals test_tix test_tk test_ttk_guionly
test_wait3 test_wait4 test_xxtestfuzz test_zipfile64

1 re-run test:
test_distutils

Total duration: 9 min 50 sec

Click to see traceback logs

Traceback (most recent call last):
  File "C:\buildbot.python.org\3.8.kloth-win64\build\lib\distutils\tests\test_build_ext.py", line 315, in test_unicode_module_names
    self.assertRegex(cmd.get_ext_filename(modules[0].name), r'foo\..*')
AssertionError: Regex didn't match: 'foo\\..*' not found in 'foo_d.cp38-win_amd64.pyd'

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Windows10 3.8 has failed when building commit 5bf58ce.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/159/builds/144) and take a look at the build logs.
4. Check if the failure is related to this commit (5bf58ce) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/159/builds/144

Failed tests:

• test_distutils

Failed subtests:

• test_unicode_module_names - distutils.tests.test_build_ext.BuildExtTestCase
• test_unicode_module_names - distutils.tests.test_build_ext.ParallelBuildExtTestCase

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

392 tests OK.

10 slowest tests:

• test_mmap: 4 min 37 sec
• test_multiprocessing_spawn: 2 min 43 sec
• test_io: 2 min 33 sec
• test_tools: 2 min 26 sec
• test_tokenize: 2 min 10 sec
• test_concurrent_futures: 1 min 45 sec
• test_lib2to3: 1 min 21 sec
• test_largefile: 1 min 13 sec
• test_asyncio: 58.2 sec
• test_capi: 50.5 sec

1 test failed:
test_distutils

30 tests skipped:
test_curses test_dbm_gnu test_dbm_ndbm test_devpoll test_epoll
test_fcntl test_fork1 test_gdb test_grp test_ioctl test_kqueue
test_multiprocessing_fork test_multiprocessing_forkserver test_nis
test_openpty test_ossaudiodev test_pipes test_poll test_posix
test_pty test_pwd test_readline test_resource test_spwd
test_syslog test_threadsignals test_wait3 test_wait4
test_xxtestfuzz test_zipfile64

1 re-run test:
test_distutils

Total duration: 12 min 44 sec

Click to see traceback logs

Traceback (most recent call last):
  File "D:\buildarea\3.8.bolen-windows10\build\lib\distutils\tests\test_build_ext.py", line 315, in test_unicode_module_names
    self.assertRegex(cmd.get_ext_filename(modules[0].name), r'foo\..*')
AssertionError: Regex didn't match: 'foo\\..*' not found in 'foo_d.cp38-win_amd64.pyd'

[encukou]

This PR is for master. The 3.8 buildbot failures should be reported against GH-18546.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot x86 Windows7 3.8 has failed when building commit 5bf58ce.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/223/builds/141) and take a look at the build logs.
4. Check if the failure is related to this commit (5bf58ce) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/223/builds/141

Failed tests:

• test_distutils

Failed subtests:

• test_unicode_module_names - distutils.tests.test_build_ext.BuildExtTestCase
• test_unicode_module_names - distutils.tests.test_build_ext.ParallelBuildExtTestCase

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

392 tests OK.

10 slowest tests:

• test_multiprocessing_spawn: 16 min 29 sec
• test_zipfile: 8 min 3 sec
• test_concurrent_futures: 6 min 21 sec
• test_tarfile: 5 min 16 sec
• test_regrtest: 3 min 50 sec
• test_venv: 3 min 23 sec
• test_lzma: 3 min 21 sec
• test_asyncio: 2 min 53 sec
• test_pickle: 2 min 24 sec
• test_lib2to3: 2 min 20 sec

1 test failed:
test_distutils

30 tests skipped:
test_curses test_dbm_gnu test_dbm_ndbm test_devpoll test_epoll
test_fcntl test_fork1 test_gdb test_grp test_ioctl test_kqueue
test_multiprocessing_fork test_multiprocessing_forkserver test_nis
test_openpty test_ossaudiodev test_pipes test_poll test_posix
test_pty test_pwd test_readline test_resource test_spwd
test_syslog test_threadsignals test_wait3 test_wait4
test_xxtestfuzz test_zipfile64

1 re-run test:
test_distutils

Total duration: 1 hour 6 min

Click to see traceback logs

Traceback (most recent call last):
  File "D:\cygwin\home\db3l\buildarea\3.8.bolen-windows7\build\lib\distutils\tests\test_build_ext.py", line 315, in test_unicode_module_names
    self.assertRegex(cmd.get_ext_filename(modules[0].name), r'foo\..*')
AssertionError: Regex didn't match: 'foo\\..*' not found in 'foo_d.cp38-win32.pyd'