From 7cd37f60cfde3ada0ed2e23409c3379e72cc3769 Mon Sep 17 00:00:00 2001
From: Richard Copley <Richard.Copley@uhb.nhs.uk>
Date: Wed, 11 Mar 2026 09:53:04 +0000
Subject: [PATCH] Only forward declare '_mm_pause' if it is used

---
 include/stdexec/stop_token.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/stdexec/stop_token.hpp b/include/stdexec/stop_token.hpp
index 5d39e69b2..23b92e993 100644
--- a/include/stdexec/stop_token.hpp
+++ b/include/stdexec/stop_token.hpp
@@ -29,7 +29,9 @@
 #  include <stop_token>  // IWYU pragma: export
 #endif
 
+#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
 extern void _mm_pause();
+#endif
 
 namespace STDEXEC::__stok
 {