Re: [PATCH v2 0/7] Macros for Asciidoctor support

> There are two major processors of AsciiDoc: AsciiDoc itself, and Asciidoctor.
> Both have advantages and disadvantages, but traditionally the documentation has
> been built with AsciiDoc, leading to some surprising breakage when building with
> Asciidoctor.  Partially, this is due to the need to specify a significant number
> of macros on the command line when building with Asciidoctor.
>
> This series cleans up some issues building the documentation with Asciidoctor
> and provides two knobs, USE_ASCIIDOCTOR, which controls building with
> Asciidoctor, and ASCIIDOCTOR_EXTENSIONS_LAB, which controls the location of the
> Asciidoctor Extensions Lab, which is necessary to expand the linkgit macro.
>
> The need for the extensions could be replaced with a small amount of Ruby code,
> if that's considered desirable.  Previous opinions on doing so were negative,
> however.
>
> In the process, I found several issues with cat-texi.perl, which have been
> fixed.  It has also been modernized to use strict, warnings, and lexical file
> handles.  I also made an attempt to produce more diffable texi files; I may
> follow up with additional series along this line to make the documentation build
> reproducibly.