https://git.ruby-lang.org/ruby.git/commit/?id=e4be2fda3d

From e4be2fda3dbbfdb1f2ace697c96cf6bdd7dfef21 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: Thu, 29 Aug 2019 15:47:33 +0900
Subject: Rule out gcc on Windows

It seems the combination fails at the moment.  Don't know exactly
why but I suspect there can be issues in resolving weak references.
Let's rule them out for now.

https://ci.appveyor.com/project/ruby/ruby/builds/27036383/job/x3c5d54839aacoyt

diff --git a/include/ruby/intern.h b/include/ruby/intern.h
index f53864d..d9ea79d 100644
--- a/include/ruby/intern.h
+++ b/include/ruby/intern.h
@@ -1171,4 +1171,19 @@ __attribute__((__unused__,__weakref__("rb_define_singleton_method"),__nonnull__( https://github.com/ruby/ruby/blob/trunk/include/ruby/intern.h#L1171
 #endif
 #endif
 
+#ifdef _WIN32
+#ifdef rb_define_method_id
+#undef rb_define_method_id
+#endif
+#ifdef rb_define_private_function
+#undef rb_define_private_function
+#endif
+#ifdef rb_define_protected_function
+#undef rb_define_protected_function
+#endif
+#ifdef rb_define_singleton_function
+#undef rb_define_singleton_function
+#endif
+#endif
+
 #endif /* RUBY_INTERN_H */
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 61fb3b0..29f7f1f 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -2818,4 +2818,16 @@ __attribute__((__unused__,__weakref__("rb_define_global_function"),__nonnull__(1 https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L2818
 #endif
 #endif
 
+#ifdef _WIN32
+#ifdef rb_define_method
+#undef rb_define_method
+#endif
+#ifdef rb_define_module_function
+#undef rb_define_module_function
+#endif
+#ifdef rb_define_global_function
+#undef rb_define_global_function
+#endif
+#endif
+
 #endif /* RUBY_RUBY_H */
-- 
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