From ae8398281161bd827b1aee5dacb02de7c0b10d50 Mon Sep 17 00:00:00 2001
From: Leonid Yuriev <leo@yuriev.ru>
Date: Sun, 14 Oct 2018 12:47:29 +0300
Subject: [PATCH] mdbx-windows: setup DllMain() as entry and don't linking with
 CRT.

17 of 17 for https://github.com/leo-yuriev/libmdbx/issues/43

Change-Id: Ie3b37633ab081ca4ba2dc485e67de96df032a3df
---
 dll.vcxproj       |  8 ++++++++
 src/lck-windows.c | 13 +++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/dll.vcxproj b/dll.vcxproj
index c9e6d975..e808a124 100644
--- a/dll.vcxproj
+++ b/dll.vcxproj
@@ -133,6 +133,9 @@
       <FavorSizeOrSpeed>Size</FavorSizeOrSpeed>
       <OmitFramePointers>true</OmitFramePointers>
       <WholeProgramOptimization>true</WholeProgramOptimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <AssemblerOutput>All</AssemblerOutput>
     </ClCompile>
     <Link>
       <TargetMachine>MachineX86</TargetMachine>
@@ -142,6 +145,7 @@
       <OptimizeReferences>true</OptimizeReferences>
       <LinkTimeCodeGeneration>UseLinkTimeCodeGeneration</LinkTimeCodeGeneration>
       <AdditionalDependencies>ntdll.lib;$(IntermediateOutputPath)mdbx_ntdll_extra.lib;kernel32.lib;advapi32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
     </Link>
     <CustomBuildStep>
       <Message>Generate fake-library mdbx_ntdll_extra.lib for $(PlatformTarget)</Message>
@@ -185,10 +189,14 @@
       <OmitFramePointers>true</OmitFramePointers>
       <WholeProgramOptimization>true</WholeProgramOptimization>
       <WarningLevel>EnableAllWarnings</WarningLevel>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <AssemblerOutput>All</AssemblerOutput>
     </ClCompile>
     <Link>
       <LinkTimeCodeGeneration>UseLinkTimeCodeGeneration</LinkTimeCodeGeneration>
       <AdditionalDependencies>ntdll.lib;$(IntermediateOutputPath)mdbx_ntdll_extra.lib;kernel32.lib;advapi32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
     </Link>
     <CustomBuildStep>
       <Message>Generate fake-library mdbx_ntdll_extra.lib for $(PlatformTarget)</Message>
diff --git a/src/lck-windows.c b/src/lck-windows.c
index b0db378a..478c79df 100644
--- a/src/lck-windows.c
+++ b/src/lck-windows.c
@@ -27,6 +27,19 @@
 static void mdbx_winnt_import(void);
 
 #ifdef MDBX_BUILD_DLL
+/* DEBUG/CHECKED builds still require MSVC's CRT for runtime checks.
+ *
+ * Therefore we don't define dll's entry point for debug/checked builds by MSVC.
+ * In this case MSVC's will automatically use DllMainCRTStartup() from CRT
+ * library, which also automatically call DllMain() from our mdbx.dll
+ *
+ * On the other side, for RELEASE builds
+ * we explicitly define DllMain() as the entry point and don't linking with
+ * any CRT libraries (IgnoreAllDefaultLibraries = Yes). */
+#if !defined(_MSC_VER) || defined(NDEBUG)
+#pragma comment(linker, "/ENTRY:DllMain")
+#endif
+
 BOOL APIENTRY DllMain(HANDLE module, DWORD reason, LPVOID reserved)
 #else
 #if !MDBX_CONFIG_MANUAL_TLS_CALLBACK