yacc.c, lalr1.cc: fix warnings about yynerrs

[Akim Demaille]

commit a166d5450e3f47587b98f6005f9f5627dbe21a5b
Author: Akim Demaille <akim.demaille@gmail.com>
Date:   Tue Aug 2 08:45:25 2022 +0200

    yacc.c, lalr1.cc: fix warnings about yynerrs
    
    Most often yynerrs is not used.  Clang 15 now complains about such
    variables.  Bison itself does not compile:
    
    ```
    src/parse-gram.c:1797:9: error: variable 'gram_nerrs' set but not used 
[-Werror,-Wunused-but-set-variable]
        int yynerrs = 0;
            ^
    src/parse-gram.c:79:25: note: expanded from macro 'yynerrs'
                            ^
    1 error generated.
    ```
    
    Reported by Nikita Popov.
    Fixes https://github.com/akimd/bison/issues/89.
    
    * data/skeletons/yacc.c (yynerrs): Flag with YY_ATTRIBUTE_UNUSED.
    * data/skeletons/lalr1.cc (yynerrs_): Likewise.

diff --git a/THANKS b/THANKS
index 8ab72096..391b847e 100644
--- a/THANKS
+++ b/THANKS
@@ -46,8 +46,8 @@ Csaba Raduly              csaba_22@yahoo.co.uk
 Dagobert Michelsen        dam@baltic-online.de
 Daniel Frużyński          daniel@poradnik-webmastera.com
 Daniel Galloway           dg1751@att.com
-Daniela Becker            daniela@lrde.epita.fr
 Daniel Hagerty            hag@gnu.org
+Daniela Becker            daniela@lrde.epita.fr
 David Barto               david.barto@sparqlcity.com
 David J. MacKenzie        djm@gnu.org
 David Kastrup             dak@gnu.org
@@ -143,6 +143,7 @@ Nick Bowler               nbowler@elliptictech.com
 Nicolas Bedon             nicolas.bedon@univ-rouen.fr
 Nicolas Burrus            nicolas.burrus@epita.fr
 Nicolas Tisserand         nicolas.tisserand@epita.fr
+Nikita Popov              nikic@php.net
 Nikki Valen               nicolettavalencia.nv@gmail.com
 Noah Friedman             friedman@gnu.org
 Odd Arild Olsen           oao@fibula.no
@@ -170,7 +171,6 @@ Quoc Peyrot               chojin@lrde.epita.fr
 R Blake                   blakers@mac.com
 Raja R Harinath           harinath@cs.umn.edu
 Ralf Wildenhues           Ralf.Wildenhues@gmx.de
-Ryan                      dev@splintermail.com
 Rich Wilson               richaw@gmail.com
 Richard Stallman          rms@gnu.org
 Rici Lake                 ricilake@gmail.com
@@ -179,6 +179,7 @@ Rob Vermaas               rob.vermaas@gmail.com
 Robert Anisko             anisko_r@epita.fr
 Robert Yang               liezhi.yang@windriver.com
 Roland Levillain          roland@lrde.epita.fr
+Ryan                      dev@splintermail.com
 Satya Kiran Popuri        satyakiran@gmail.com
 Sebastian Setzer          sebastian.setzer.ext@siemens.com
 Sebastien Fricker         sebastien.fricker@gmail.com
diff --git a/data/skeletons/lalr1.cc b/data/skeletons/lalr1.cc
index 240f4c36..4242b992 100644
--- a/data/skeletons/lalr1.cc
+++ b/data/skeletons/lalr1.cc
@@ -847,7 +847,7 @@ m4_if(b4_prefix, [yy], [],
     int yylen = 0;
 
     // Error handling.
-    int yynerrs_ = 0;
+    int yynerrs_ YY_ATTRIBUTE_UNUSED = 0;
     int yyerrstatus_ = 0;
 
     /// The lookahead symbol.
diff --git a/data/skeletons/yacc.c b/data/skeletons/yacc.c
index fd7e2c33..07a523b0 100644
--- a/data/skeletons/yacc.c
+++ b/data/skeletons/yacc.c
@@ -256,7 +256,7 @@ int yynerrs;]])])
 m4_define([b4_declare_parser_state_variables],
 [b4_pure_if([[
     /* Number of syntax errors so far.  */
-    int yynerrs]m4_ifval([$1], [ = 0])[;
+    int yynerrs YY_ATTRIBUTE_UNUSED]m4_ifval([$1], [ = 0])[;
 ]])[
     yy_state_fast_t yystate]m4_ifval([$1], [ = 0])[;
     /* Number of tokens to shift before error messages enabled.  */













commit 5555f4d05163316b8b5bddbdb172c0f5bae6f765
Author: Akim Demaille <akim.demaille@gmail.com>
Date:   Tue Aug 2 09:00:47 2022 +0200

    regen

diff --git a/src/parse-gram.c b/src/parse-gram.c
index 400e89b7..b6ac083e 100644
--- a/src/parse-gram.c
+++ b/src/parse-gram.c
@@ -1,9 +1,9 @@
-/* A Bison parser, made by GNU Bison 3.8.1.  */
+/* A Bison parser, made by GNU Bison 3.8.2.30-82269.  */
 
 /* Bison implementation for Yacc-like parsers in C
 
-   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2022 Free Software
-   Foundation, Inc.
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2022 Free Software 
Foundation,
+   Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -46,10 +46,10 @@
    USER NAME SPACE" below.  */
 
 /* Identify Bison output, and Bison version.  */
-#define YYBISON 30801
+#define YYBISON 30802
 
 /* Bison version string.  */
-#define YYBISON_VERSION "3.8.1"
+#define YYBISON_VERSION "3.8.2.30-82269"
 
 /* Skeleton name.  */
 #define YYSKELETON_NAME "yacc.c"
@@ -1794,7 +1794,7 @@ static YYLTYPE yyloc_default
 YYLTYPE yylloc = yyloc_default;
 
     /* Number of syntax errors so far.  */
-    int yynerrs = 0;
+    int yynerrs YY_ATTRIBUTE_UNUSED = 0;
 
     yy_state_fast_t yystate = 0;
     /* Number of tokens to shift before error messages enabled.  */
diff --git a/src/parse-gram.h b/src/parse-gram.h
index 55837bc4..5170e08c 100644
--- a/src/parse-gram.h
+++ b/src/parse-gram.h
@@ -1,8 +1,8 @@
-/* A Bison parser, made by GNU Bison 3.8.1.  */
+/* A Bison parser, made by GNU Bison 3.8.2.30-82269.  */
 
 /* Bison interface for Yacc-like parsers in C
 
-   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2021 Free Software 
Foundation,
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2022 Free Software 
Foundation,
    Inc.
 
    This program is free software: you can redistribute it and/or modify