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-Wempty-rule: diagnose empty rules without %empty

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* src/complain.h, src/complain.c (warning_empty_rule, Wempty_rule):
New warning category.
(warnings_args, warnings_types): Adjust.
* src/reader.c (grammar_rule_check): Check the empty rules are
flagged by %empty.
* tests/actions.at (Implicitly empty rule): New.
* tests/existing.at: Add expected warnings.
This commit is contained in:
Akim Demaille
2013-02-09 18:26:38 +01:00
parent 684083f065
commit f68a49ed49
6 changed files with 107 additions and 5 deletions
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src/getargs.c
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@@ -327,6 +327,7 @@ Warning categories include:\n\
`conflicts-sr' S/R conflicts (enabled by default)\n\
`conflicts-rr' R/R conflicts (enabled by default)\n\
`deprecated' obsolete constructs\n\
`empty-rule' empty rules without %empty\n\
`precedence' useless precedence and associativity\n\
`other' all other warnings (enabled by default)\n\
`all' all the warnings\n\