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yacc: comply with recent POSIX updates: declare yyerror and yylex

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In POSIX Yacc mode, declare yyerror and yylex unless already #defined,
or if YYERROR_IS_DECLARED/YYLEX_IS_DECLARED are defined (for
consistency with Bison's YYSTYPE_IS_DECLARED/YYLTYPE_IS_DECLARED).
See <https://austingroupbugs.net/view.php?id=1388#c5220>.

* data/skeletons/c.m4 (b4_function_declare): Resurect.
(b4_lex_formals): Since we will possibly expose this prototype
in the header, take the prefix into account.
* data/skeletons/yacc.c (b4_declare_yyerror_and_yylex): New.
(b4_shared_declarations): Use it.

* tests/local.at (AT_YACC_IF): New.
When in Yacc mode, set the `yacc` Autotest keyword.
(AT_YYERROR_DECLARE(c)): Don't declare in Yacc mode,
to avoid clashes (since this signature is static).
(AT_YYERROR_DEFINE(c)): Don't define as static in Yacc mode.
* tests/regression.at (Early token definitions with --yacc): Specify
that we are in Yacc mode.
This commit is contained in:
Akim Demaille
2021-08-05 08:39:24 +02:00
parent dabde7c560
commit 3c5f73fe51
8 changed files with 95 additions and 30 deletions
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4
tests/regression.at
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@@ -87,7 +87,7 @@ AT_SETUP([Early token definitions with --yacc])
# Found in GCJ: they expect the tokens to be defined before the user
# prologue, so that they can use the token definitions in it.
AT_BISON_OPTION_PUSHDEFS
AT_BISON_OPTION_PUSHDEFS([%yacc])
# Not AT_DATA_GRAMMAR, which uses %code, which is not supported by Yacc.
AT_DATA([input.y],
@@ -112,7 +112,7 @@ exp: MY_TOKEN;
]])
AT_BISON_OPTION_POPDEFS
AT_BISON_CHECK([-y -o input.c input.y])
AT_BISON_CHECK([--yacc -o input.c input.y])
AT_COMPILE([input.o])
AT_CLEANUP