test_peg_generator fails in a non-UTF-8 locale when the regrtest work dir is non-ASCII

[serhiy-storchaka]

Bug report

PythonParserTestCase.setUpClass (Lib/test/test_peg_generator/test_c_parser.py) creates a venv in the regrtest working directory — whose name has a non-ASCII suffix (os_helper.FS_NONASCII, æ on Windows) — then runs a child that prints sysconfig.get_path('platlib'). In a non-UTF-8 locale whose code page cannot encode that character (e.g. cp932 or cp1251 on Windows), the child's stdout cannot encode the path and it fails with UnicodeEncodeError:

UnicodeEncodeError: 'cp932' codec can't encode character '\xe6' in position 46: illegal multibyte sequence

The child should emit the path in UTF-8.

Linked PRs

• gh-154592: Fix test_peg_generator in non-UTF-8 locales with a non-ASCII work dir #154593
• [3.15] gh-154592: Fix test_peg_generator in non-UTF-8 locales with a non-ASCII work dir (GH-154593) #154598
• [3.14] gh-154592: Fix test_peg_generator in non-UTF-8 locales with a non-ASCII work dir (GH-154593) #154602
• [3.13] gh-154592: Fix test_peg_generator in non-UTF-8 locales with a … #154603