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diagnostics: %empty enables -Wempty-rule

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* 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.
This commit is contained in:
Akim Demaille
2013-02-16 09:23:48 +01:00
parent f68a49ed49
commit 42d101da8d
4 changed files with 35 additions and 0 deletions
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19
tests/actions.at
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@@ -84,6 +84,25 @@ AT_BISON_CHECK([-fcaret -Wempty-rule 1.y], [0], [],
^^
]])
AT_DATA_GRAMMAR([[2.y]],
[[%%
exp: a b c;
a: /* empty. */ {};
b: %empty {};
c: /* empty. */ {};
]])
AT_BISON_CHECK([-fcaret 2.y], [0], [],
[[2.y:11.17-18: warning: empty rule without %empty [-Wempty-rule]
a: /* empty. */ {};
^^
2.y:13.17-18: warning: empty rule without %empty [-Wempty-rule]
c: /* empty. */ {};
^^
]])
AT_BISON_CHECK([-fcaret -Wno-empty-rule 2.y], [0])
AT_CLEANUP
## ------------------------ ##