• Takenobu Tani's avatar
    configure: Add checking python3-sphinx · 97f9674b
    Takenobu Tani authored
    This checks the configuration about python3-sphinx.
    We need python3-sphinx instead of python2-sphinx to build documentation.
    
    The approach is as follows:
    * Check python3 version with custom `conf.py` invoked from
      sphinx-build` executable
    * Place custom `conf.py` into new `utils/check-sphinx` directory
    
    If sphinx is for python2 not python3, it's treated as config ERROR
    instead of WARN.
    
    See also #17346 and #17356.
    97f9674b
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