On Sat,  6 Jul 2019 13:28:42 -0300
Mauro Carvalho Chehab <mchehab+sams...@kernel.org> wrote:

> When using the automarkup extension with:
>       make pdfdocs
> 
> without passing an specific book, the code will raise an exception:
> 
>         File "/devel/v4l/docs/Documentation/sphinx/automarkup.py", line 86, 
> in auto_markup
>           node.parent.replace(node, markup_funcs(name, app, node))
>         File "/devel/v4l/docs/Documentation/sphinx/automarkup.py", line 59, 
> in markup_funcs
>           'function', target, pxref, lit_text)
>         File 
> "/devel/v4l/docs/sphinx_2.0/lib/python3.7/site-packages/sphinx/domains/c.py", 
> line 308, in resolve_xref
>           contnode, target)
>         File 
> "/devel/v4l/docs/sphinx_2.0/lib/python3.7/site-packages/sphinx/util/nodes.py",
>  line 450, in make_refnode
>           '#' + targetid)
>         File 
> "/devel/v4l/docs/sphinx_2.0/lib/python3.7/site-packages/sphinx/builders/latex/__init__.py",
>  line 159, in get_relative_uri
>           return self.get_target_uri(to, typ)
>         File 
> "/devel/v4l/docs/sphinx_2.0/lib/python3.7/site-packages/sphinx/builders/latex/__init__.py",
>  line 152, in get_target_uri
>           raise NoUri
>       sphinx.environment.NoUri
> 
> This happens because not all references will belong to a single
> PDF/LaTeX document.

Interesting.  I'd like to understand better why the HTML builder doesn't do
this...it seems like a bug in the latex builder somehow.

> Better to just ignore those than breaking Sphinx build.
> 
> Fixes: d74b0d31ddde ("Docs: An initial automarkup extension for sphinx")
> Signed-off-by: Mauro Carvalho Chehab <mchehab+sams...@kernel.org>
> ---
>  Documentation/sphinx/automarkup.py | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/sphinx/automarkup.py 
> b/Documentation/sphinx/automarkup.py
> index b300cf129869..dba14374f269 100644
> --- a/Documentation/sphinx/automarkup.py
> +++ b/Documentation/sphinx/automarkup.py
> @@ -55,8 +55,13 @@ def markup_funcs(docname, app, node):
>                                            reftype = 'function',
>                                            reftarget = target, modname = None,
>                                            classname = None)
> -            xref = cdom.resolve_xref(app.env, docname, app.builder,
> -                                     'function', target, pxref, lit_text)
> +
> +            # When building pdf documents, this may raise a NoUri exception
> +            try:
> +                xref = cdom.resolve_xref(app.env, docname, app.builder,
> +                                         'function', target, pxref, lit_text)
> +            except:
> +                xref = None

So this absolutely needs to be "except sphinx.environment.NoUri".  I have
seen catch-all "except" clauses paper over or otherwise hide too many
problems over the years; I really try to avoid ever using them.

I want to look at this problem and understand it a bit better; then I'll
probably end up applying this patch with the above tweak.

Thanks,

jon

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