[PATCH 06/12] diagnostics: %empty enables -Wempty-rule

[Akim Demaille]

* 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.
---
 src/complain.c   |  9 +++++++++
 src/complain.h   |  3 +++
 src/reader.c     |  4 ++++
 tests/actions.at | 19 +++++++++++++++++++
 4 files changed, 35 insertions(+)

diff --git a/src/complain.c b/src/complain.c
index cdc8803..44e1b1e 100644
--- a/src/complain.c
+++ b/src/complain.c
@@ -196,6 +196,15 @@ warning_severity (warnings flags)
     }
 }
 
+bool
+warning_is_unset (warnings flags)
+{
+  size_t b;
+  for (b = 0; b < warnings_size; ++b)
+    if (flags & 1 << b && warnings_flag[b] != severity_unset)
+      return false;
+  return true;
+}
 
 /** Display a "[-Wyacc]" like message on \a f.  */
 
diff --git a/src/complain.h b/src/complain.h
index 422c48f..a433184 100644
--- a/src/complain.h
+++ b/src/complain.h
@@ -101,6 +101,9 @@ typedef enum
     Wall              = ~complaint & ~fatal & ~silent
   } warnings;
 
+/** Whether the warnings of \a flags are all unset.
+    (Never enabled, never disabled). */
+bool warning_is_unset (warnings flags);
 
 /** Make a complaint, with maybe a location.  */
 void complain (location const *loc, warnings flags, char const *message, ...)
diff --git a/src/reader.c b/src/reader.c
index 0422d20..c83fc52 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -451,6 +451,10 @@ grammar_current_rule_prec_set (symbol *precsym, location 
loc)
 void
 grammar_current_rule_empty_set (location loc)
 {
+  /* If %empty is used and -Wno-empty-rule is not, then enable
+     -Wempty-rule.  */
+  if (warning_is_unset (Wempty_rule))
+    warning_argmatch ("empty-rule", 0, 0);
   if (current_rule->percent_empty_loc.start.file)
     complain (&loc, complaint, _("only one %s allowed per rule"), "%empty");
   else
diff --git a/tests/actions.at b/tests/actions.at
index eb98bda..8e4c171 100644
--- a/tests/actions.at
+++ b/tests/actions.at
@@ -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
 
 ## ------------------------ ##
-- 
1.8.1.3