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yacc: declare yyerror/yylex only when POSIXLY_CORRECT

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The recent changes to comply with POSIX are breaking Automake's test
suite.
Reported by Kiyoshi Kanazawa.
<https://lists.gnu.org/r/bug-bison/2021-09/msg00005.html>

To limit the impact of POSIX changes, bind them to $POSIXLY_CORRECT.
Suggested by Karl Berry.
<https://lists.gnu.org/r/bug-bison/2021-09/msg00009.html>

The existing `maintainer-check-posix` Make target checks these
changes.

* src/getargs.h, src/getargs.c (set_yacc): New.
Use it.
* data/skeletons/bison.m4 (b4_posix_if): New.
* data/skeletons/yacc.c (b4_declare_yyerror_and_yylex): Use it.
* doc/bison.texi, tests/local.at: Adjust.
This commit is contained in:
Akim Demaille
2021-09-10 06:48:02 +02:00
parent ad9b8a069f
commit 5d9ccd5a87
11 changed files with 53 additions and 16 deletions
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data/skeletons/bison.m4
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@@ -1110,6 +1110,7 @@ b4_percent_define_if_define([token_ctor], [api.token.constructor])
b4_percent_define_if_define([locations]) # Whether locations are tracked.
b4_percent_define_if_define([parse.assert])
b4_percent_define_if_define([parse.trace])
b4_percent_define_if_define([posix])
# b4_bison_locations_if([IF-TRUE])