https://git.ruby-lang.org/ruby.git/commit/?id=99e067eac6

From 99e067eac6fd2babcdd56142493ef0396744af85 Mon Sep 17 00:00:00 2001
From: Benoit Daloze <eregontp@g...>
Date: Sun, 25 Oct 2020 11:42:20 +0100
Subject: Try to fix compilation on MSVC


diff --git a/spec/ruby/optional/capi/ext/thread_spec.c b/spec/ruby/optional/capi/ext/thread_spec.c
index 53eae45..845c022 100644
--- a/spec/ruby/optional/capi/ext/thread_spec.c
+++ b/spec/ruby/optional/capi/ext/thread_spec.c
@@ -73,13 +73,19 @@ static void* blocking_gvl_func_for_udf_io(void *data) { https://github.com/ruby/ruby/blob/trunk/spec/ruby/optional/capi/ext/thread_spec.c#L73
   }
 }
 
+#if defined(__GNUC__) || defined(__clang__)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wcast-function-type"
+#endif
+
 static VALUE thread_spec_rb_thread_call_without_gvl_native_function(VALUE self) {
   pid_t ret = (pid_t) (long) rb_thread_call_without_gvl((void *(*)(void *)) getpid, 0, RUBY_UBF_IO, 0);
   return LONG2FIX(ret);
 }
+
+#if defined(__GNUC__) || defined(__clang__)
 #pragma GCC diagnostic pop
+#endif
 
 /* Returns true if the thread is interrupted. */
 static VALUE thread_spec_rb_thread_call_without_gvl_with_ubf_io(VALUE self) {
-- 
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