Python type lookup broken when C domain is used

[lazka]

Describe the bug

The pycairo docs build has started to fail after some recent sphinx upgrade: https://travis-ci.org/pygobject/pycairo/jobs/543179784#L938

To Reproduce

conf.py:

extensions = ['sphinx.ext.intersphinx']
intersphinx_mapping = {'python': ('https://docs.python.org/3', None)}

index.rst:

.. c:function:: cfoo()

.. function:: foo()

    :param float bar: :class:`float`

python3 -m sphinx -b html -n . _build

Expected output: No warnings

Actual output:

index.rst:5: WARNING: py:type reference target not found: float

Using:

• Python 3.7.3
• Sphinx 2.1.1

[lazka]

It works with 2.0.1 and is broken with 2.1.0

[lazka]

Bisected to a990f9f

[tk0miya]

Sorry for inconvenience. Will be fixed by #6192

[lazka]

Thanks!

[lazka]

btw, did you reference the wrong PR? That's the one causing the issue :)

[lazka]

ok, #6482, I can confirm that that fixes my issue.

[tk0miya]

oh, sorry.

[tk0miya]

Fixed by #6478.
Thank you for reporting.