From b6c425aaddd38fec6a6b6f0d816bff18bc205cfd Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 30 Aug 2014 13:29:45 +0000
Subject: [PATCH] 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
---
 internal.h | 8 ++++++++
 symbol.c   | 9 +++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/internal.h b/internal.h
index 8b9701c597..2e88324f0c 100644
--- a/internal.h
+++ b/internal.h
@@ -40,6 +40,14 @@ extern "C" {
 #define UNINITIALIZED_VAR(x) x
 #endif
 
+#if __has_attribute(warn_unused_result)
+#define WARN_UNUSED_RESULT(x) x __attribute__((warn_unused_result))
+#elif defined(__GNUC__) && (__GNUC__ * 1000 + __GNUC_MINOR__) >= 3004
+#define WARN_UNUSED_RESULT(x) x __attribute__((warn_unused_result))
+#else
+#define WARN_UNUSED_RESULT(x) x
+#endif
+
 #ifdef HAVE_VALGRIND_MEMCHECK_H
 # include <valgrind/memcheck.h>
 # ifndef VALGRIND_MAKE_MEM_DEFINED
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)