gh-136229: Remove Platform Emscripten is not supported warning

[hoodmane]

• Issue: Remove Platform Emscripten is not supported warning #136229

[vstinner]

LGTM. Can you also update https://peps.python.org/pep-0011/#tier-3 ?

[vstinner]

By the way, https://peps.python.org/pep-0776/ is still a draft.

[blockchainGuru1018]

@hoodmane approved the pr

[emmatyping]

I think it would be better to indent the other entries more to line up with the line containing aarch64-apple-ios*-simulator/clang (so that all the PY_SUPPORT_TIER lines are aligned)

[freakboy3742]

Agreed. I'll push a change to that effect.

[freakboy3742]

By the way, https://peps.python.org/pep-0776/ is still a draft.

Noted; however, Emscripten is a bit of a weird case. WASI and Emscripten were both at Tier 3 for Py3.12, without a PEP existing at all; WASI is at Tier 2, and doesn't have a PEP. In addition, the Steering Council has approved restoration to Tier 3 for Emscripten (python/steering-council#256).

I absolutely agree that we should finalize PEP 776; but I don't personally consider it a blocker for this PR.

[miss-islington-app]

Thanks @hoodmane for the PR, and @freakboy3742 for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

[bedevere-app]

GH-136445 is a backport of this pull request to the 3.14 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot aarch64 Fedora Stable Refleaks 3.14 (tier-2) has failed when building commit e0b9f07.

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/#/builders/1710/builds/252) and take a look at the build logs.
4. Check if the failure is related to this commit (e0b9f07) 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/#/builders/1710/builds/252

Failed tests:

• test_perf_profiler
• test.test_multiprocessing_spawn.test_threads

Failed subtests:

• test_python_calls_appear_in_the_stack_if_perf_activated - test.test_perf_profiler.TestPerfProfilerWithDwarf.test_python_calls_appear_in_the_stack_if_perf_activated
• test_rapid_restart - test.test_multiprocessing_spawn.test_threads.WithThreadsTestManagerRestart.test_rapid_restart

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/test/test_perf_profiler.py", line 373, in test_python_calls_appear_in_the_stack_if_perf_activated
    self.assertEqual(stderr, "")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^
AssertionError: 'Warning:\nProcessed 1307 events and lost [35 chars]\n\n' != ''
- Warning:
- Processed 1307 events and lost 5 chunks!
- 
- Check IO/CPU overload!
- 


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/test/_test_multiprocessing.py", line 3472, in test_rapid_restart
    manager.start()
    ~~~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/managers.py", line 570, in start
    self._address = reader.recv()
                    ~~~~~~~~~~~^^
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/connection.py", line 256, in recv
    buf = self._recv_bytes()
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/connection.py", line 447, in _recv_bytes
    buf = self._recv(4)
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/connection.py", line 416, in _recv
    raise EOFError
EOFError


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/process.py", line 320, in _bootstrap
    self.run()
    ~~~~~~~~^^
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/managers.py", line 595, in _run_server
    server = cls._Server(registry, address, authkey, serializer)
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/managers.py", line 160, in __init__
    self.listener = Listener(address=address, backlog=128)
                    ~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/connection.py", line 481, in __init__
    self._listener = SocketListener(address, family, backlog)
                     ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/multiprocessing/connection.py", line 625, in __init__
    self._socket.bind(address)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^
OSError: [Errno 98] Address already in use
ERROR
Warning -- Dangling processes: {<SpawnProcess name='QueueManager-12' pid=220210 parent=188549 stopped exitcode=1>}


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.14.cstratak-fedora-stable-aarch64.refleak/build/Lib/test/test_perf_profiler.py", line 373, in test_python_calls_appear_in_the_stack_if_perf_activated
    self.assertEqual(stderr, "")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^
AssertionError: 'Warning:\nProcessed 1469 events and lost [35 chars]\n\n' != ''
- Warning:
- Processed 1469 events and lost 2 chunks!
- 
- Check IO/CPU overload!
-