From 9cdee2adb5c9bf8afc33f26e532c06205d4a16e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=9B=D0=B5=D0=BE=D0=BD=D0=B8=D0=B4=20=D0=AE=D1=80=D1=8C?=
 =?UTF-8?q?=D0=B5=D0=B2=20=28Leonid=20Yuriev=29?= <leo@yuriev.ru>
Date: Mon, 10 Oct 2022 15:52:58 +0300
Subject: [PATCH] =?UTF-8?q?mdbx-cmake:=20=D0=B4=D0=BE=D0=B1=D0=B0=D0=B2?=
 =?UTF-8?q?=D0=BB=D0=B5=D0=BD=D0=B0=20=D0=BF=D0=BE=D0=B4=D0=B4=D0=B5=D1=80?=
 =?UTF-8?q?=D0=B6=D0=BA=D0=B0=20=D0=BE=D0=BF=D1=86=D0=B8=D0=B8=20`MDBX=5FA?=
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---
 CMakeLists.txt  | 5 ++++-
 src/config.h.in | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b9155aa..a631fa78 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -494,11 +494,14 @@ if(${CMAKE_SYSTEM_NAME} STREQUAL "Windows")
   if(MDBX_NTDLL_EXTRA_IMPLIB)
     add_mdbx_option(MDBX_WITHOUT_MSVC_CRT "Avoid dependence from MSVC CRT and use ntdll.dll instead" OFF)
   endif()
+  set(MDBX_AVOID_MSYNC_DEFAULT ON)
 else()
   add_mdbx_option(MDBX_USE_OFDLOCKS "Use Open file description locks (aka OFD locks, non-POSIX)" AUTO)
   mark_as_advanced(MDBX_USE_OFDLOCKS)
+  set(MDBX_AVOID_MSYNC_DEFAULT OFF)
 endif()
-add_mdbx_option(MDBX_LOCKING "Locking method (Win32=-1, SysV=5, POSIX=1988, POSIX=2001, POSIX=2008, Futexes=1995)" AUTO)
+option(MDBX_AVOID_MSYNC "Controls dirty pages tracking, spilling and persisting in MDBX_WRITEMAP mode" ${MDBX_AVOID_MSYNC_DEFAULT})
+add_mdbx_option(MDBX_LOCKING "Locking method (Windows=-1, SysV=5, POSIX=1988, POSIX=2001, POSIX=2008, Futexes=1995)" AUTO)
 mark_as_advanced(MDBX_LOCKING)
 add_mdbx_option(MDBX_TRUST_RTC "Does a system have battery-backed Real-Time Clock or just a fake" AUTO)
 mark_as_advanced(MDBX_TRUST_RTC)
diff --git a/src/config.h.in b/src/config.h.in
index 58119c33..786a8c0b 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -27,6 +27,7 @@
 #cmakedefine01 MDBX_TRUST_RTC
 #endif
 #cmakedefine01 MDBX_DISABLE_VALIDATION
+#cmakedefine01 MDBX_AVOID_MSYNC
 
 /* Windows */
 #cmakedefine01 MDBX_WITHOUT_MSVC_CRT