Re: [PATCH] configure.ac: fix complaint by automake of missing AC_PROG_YACC

[Wouter Verhelst <w@uter.be>]

Hi Luis,

On Thu, Aug 26, 2021 at 12:37:27PM -0700, Luis Chamberlain wrote:
> If automake sees you have a Yacc source but YACC is undefined
> it will complain.
> 
> Makefile.am: error: Yacc source seen but 'YACC' is undefined
> Makefile.am:   The usual way to define 'YACC' is to add 'AC_PROG_YACC'
> Makefile.am:   to 'configure.ac' and run 'autoconf' again.
> autoreconf: automake failed with exit status:
> 
> The recommended way to resolve this is to use AC_PROG_YACC on configure.ac,
> but that is only if we care for yacc. Since we clearly are not fans of
> it and seem to prefer bison, add the missing m4 helper which defines
> AX_PROG_BISON().

We already have that? It assumes you have the "autoconf-archive"
library[1] of m4 macros installed, though.

[1] https://www.gnu.org/software/autoconf-archive/, or as packaged in
most distributions.

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