internal.h: WARN_UNUSED_RESULT

* internal.h (WARN_UNUSED_RESULT): warn unused result by gcc 3.4
  or later.

* symbol.c: declare some functions with WARN_UNUSED_RESULT.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47323 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 2 deletions

diff --git a/symbol.c b/symbol.c
index c3ce50f830..630a386eb0 100644
--- a/symbol.c
+++ b/symbol.c
@@ -103,8 +103,13 @@ Init_sym(void)
     Init_id();
 }
 
-static ID attrsetname_to_attr(VALUE name);
-static VALUE lookup_id_str(ID id);
+WARN_UNUSED_RESULT(static VALUE dsymbol_alloc(const VALUE klass, const VALUE str, rb_encoding *const enc));
+WARN_UNUSED_RESULT(static VALUE dsymbol_check(const VALUE sym));
+WARN_UNUSED_RESULT(static ID dsymbol_pindown(VALUE sym));
+WARN_UNUSED_RESULT(static ID lookup_str_id(VALUE str));
+WARN_UNUSED_RESULT(static VALUE lookup_str_sym(const VALUE str));
+WARN_UNUSED_RESULT(static VALUE lookup_id_str(ID id));
+WARN_UNUSED_RESULT(static ID attrsetname_to_attr(VALUE name));
 
 ID
 rb_id_attrset(ID id)