diff --git a/ChangeLog b/ChangeLog
index 78dd070c78..89c596c999 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun May  8 08:31:03 2016  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* configure.in: add -Wsuggest-attribute=noreturn and suppress warnings.
+
 Sun May  8 08:19:16 2016  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* configure.in: add -Werror=implicit-int to avoid missing type of
diff --git a/configure.in b/configure.in
index 319f3f8a6d..846df591d7 100644
--- a/configure.in
+++ b/configure.in
@@ -835,6 +835,7 @@ if test "$GCC:${warnflags+set}:no" = yes::no; then
 		 -Werror=division-by-zero \
 		 -Werror=deprecated-declarations \
 		 -Wno-packed-bitfield-compat \
+		 -Wsuggest-attribute=noreturn \
 		 $extra_warning \
 		 ; do
 	if test "$particular_werror_flags" != yes; then
diff --git a/dmydln.c b/dmydln.c
index 25872efc98..0fc0a5325e 100644
--- a/dmydln.c
+++ b/dmydln.c
@@ -1,5 +1,6 @@
 #include "ruby/ruby.h"
 
+NORETURN(void *dln_load(const char *));
 void*
 dln_load(const char *file)
 {
diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index e6f893ecdd..20d98cfc3c 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -249,9 +249,9 @@ PRINTF_ARGS(NORETURN(void rb_loaderror_with_path(VALUE path, const char*, ...)),
 PRINTF_ARGS(NORETURN(void rb_name_error(ID, const char*, ...)), 2, 3);
 PRINTF_ARGS(NORETURN(void rb_name_error_str(VALUE, const char*, ...)), 2, 3);
 NORETURN(void rb_invalid_str(const char*, const char*));
-DEPRECATED(PRINTF_ARGS(void rb_compile_error(const char*, int, const char*, ...), 3, 4));
-DEPRECATED(PRINTF_ARGS(void rb_compile_error_with_enc(const char*, int, void *, const char*, ...), 4, 5));
-DEPRECATED(PRINTF_ARGS(void rb_compile_error_append(const char*, ...), 1, 2));
+NORETURN(DEPRECATED(PRINTF_ARGS(void rb_compile_error(const char*, int, const char*, ...), 3, 4)));
+NORETURN(DEPRECATED(PRINTF_ARGS(void rb_compile_error_with_enc(const char*, int, void *, const char*, ...), 4, 5)));
+NORETURN(DEPRECATED(PRINTF_ARGS(void rb_compile_error_append(const char*, ...), 1, 2)));
 NORETURN(void rb_error_frozen(const char*));
 NORETURN(void rb_error_frozen_object(VALUE));
 void rb_error_untrusted(VALUE);
@@ -367,12 +367,12 @@ typedef fd_set rb_fdset_t;
 
 NORETURN(void rb_exc_raise(VALUE));
 NORETURN(void rb_exc_fatal(VALUE));
-VALUE rb_f_exit(int, const VALUE*);
-VALUE rb_f_abort(int, const VALUE*);
+NORETURN(VALUE rb_f_exit(int, const VALUE*));
+NORETURN(VALUE rb_f_abort(int, const VALUE*));
 void rb_remove_method(VALUE, const char*);
 void rb_remove_method_id(VALUE, ID);
-DEPRECATED(static inline void rb_disable_super(void));
-DEPRECATED(static inline void rb_enable_super(void));
+NORETURN(DEPRECATED(static inline void rb_disable_super(void)));
+NORETURN(DEPRECATED(static inline void rb_enable_super(void)));
 static inline void rb_disable_super(void)
 {
     /* obsolete - no use */
@@ -388,7 +388,7 @@ typedef VALUE (*rb_alloc_func_t)(VALUE);
 void rb_define_alloc_func(VALUE, rb_alloc_func_t);
 void rb_undef_alloc_func(VALUE);
 rb_alloc_func_t rb_get_alloc_func(VALUE);
-DEPRECATED(void rb_clear_cache(void));
+NORETURN(DEPRECATED(void rb_clear_cache(void)));
 void rb_clear_constant_cache(void);
 void rb_clear_method_cache_by_class(VALUE);
 void rb_alias(VALUE, ID, ID);
@@ -398,12 +398,12 @@ int rb_method_basic_definition_p(VALUE, ID);
 VALUE rb_eval_cmd(VALUE, VALUE, int);
 int rb_obj_respond_to(VALUE, ID, int);
 int rb_respond_to(VALUE, ID);
-VALUE rb_f_notimplement(int argc, const VALUE *argv, VALUE obj);
+NORETURN(VALUE rb_f_notimplement(int argc, const VALUE *argv, VALUE obj));
 #if !defined(RUBY_EXPORT) && defined(_WIN32)
 RUBY_EXTERN VALUE (*const rb_f_notimplement_)(int, const VALUE *, VALUE);
 #define rb_f_notimplement (*rb_f_notimplement_)
 #endif
-void rb_interrupt(void);
+NORETURN(void rb_interrupt(void));
 VALUE rb_apply(VALUE, ID, VALUE);
 void rb_backtrace(void);
 ID rb_frame_this_func(void);
@@ -638,7 +638,7 @@ void rb_lastline_set(VALUE);
 void rb_last_status_set(int status, rb_pid_t pid);
 VALUE rb_last_status_get(void);
 int rb_proc_exec(const char*);
-VALUE rb_f_exec(int, const VALUE*);
+NORETURN(VALUE rb_f_exec(int, const VALUE*));
 rb_pid_t rb_waitpid(rb_pid_t pid, int *status, int flags);
 void rb_syswait(rb_pid_t pid);
 rb_pid_t rb_spawn(int, const VALUE*);
@@ -776,8 +776,8 @@ VALUE rb_str_replace(VALUE, VALUE);
 VALUE rb_str_inspect(VALUE);
 VALUE rb_str_dump(VALUE);
 VALUE rb_str_split(VALUE, const char*);
-DEPRECATED(void rb_str_associate(VALUE, VALUE));
-DEPRECATED(VALUE rb_str_associated(VALUE));
+NORETURN(DEPRECATED(void rb_str_associate(VALUE, VALUE)));
+NORETURN(DEPRECATED(VALUE rb_str_associated(VALUE)));
 void rb_str_setter(VALUE, ID, VALUE*);
 VALUE rb_str_intern(VALUE);
 VALUE rb_sym_to_s(VALUE);
@@ -965,7 +965,7 @@ VALUE rb_const_get_at(VALUE, ID);
 VALUE rb_const_get_from(VALUE, ID);
 void rb_const_set(VALUE, ID, VALUE);
 VALUE rb_const_remove(VALUE, ID);
-VALUE rb_mod_const_missing(VALUE,VALUE);
+NORETURN(VALUE rb_mod_const_missing(VALUE,VALUE));
 VALUE rb_cvar_defined(VALUE, ID);
 void rb_cvar_set(VALUE, ID, VALUE);
 VALUE rb_cvar_get(VALUE, ID);
@@ -983,7 +983,7 @@ VALUE rb_make_backtrace(void);
 VALUE rb_make_exception(int, const VALUE*);
 
 /* deprecated */
-DEPRECATED(void rb_frame_pop(void));
+NORETURN(DEPRECATED(void rb_frame_pop(void)));
 
 
 RUBY_SYMBOL_EXPORT_END
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index ef6caa1163..9fc7c68e63 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1715,7 +1715,7 @@ VALUE rb_gvar_var_getter(ID id, void *data, struct rb_global_variable *gvar);
 void  rb_gvar_var_setter(VALUE val, ID id, void *data, struct rb_global_variable *gvar);
 void  rb_gvar_var_marker(VALUE *var);
 
-void  rb_gvar_readonly_setter(VALUE val, ID id, void *data, struct rb_global_variable *gvar);
+NORETURN(void  rb_gvar_readonly_setter(VALUE val, ID id, void *data, struct rb_global_variable *gvar));
 
 void rb_define_variable(const char*,VALUE*);
 void rb_define_virtual_variable(const char*,VALUE(*)(ANYARGS),void(*)(ANYARGS));
diff --git a/numeric.c b/numeric.c
index 3075f8974a..574112faae 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2684,7 +2684,8 @@ rb_fix2int(VALUE val)
 }
 #endif
 
-void
+NORETURN(static void rb_out_of_short(SIGNED_VALUE num));
+static void
 rb_out_of_short(SIGNED_VALUE num)
 {
     rb_raise(rb_eRangeError, "integer %"PRIdVALUE " too %s to convert to `short'",
diff --git a/process.c b/process.c
index 75f51c8a76..980d78fda0 100644
--- a/process.c
+++ b/process.c
@@ -2584,7 +2584,7 @@ rb_f_exec(int argc, const VALUE *argv)
     rb_exec_fail(eargp, err, errmsg);
     RB_GC_GUARD(execarg_obj);
     rb_syserr_fail_str(err, fail_str);
-    return Qnil;		/* dummy */
+    UNREACHABLE;
 }
 
 #define ERRMSG(str) do { if (errmsg && 0 < errmsg_buflen) strlcpy(errmsg, (str), errmsg_buflen); } while (0)
diff --git a/thread.c b/thread.c
index 884bb01298..536783f15d 100644
--- a/thread.c
+++ b/thread.c
@@ -2117,6 +2117,7 @@ rb_threadptr_signal_exit(rb_thread_t *th)
 #define USE_SIGALTSTACK
 #endif
 
+NORETURN(void ruby_thread_stack_overflow(rb_thread_t *th));
 void
 ruby_thread_stack_overflow(rb_thread_t *th)
 {