From 33e8b19ea428dde3b748d93bb6a64499936df968 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Sat, 8 May 2021 15:27:57 +0300
Subject: [PATCH] mdbx-windows: check `_WIN32_WINNT` definition.

Related to https://github.com/erthink/libmdbx/issues/155

Change-Id: I49c294bd0fa055026b742a12a6f6ea9cd805cf02
---
 mdbx.h     | 7 ++++++-
 src/osal.h | 5 +++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/mdbx.h b/mdbx.h
index b2f95c8d..c1ffa7a7 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -616,7 +616,12 @@ extern LIBMDBX_VERINFO_API const struct MDBX_build_info {
  * So, if you doubt, just build MDBX as the separate DLL and don't worry. */
 
 #ifndef MDBX_CONFIG_MANUAL_TLS_CALLBACK
-#if defined(_WIN32_WINNT_VISTA) && WINVER >= _WIN32_WINNT_VISTA
+#ifndef _WIN32_WINNT
+#error Non-dll build libmdbx requires target Windows version \
+  to be explicitly defined via _WIN32_WINNT for properly \
+  handling thread local storage destructors.
+#endif
+#if _WIN32_WINNT >= 0x0600 /* Windows Vista */
 /* As described above mdbx_dll_handler() is NOT needed forWindows Vista
  * and later. */
 #define MDBX_CONFIG_MANUAL_TLS_CALLBACK 0
diff --git a/src/osal.h b/src/osal.h
index b7c476f2..8021fb78 100644
--- a/src/osal.h
+++ b/src/osal.h
@@ -143,6 +143,11 @@ __extern_C key_t ftok(const char *, int);
 #endif /* SunOS/Solaris */
 
 #if defined(_WIN32) || defined(_WIN64)
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT 0x0601 /* Windows 7 */
+#elif _WIN32_WINNT < 0x0500
+#error At least 'Windows 2000' API is required for libmdbx.
+#endif /* _WIN32_WINNT */
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif /* WIN32_LEAN_AND_MEAN */