bpo-31904: Only UTF-8 encoding is supported on VxWorks

[hliu0]

VxWorks uses UTF-8 as the system encoding. So the test case test_c_locale_coercion.py need to be updated to use UTF-8 on VxWorks.

https://bugs.python.org/issue31904

[vstinner]

Your doc is wrong: getpreferredencoding() isn't hardcoded to UTF-8 on VxWorks.

You have to hack Lib/_bootlocale.py and Lib/locale.py using sys.platform == "vxworks" to make this effective.

I guess that you can just replace if hasattr(sys, 'getandroidapilevel'): with if hasattr(sys, 'getandroidapilevel') and sys.platform == "vxworks":, and update the related comments.

[vstinner]

Suggested change

	argument are ignored.
	argument is ignored.

[hliu0]

"are" is used for "the locale" and "the do_setlocale argument".

This line is mostly the same as comment for Android at line 328:

On Android or in the UTF-8 mode (:option:-X utf8 option), always
return 'UTF-8', the locale and the do_setlocale argument are ignored.

[bedevere-bot]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[hliu0]

Your doc is wrong: getpreferredencoding() isn't hardcoded to UTF-8 on VxWorks.

You have to hack Lib/_bootlocale.py and Lib/locale.py using sys.platform == "vxworks" to make this effective.

I guess that you can just replace if hasattr(sys, 'getandroidapilevel'): with if hasattr(sys, 'getandroidapilevel') and sys.platform == "vxworks":, and update the related comments.

On VxWorks, always return "UTF-8" with sys.flags.utf8_mode is True in both locale.py&_bootlocale.py:
if sys.flags.utf8_mode:
return 'UTF-8'
So it does't need to add judgement with sys.platform == "vxworks".

[hliu0]

I have made the requested changes; please review again.

[bedevere-bot]

Thanks for making the requested changes!

@vstinner: please review the changes made to this pull request.

[pxinwr]

The author of this PR has quit the job. A new PR #19448 was created to replace this one. Please anyone helps to close this PR.

[corona10]

@pxinwr Thank you for letting me know