Akim Demaille 42d101da8d diagnostics: %empty enables -Wempty-rule ...

* src/complain.h, src/complain.c (warning_is_unset): New.
* src/reader.c (grammar_current_rule_empty_set): If enabled -Wempty-rule,
if not disabled.
* tests/actions.at (Implicitly empty rule): Check this feature.
Also check that -Wno-empty-rule does disable this warning.

2013-02-18 10:01:28 +01:00

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