https://git.ruby-lang.org/ruby.git/commit/?id=54eb51d72b

From 54eb51d72bc43f90b595f0d7ffb5069ebf1a56d9 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 29 Oct 2019 12:12:07 +0900
Subject: Check for nonnull attribute in configure


diff --git a/configure.ac b/configure.ac
index 653f3bb..67ce5f9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1495,6 +1495,11 @@ done https://github.com/ruby/ruby/blob/trunk/configure.ac#L1495
 AS_IF([test "$rb_cv_func_exported" != no], [
     AC_DEFINE_UNQUOTED(RUBY_FUNC_EXPORTED, [$rb_cv_func_exported extern])
 ])
+RUBY_DECL_ATTRIBUTE([__nonnull__(n)], [RUBY_FUNC_NONNULL(n,x)], [rb_cv_func_nonnull],
+                    [], [function], [
+@%:@define x int conftest_attribute_check(void *p)
+@%:@define n 1
+])
 
 RUBY_APPEND_OPTION(XCFLAGS, -DRUBY_EXPORT)
 
diff --git a/internal.h b/internal.h
index c296a99..5b9b9b6 100644
--- a/internal.h
+++ b/internal.h
@@ -2387,16 +2387,16 @@ struct rb_call_data { https://github.com/ruby/ruby/blob/trunk/internal.h#L2387
     struct rb_call_cache cc;
     struct rb_call_info ci;
 };
-VALUE rb_funcallv_with_cc(struct rb_call_data*, VALUE, ID, int, const VALUE*)
-#if (defined(__clang__) || GCC_VERSION_SINCE(3, 3, 0)) && defined(__OPTIMIZE__)
-__attribute__((__visibility__("default"), __nonnull__(1)))
+RUBY_FUNC_EXPORTED
+RUBY_FUNC_NONNULL(1, VALUE rb_funcallv_with_cc(struct rb_call_data*, VALUE, ID, int, const VALUE*));
+
+#ifdef __GNUC__
 # define rb_funcallv(recv, mid, argc, argv) \
     __extension__({ \
         static struct rb_call_data rb_funcallv_data = { { 0, }, { 0, }, }; \
         rb_funcallv_with_cc(&rb_funcallv_data, recv, mid, argc, argv); \
     })
 #endif
-    ;
 
 /* miniprelude.c, prelude.c */
 void Init_prelude(void);
-- 
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