https://git.ruby-lang.org/ruby.git/commit/?id=b6d0b3dfaf

From b6d0b3dfaf5de60d9afacd18fcc9292973d1023a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 25 Oct 2020 22:09:56 +0900
Subject: Use gcc-specific pragma only on gcc (and the family)


diff --git a/spec/ruby/optional/capi/ext/thread_spec.c b/spec/ruby/optional/capi/ext/thread_spec.c
index 11379bb..d69c463 100644
--- a/spec/ruby/optional/capi/ext/thread_spec.c
+++ b/spec/ruby/optional/capi/ext/thread_spec.c
@@ -19,7 +19,9 @@ static VALUE thread_spec_rb_thread_alone(VALUE self) { https://github.com/ruby/ruby/blob/trunk/spec/ruby/optional/capi/ext/thread_spec.c#L19
   return rb_thread_alone() ? Qtrue : Qfalse;
 }
 
+#if defined(__GNUC__)
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
 
 /* This is unblocked by unblock_func(). */
 static void* blocking_gvl_func(void* data) {
-- 
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