[make] Could not import extension mathdef (exception: cannot import name 'latex_visit_math')

[Huxpro]

spec/document
λ make all
touch _build/.nojekyll
cp -f index.html _build/
(cd core; make BUILDDIR=_build all)
sphinx-build -b latex -d _build/doctrees -D latex_paper_size=a4  . _build/latex
Running Sphinx v2.2.0

Extension error:
Could not import extension mathdef (exception: cannot import name 'latex_visit_math')
make[1]: *** [latexpdf] Error 2
make: *** [build-core] Error 2

I could find the mathdef.py file under the repo https://github.com/WebAssembly/funclets/blob/master/document/core/util/mathdef.py but not sure how to fix this.

[rossberg]

Hm, sphinx.ext.mathbase, where this function is imported from, has been deprecated in Sphinx 1.8 (last September). But it's not scheduled for removal before v3, so I don't know what the issue is. Maybe they screwed it up with the recent v2 release. Can you try downgrading to 1.7 or 1.8?

Other than that, happy to take patches for upgrading to newer Sphinx versions. :)

[Huxpro]

@rossberg thanks! apparently v1.7 works for me (although v1.8 still complained the same thing).

[rossberg]

I filed an issue against Sphinx: sphinx-doc/sphinx#6708