make htmldocs fails with Sphinx 3

Heinrich Schuchardt xypron.glpk at
Fri Aug 21 05:13:54 CEST 2020

As described in

the kernel build system for 'make htmldocs' fails with Sphinx 3. A patch
is not yet available.

Extension error:
Could not import extension cdomain (exception: cannot import name
'c_funcptr_sig_re' from ''

The same can be seen in U-Boot.

Downgrading to Sphinx 2 helps but is not a permanent solution.

The latest Sphinx 2 Debian packages are here:

Best regards


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