Fix #7802: autodoc: EOFError is raised on parallel build #7818
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sphinx-build has crashed with EOFError when autodoc raises a warning having exc_info under parallel mode. In parallel mode, all messages are pickled to transfer logs to parent process. But the warning is not picklable because it contains a traceback object. This removes exc_info from warning messages to prevent crashes.
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Feature or Bugfix
Purpose
sphinx-build has crashed with EOFError when autodoc raises a warning
having exc_info under parallel mode. In parallel mode, all messages
are pickled to transfer logs to parent process. But the warning is
not picklable because it contains a traceback object.
This removes exc_info from warning messages to prevent crashes.
cc: @eric-wieser
refs: #7802