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bpo-35537: Document posix_spawn() change in subprocess (GH-11668)
Document that subprocess.Popen no longer raise an exception on error like missing program on very specific platforms when using os.posix_spawn() is used.
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‎Doc/library/subprocess.rst‎

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@@ -567,6 +567,13 @@ functions.
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Popen destructor now emits a :exc:`ResourceWarning` warning if the child
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process is still running.
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.. versionchanged:: 3.8
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Popen can use :func:`os.posix_spawn` in some cases for better
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performance. On Windows Subsystem for Linux and QEMU User Emulation,
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Popen constructor using :func:`os.posix_spawn` no longer raise an
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exception on errors like missing program, but the child process fails
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with a non-zero :attr:`~Popen.returncode`.
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Exceptions
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^^^^^^^^^^

‎Doc/whatsnew/3.8.rst‎

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@@ -729,6 +729,12 @@ Changes in Python behavior
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Changes in the Python API
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-------------------------
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* :class:`subprocess.Popen` can now use :func:`os.posix_spawn` in some cases
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for better performance. On Windows Subsystem for Linux and QEMU User
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Emulation, Popen constructor using :func:`os.posix_spawn` no longer raise an
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exception on errors like missing program, but the child process fails with a
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non-zero :attr:`~Popen.returncode`.
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* The :meth:`imap.IMAP4.logout` method no longer ignores silently arbitrary
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exceptions.
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