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

Browse Source 
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.
This commit is contained in:
Akim Demaille
2022-08-02 08:45:25 +02:00
parent b7bdf78c18
commit a166d5450e
3 changed files with 5 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
THANKS
View File

@@ -46,8 +46,8 @@ Csaba Raduly csaba_22@yahoo.co.uk
Dagobert Michelsen dam@baltic-online.de Dagobert Michelsen dam@baltic-online.de
Daniel Frużyński daniel@poradnik-webmastera.com Daniel Frużyński daniel@poradnik-webmastera.com
Daniel Galloway dg1751@att.com Daniel Galloway dg1751@att.com
Daniela Becker daniela@lrde.epita.fr
Daniel Hagerty hag@gnu.org Daniel Hagerty hag@gnu.org
Daniela Becker daniela@lrde.epita.fr
David Barto david.barto@sparqlcity.com David Barto david.barto@sparqlcity.com
David J. MacKenzie djm@gnu.org David J. MacKenzie djm@gnu.org
David Kastrup dak@gnu.org David Kastrup dak@gnu.org
@@ -143,6 +143,7 @@ Nick Bowler nbowler@elliptictech.com
Nicolas Bedon nicolas.bedon@univ-rouen.fr Nicolas Bedon nicolas.bedon@univ-rouen.fr
Nicolas Burrus nicolas.burrus@epita.fr Nicolas Burrus nicolas.burrus@epita.fr
Nicolas Tisserand nicolas.tisserand@epita.fr Nicolas Tisserand nicolas.tisserand@epita.fr
Nikita Popov nikic@php.net
Nikki Valen nicolettavalencia.nv@gmail.com Nikki Valen nicolettavalencia.nv@gmail.com
Noah Friedman friedman@gnu.org Noah Friedman friedman@gnu.org
Odd Arild Olsen oao@fibula.no Odd Arild Olsen oao@fibula.no
@@ -170,7 +171,6 @@ Quoc Peyrot chojin@lrde.epita.fr
R Blake blakers@mac.com R Blake blakers@mac.com
Raja R Harinath harinath@cs.umn.edu Raja R Harinath harinath@cs.umn.edu
Ralf Wildenhues Ralf.Wildenhues@gmx.de Ralf Wildenhues Ralf.Wildenhues@gmx.de
Ryan dev@splintermail.com
Rich Wilson richaw@gmail.com Rich Wilson richaw@gmail.com
Richard Stallman rms@gnu.org Richard Stallman rms@gnu.org
Rici Lake ricilake@gmail.com Rici Lake ricilake@gmail.com
@@ -179,6 +179,7 @@ Rob Vermaas rob.vermaas@gmail.com
Robert Anisko anisko_r@epita.fr Robert Anisko anisko_r@epita.fr
Robert Yang liezhi.yang@windriver.com Robert Yang liezhi.yang@windriver.com
Roland Levillain roland@lrde.epita.fr Roland Levillain roland@lrde.epita.fr
Ryan dev@splintermail.com
Satya Kiran Popuri satyakiran@gmail.com Satya Kiran Popuri satyakiran@gmail.com
Sebastian Setzer sebastian.setzer.ext@siemens.com Sebastian Setzer sebastian.setzer.ext@siemens.com
Sebastien Fricker sebastien.fricker@gmail.com Sebastien Fricker sebastien.fricker@gmail.com

2
data/skeletons/lalr1.cc
View File

@@ -847,7 +847,7 @@ m4_if(b4_prefix, [yy], [],
int yylen = 0; int yylen = 0;
// Error handling. // Error handling.
int yynerrs_ = 0; int yynerrs_ YY_ATTRIBUTE_UNUSED = 0;
int yyerrstatus_ = 0; int yyerrstatus_ = 0;
/// The lookahead symbol. /// The lookahead symbol.

2
data/skeletons/yacc.c
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@@ -256,7 +256,7 @@ int yynerrs;]])])
m4_define([b4_declare_parser_state_variables], m4_define([b4_declare_parser_state_variables],
[b4_pure_if([[ [b4_pure_if([[
/* Number of syntax errors so far. */ /* 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])[; yy_state_fast_t yystate]m4_ifval([$1], [ = 0])[;
/* Number of tokens to shift before error messages enabled. */ /* Number of tokens to shift before error messages enabled. */