https://git.ruby-lang.org/ruby.git/commit/?id=63297c2ca4

From 63297c2ca494661bdf5536a3c5d3a1c8d68d2d64 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 24 Sep 2021 10:05:17 +0900
Subject: Align the implementation precedences with `rb_atomic_t` definition

On MinGW, where both of Win32 API and GCC built-ins are available,
the mismatch of implementations to the definition caused lots of
warnings.
---
 include/ruby/atomic.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/ruby/atomic.h b/include/ruby/atomic.h
index 07aa10c..3eb80fb 100644
--- a/include/ruby/atomic.h
+++ b/include/ruby/atomic.h
@@ -430,6 +430,9 @@ rbimpl_atomic_inc(volatile rb_atomic_t *ptr) https://github.com/ruby/ruby/blob/trunk/include/ruby/atomic.h#L430
 {
 #if 0
 
+#elif defined(HAVE_GCC_ATOMIC_BUILTINS) || defined(HAVE_GCC_SYNC_BUILTINS)
+    rbimpl_atomic_add(ptr, 1);
+
 #elif defined(_WIN32)
     InterlockedIncrement(ptr);
 
@@ -450,6 +453,9 @@ rbimpl_atomic_size_inc(volatile size_t *ptr) https://github.com/ruby/ruby/blob/trunk/include/ruby/atomic.h#L453
 {
 #if 0
 
+#elif defined(HAVE_GCC_ATOMIC_BUILTINS) || defined(HAVE_GCC_SYNC_BUILTINS)
+    rbimpl_atomic_size_add(ptr, 1);
+
 #elif defined(_WIN32) && defined(_M_AMD64)
     InterlockedIncrement64(ptr);
 
@@ -558,6 +564,9 @@ rbimpl_atomic_dec(volatile rb_atomic_t *ptr) https://github.com/ruby/ruby/blob/trunk/include/ruby/atomic.h#L564
 {
 #if 0
 
+#elif defined(HAVE_GCC_ATOMIC_BUILTINS) || defined(HAVE_GCC_SYNC_BUILTINS)
+    rbimpl_atomic_sub(ptr, 1);
+
 #elif defined(_WIN32)
     InterlockedDecrement(ptr);
 
@@ -578,6 +587,9 @@ rbimpl_atomic_size_dec(volatile size_t *ptr) https://github.com/ruby/ruby/blob/trunk/include/ruby/atomic.h#L587
 {
 #if 0
 
+#elif defined(HAVE_GCC_ATOMIC_BUILTINS) || defined(HAVE_GCC_SYNC_BUILTINS)
+    rbimpl_atomic_size_sub(ptr, 1);
+
 #elif defined(_WIN32) && defined(_M_AMD64)
     InterlockedDecrement64(ptr);
 
-- 
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