From ca32e1c25908866b277f5332bb308f23de54e187 Mon Sep 17 00:00:00 2001
From: "Niall Douglas (s [underscore] sourceforge {at} nedprod [dot] com)"
 <spamtrap@nedprod.com>
Date: Thu, 16 Sep 2021 17:08:59 +0100
Subject: Fix last two commits by using volatile to prevent dead store
 elimination.

---
 include/llfio/v2.0/detail/impl/map_handle.ipp | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/include/llfio/v2.0/detail/impl/map_handle.ipp b/include/llfio/v2.0/detail/impl/map_handle.ipp
index 46fc46c8..e03587a7 100644
--- a/include/llfio/v2.0/detail/impl/map_handle.ipp
+++ b/include/llfio/v2.0/detail/impl/map_handle.ipp
@@ -173,8 +173,24 @@ namespace detail
   };
   extern inline QUICKCPPLIB_SYMBOL_VISIBLE map_handle_cache_t *map_handle_cache()
   {
-    static auto v = std::make_unique<map_handle_cache_t>();
-    return v.get();
+    static struct _
+    {
+      map_handle_cache_t *v;
+      _()
+          : v(new map_handle_cache_t)
+      {
+      }
+      ~_()
+      {
+        if(v != nullptr)
+        {
+          auto *r = v;
+          *(volatile map_handle_cache_t **) &v = nullptr;
+          delete r;
+        }
+      }
+    } v;
+    return v.v;
   }
 }  // namespace detail
 
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