[sr #110266] Revert regression in Yacc support, and add Bison support

[Bruno Haible]

URL:
  <https://savannah.gnu.org/support/?110266>

                 Summary: Revert regression in Yacc support, and add Bison
support
                 Project: Autoconf
            Submitted by: haible
            Submitted on: Tue 14 Jul 2020 09:47:21 PM CEST
                Category: None
                Priority: 5 - Normal
                Severity: 4 - Important
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: None

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Details:

As explained in
https://lists.gnu.org/archive/html/bug-autoconf/2018-12/msg00001.html, the
AC_PROG_YACC macro, which did support Yacc well in 2.69, now is buggy.

The change
https://git.savannah.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=42761668c0300afa7f8bf5ba736458a818cd5d15
should better be reverted and instead a new macro AC_PROG_BISON should be
added, for proper Bison support.

Akim Demaille, the original author of said change, approved the plan in
https://lists.gnu.org/archive/html/bug-autoconf/2018-12/msg00002.html .




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