[PATCH 1/2] doc/Makefile: turn warnings into errors

[Tom Rini]

On Fri, Feb 21, 2020 at 04:26:36AM +0100, Heinrich Schuchardt wrote:

> Several patches delivered incorrect restructured text as documentation. We
> should be able to discover this in Travis CI or Gitlab CI.
> 
> So let us turn all build warnings into errors.
> 
> We cannot add --keep-going as Gitlab does not use sphinx-build version 1.8
> or later yet.

Why can't we upgrade sphinx-build so that we then run these builds also
in Gitlab / Azure?  Thanks!

-- 
Tom
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