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DOC: clarify that COVERAGE_START_PROCESS needs to be set in child processes with patch=subprocess #2075

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DOC: clarify that COVERAGE_START_PROCESS needs to be set in child processes with patch=subprocess #2075

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5 changes: 2 additions & 3 deletions doc/config.rst
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Expand Up @@ -460,9 +460,8 @@ Available patches:
This patch configures Python to start coverage automatically, and will apply
to processes created with :mod:`subprocess`, :func:`os.system`, or one of the
:func:`execv <python:os.execl>` or :func:`spawnv <python:os.spawnl>` family
of functions. If an ``exec*e`` or ``spawn*e`` function is used, the new
environment must copy over the ``COVERAGE_PROCESS_START`` environment
variable.
of functions. The ``COVERAGE_PROCESS_START`` value must be copied from the
current environment into the new environment or set.

The ``subprocess`` patch sets :ref:`parallel = True <config_run_parallel>`
and will require combining data files before reporting. See
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