[3.15] gh-158810: Fix Py_ARRAY_LENGTH() macro on C++

[vstinner]

• Issue: [C API] Py_ARRAY_LENGTH() macro is incompatible with g++ -std=gnu++11 #158810

[miss-islington-app]

Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

[miss-islington-app]

Sorry, @vstinner, I could not cleanly backport this to 3.14 due to a conflict.

Please backport manually with cherry_picker, see the devguide for more information.

cherry_picker 152185fdf81515df55925e0bebccb9000c34cb11 3.14

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot x86-64 macOS 3.15 (tier-2) has failed when building commit 152185f.

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/2031/builds/440) and take a look at the build logs.
4. Check if the failure is related to this commit (152185f) 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/2031/builds/440

Failed tests:

• test_cext

Failed subtests:

• test_build - test.test_cext.TestInteralCpp.test_build
• test_build_cpp03 - test.test_cext.TestPublicCpp.test_build_cpp03
• test_build_cpp11 - test.test_cext.TestPublicCpp.test_build_cpp11

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

==

Click to see traceback logs

Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 151, in test_build_cpp11
    self.check_build('_test_cppext_cpp11', std='c++11')
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 106, in check_build
    run_cmd('Tests', cmd)
    ~~~~~~~^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 81, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/Users/buildbot/buildarea/3.15.billenstein-macos/build/build/test_python_13579æ/tempcwd/env/bin/python.exe', '-X', 'dev', '/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/runtests.py', '_test_cppext_cpp11'] returned non-zero exit status 1.


Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 192, in test_build
    self.check_build('_test_cppext_internal')
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 106, in check_build
    run_cmd('Tests', cmd)
    ~~~~~~~^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 81, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/Users/buildbot/buildarea/3.15.billenstein-macos/build/build/test_python_13579æ/tempcwd/env/bin/python.exe', '-X', 'dev', '/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/runtests.py', '_test_cppext_internal'] returned non-zero exit status 1.


Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 147, in test_build_cpp03
    self.check_build('_test_cppext_cpp03', std='c++03')
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 106, in check_build
    run_cmd('Tests', cmd)
    ~~~~~~~^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 81, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/Users/buildbot/buildarea/3.15.billenstein-macos/build/build/test_python_13579æ/tempcwd/env/bin/python.exe', '-X', 'dev', '/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/runtests.py', '_test_cppext_cpp03'] returned non-zero exit status 1.


Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 147, in test_build_cpp03
    self.check_build('_test_cppext_cpp03', std='c++03')
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 106, in check_build
    run_cmd('Tests', cmd)
    ~~~~~~~^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/__init__.py", line 81, in run_cmd
    subprocess.run(cmd, check=True, env=env)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/subprocess.py", line 692, in run
    raise CalledProcessError(retcode, process.args,
                             output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command ['/Users/buildbot/buildarea/3.15.billenstein-macos/build/build/test_python_14639æ/tempcwd/env/bin/python.exe', '-X', 'dev', '/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/runtests.py', '_test_cppext_cpp03'] returned non-zero exit status 1.


Traceback (most recent call last):
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/runtests.py", line 68, in <module>
    main()
    ~~~~^^
  File "/Users/buildbot/buildarea/3.15.billenstein-macos/build/Lib/test/test_cext/runtests.py", line 62, in main
    raise AssertionError(f'Tests leaked {diff} references')
AssertionError: Tests leaked 1 references
ERROR