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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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5
doc/bison.texi
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@@ -11877,7 +11877,10 @@ Generate different diagnostics (it implies @option{-Wyacc}).
Generate @code{#define} statements in addition to an @code{enum} to
associate token codes with token kind names.
@item
Generate prototypes for @code{yyerror} and @code{yylex} (since Bison 3.8):
If the @code{POSIXLY_CORRECT} environment variable is defined, generate
prototypes for @code{yyerror} and @code{yylex}@footnote{See
@url{https://austingroupbugs.net/view.php?id=1388#c5220}.} (since Bison
3.8):
@example
int yylex (void);
void yyerror (const char *);