From 014f6d2d8dfd4df9baf62031430c441d94ea4b0c Mon Sep 17 00:00:00 2001
From: Eric Voskuil <eric@voskuil.org>
Date: Sun, 26 Jul 2026 11:10:46 -0400
Subject: [PATCH] Posix memory map preclude msvc compile with MANAGE_STAGING.

---
 include/bitcoin/database/memory/mstage.hpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/bitcoin/database/memory/mstage.hpp b/include/bitcoin/database/memory/mstage.hpp
index 61c9f2d47..525bb0d47 100644
--- a/include/bitcoin/database/memory/mstage.hpp
+++ b/include/bitcoin/database/memory/mstage.hpp
@@ -25,6 +25,11 @@
     #define MANAGE_STAGING
 #endif
 
+#if defined(MANAGE_STAGING) && defined(HAVE_MSC)
+    // The native windows mapped-file behavior is the model staging emulates.
+    #error "MANAGE_STAGING is not supported on Windows."
+#endif
+
 #if defined(MANAGE_STAGING)
 
 /// Reserve inaccessible anonymous address space (MAP_FAILED on failure).