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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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2
data/skeletons/yacc.c
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@@ -367,7 +367,7 @@ m4_define([b4_declare_yyparse],
# Comply with POSIX Yacc.
# <https://austingroupbugs.net/view.php?id=1388#c5220>
m4_define([b4_declare_yyerror_and_yylex],
[b4_yacc_if([[#if !defined ]b4_prefix[error && !defined ]b4_api_PREFIX[ERROR_IS_DECLARED
[b4_posix_if([[#if !defined ]b4_prefix[error && !defined ]b4_api_PREFIX[ERROR_IS_DECLARED
]b4_function_declare([b4_prefix[error]], void, b4_yyerror_formals)[
#endif
#if !defined ]b4_prefix[lex && !defined ]b4_api_PREFIX[LEX_IS_DECLARED