[CRIU] [PATCH v2 2/2] Documentation: Allow to use asciidoctor for formatting man pages

[Dmitry Safonov]

On Wed, 16 Jan 2019 at 16:16, Takashi Iwai <tiwai at suse.de> wrote:
>
> Since asciidoc is based on Phyton 2, we want to move to alternative,
> and a promising one is asciidoctor.  This patch allows to use
> asciidoctor for formatting man pages instead of asiidoc, by passing
> a make option, USE_ASCIIDOCTOR=yes.
>
> Although asciidoctor is almost compatible with asciidoc, it can
> produce a man page directly from a text file without XML, which is
> more efficiently.  So in asciidoctor mode, we don't require xmlto.
>
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> ---

[..]

> +ifneq ($(USE_ASCIIDOCTOR),)
> +       $(Q) $(ASCIIDOC) -b manpage -d manpage -o $@ $<
> +else
>         $(Q) $(ASCIIDOC) -b docbook -d manpage -o $(patsubst %.1,%.xml,$@) $<
>         $(Q) $(XMLTO) man -m custom.xsl $(patsubst %.1,%.xml,$@) 2>/dev/null
> +endif

Can we remove this ifneq's?
Like, can those call details go inside $(ASCIIDOC)?
And to define ASCIIDOC: if asciidoctor is installed, use it. Fallback
to asciidoc if not installed.
So, no one will need to set USE_ASCIIDOCTOR somewhere.

Thanks,
             Dmitry