https://git.ruby-lang.org/ruby.git/commit/?id=9195ed18ca

From 9195ed18cacb0d448c818d2a80db105d8b3cea3c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Tue, 29 Oct 2019 16:05:39 +0900
Subject: Revert "Check for nonnull attribute in configure"

This reverts commit 54eb51d72bc43f90b595f0d7ffb5069ebf1a56d9.

Windows build failure. See also https://github.com/ruby/ruby/runs/278718805

diff --git a/configure.ac b/configure.ac
index 67ce5f9..653f3bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1495,11 +1495,6 @@ 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 5b9b9b6..c296a99 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;
 };
-RUBY_FUNC_EXPORTED
-RUBY_FUNC_NONNULL(1, VALUE rb_funcallv_with_cc(struct rb_call_data*, VALUE, ID, int, const VALUE*));
-
-#ifdef __GNUC__
+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)))
 # 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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