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Re: [bison-3.3] sideeffect to flex ?

From: Akim Demaille
Subject: Re: [bison-3.3] sideeffect to flex ?
Date: Sun, 27 Jan 2019 06:27:20 +0100

> Le 27 janv. 2019 à 04:58, Kiyoshi KANAZAWA <address@hidden> a écrit :
> Hello,
> Trying to check other OSS's after installing bison-3.3,
> and found flex-2.6.4's make ckech failes.
> This is not occur with bison-3.2.4.
> I can not distinguish which has the problem.


The NEWS reads:

*** More POSIX Yacc compatibility warnings

  More Bison specific directives are now reported with -y or -Wyacc.  This
  change was ready since the release of Bison 3.0 in September 2015.  It was
  delayed because Autoconf used to define YACC as `bison -y`, which resulted
  in numerous warnings for Bison users that use the GNU Build System.

  If you still experience that problem, either redefine YACC as `bison -o
  y.tab.c`, or pass -Wno-yacc to Bison.

The problem here is that in addition someone has added -Werror.  Flex should 
not use -y and use Bison extension at the same time.

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