Avoid sporadic failure of test_compileall on Windows

[jkloth]

BPO	47089
Nosy	@vstinner, @jkloth, @miss-islington
PRs	bpo-47089: Avoid test_compileall failures on Windows #32037 [3.10] bpo-47089: Avoid test_compileall failures on Windows (GH-32037) #32237 [3.9] bpo-47089: Avoid test_compileall failures on Windows (GH-32037). #32240

^{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 = <Date 2022-04-02.01:41:38.127>
created_at = <Date 2022-03-21.21:34:06.347>
labels = ['tests', '3.9', '3.10', '3.11']
title = 'Avoid sporadic failure of test_compileall on Windows'
updated_at = <Date 2022-04-02.21:56:55.927>
user = 'https://github.com/jkloth'

bugs.python.org fields:

activity = <Date 2022-04-02.21:56:55.927>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2022-04-02.01:41:38.127>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2022-03-21.21:34:06.347>
creator = 'jkloth'
dependencies = []
files = []
hgrepos = []
issue_num = 47089
keywords = ['patch']
message_count = 6.0
messages = ['415711', '416504', '416519', '416527', '416528', '416597']
nosy_count = 3.0
nosy_names = ['vstinner', 'jkloth', 'miss-islington']
pr_nums = ['32037', '32237', '32240']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue47089'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[jkloth]

Testing on Windows occasionally has issues in test_compileall when running with multiple processes. This is due to other test files importing stdlib modules at the same time that compileall is doing its own testing. While not fatal (test_compileall succeeds on re-run), the transient warnings obfuscate the test results for other "real" warnings (e.g., compiler warnings) without digging into each run separately.

This can be avoided by using the PYTHONPYCACHEPREFIX functionality to compile the stdlib modules locally.

[vstinner]

New changeset 76b8a07 by Jeremy Kloth in branch 'main':
bpo-47089: Avoid test_compileall failures on Windows (GH-32037)
76b8a07

[miss-islington]

New changeset 1069d52 by Miss Islington (bot) in branch '3.10':
bpo-47089: Avoid test_compileall failures on Windows (GH-32037)
1069d52

[vstinner]

New changeset 306a93b by Jeremy Kloth in branch '3.9':
[3.9] bpo-47089: Avoid test_compileall failures on Windows (GH-32037). (GH-32240)
306a93b

[vstinner]

Thanks for this enhancement. I close the issue.

Do you know if it does fix the old bpo-37387 issue?

[vstinner]

bpo-37387 was closed as a duplicate of this issue.