Pin MSVC toolchain and add automatic min version check

This will run immediately on a process loading LiteCore into its process space.

Author: borrrden

CMakeLists.txt

@@ -262,7 +262,15 @@ target_include_directories(
     ${LiteCoreObjectsIncludes}
 )
 
-add_library(LiteCore SHARED $<TARGET_OBJECTS:LiteCoreObjects>)
+if(MSVC)
+    add_library(LiteCore SHARED $<TARGET_OBJECTS:LiteCoreObjects> MSVC/dllmain.c)
+    target_include_directories(
+        LiteCore PRIVATE
+        C/include
+    )
+else()
+    add_library(LiteCore SHARED $<TARGET_OBJECTS:LiteCoreObjects>)
+endif()
 
 add_library(LiteCoreStatic STATIC EXCLUDE_FROM_ALL $<TARGET_OBJECTS:LiteCoreObjects>)
 target_link_libraries(LiteCoreStatic PRIVATE LiteCoreObjects)

MSVC/dllmain.c

@@ -0,0 +1,98 @@
+#pragma comment(lib, "Version.lib")
+
+#include <Windows.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "c4Log.h"
+
+typedef struct {
+    WORD major;
+    WORD minor;
+    WORD build;
+    WORD revision;
+} Version;
+
+static int GetDllVersion(const wchar_t* path, Version* out_version) {
+    DWORD dummy;
+    DWORD size = GetFileVersionInfoSizeW(path, &dummy);
+    if ( size == 0 ) { return 0; }
+
+    BYTE* buffer = (BYTE*)malloc(size);
+    if ( !buffer ) { return 0; }
+    if ( !GetFileVersionInfoW(path, 0, size, buffer) ) {
+        c4log(kC4DefaultLog, kC4LogVerbose, "GetFileVersionInfoW failed: %lu", GetLastError());
+        free(buffer);
+        return 0;
+    }
+
+    VS_FIXEDFILEINFO* fileInfo;
+    UINT              len = 0;
+    if ( !VerQueryValueA(buffer, "\\", (LPVOID*)&fileInfo, &len) ) {
+        c4log(kC4DefaultLog, kC4LogVerbose, "VerQueryValueA failed: %lu", GetLastError());
+        free(buffer);
+        return 0;
+    }
+
+    if ( fileInfo ) {
+        out_version->major    = HIWORD(fileInfo->dwFileVersionMS);
+        out_version->minor    = LOWORD(fileInfo->dwFileVersionMS);
+        out_version->build    = HIWORD(fileInfo->dwFileVersionLS);
+        out_version->revision = LOWORD(fileInfo->dwFileVersionLS);
+        free(buffer);
+        return 1;
+    }
+
+    c4log(kC4DefaultLog, kC4LogVerbose, "VerQueryValueA returned NULL");
+    free(buffer);
+    return 0;
+}
+
+static int CompareVersions(const Version* a, const Version* b) {
+    if ( a->major != b->major ) return a->major < b->major ? -1 : 1;
+    if ( a->minor != b->minor ) return a->minor < b->minor ? -1 : 1;
+    if ( a->build != b->build ) return a->build < b->build ? -1 : 1;
+    if ( a->revision != b->revision ) return a->revision < b->revision ? -1 : 1;
+    return 0;
+}
+
+void CheckCppRuntime() {
+    HMODULE hMod = GetModuleHandleA("msvcp140.dll");
+    if ( !hMod ) { hMod = LoadLibraryA("msvcp140d.dll"); }
+
+    if ( !hMod ) {
+        c4log(kC4DefaultLog, kC4LogWarning, "msvcp140.dll not loaded yet, unable to check version...");
+        return;
+    }
+
+    wchar_t path[MAX_PATH];
+    if ( GetModuleFileNameW(hMod, path, MAX_PATH) == 0 ) {
+        c4log(kC4DefaultLog, kC4LogWarning, "Unable to determine msvcp140.dll filename to check version...");
+        return;
+    }
+
+    Version loaded = {0};
+    if ( !GetDllVersion(path, &loaded) ) {
+        c4log(kC4DefaultLog, kC4LogWarning, "Unable to get version of msvcp140.dll to check...");
+        return;
+    }
+
+    Version expected = {14, 36, 32457, 0};
+    int     cmp      = CompareVersions(&loaded, &expected);
+    if ( cmp < 0 ) {
+        c4log(kC4DefaultLog, kC4LogWarning, "msvcp140.dll version is older than expected: %u.%u.%u.%u < %u.%u.%u.%u",
+              loaded.major, loaded.minor, loaded.revision, loaded.build, expected.major, expected.minor,
+              expected.revision, expected.build);
+        c4log(kC4DefaultLog, kC4LogWarning, "This may cause instability in your application");
+    }
+}
+
+BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved) {
+    switch ( ul_reason_for_call ) {
+        case DLL_PROCESS_ATTACH:
+            CheckCppRuntime();
+            break;
+        default:
+            break;
+    }
+    return TRUE;
+}

jenkins/build_server_win.ps1

@@ -78,7 +78,10 @@ function Build() {
         $MsArch = "x64"
     }
 
+    # This -T version controls which version of the MSVC toolchain is used.
+    # Once it is decided for a given minor release line, it should not be changed.
     & "C:\Program Files\CMake\bin\cmake.exe" `
+        -T version=14.36 `
         -A $MsArch `
         -DEDITION="$Edition" `
         -DCMAKE_INSTALL_PREFIX="$(Get-Location)\install" `

jenkins/jenkins_win.ps1

@@ -21,7 +21,10 @@ try {
 
     New-Item -Type Directory -ErrorAction Ignore couchbase-lite-core\build_cmake\x64
     Set-Location couchbase-lite-core\build_cmake\x64
-    & 'C:\Program Files\CMake\bin\cmake.exe' -A x64 -DCMAKE_SYSTEM_VERSION="10.0" -DBUILD_ENTERPRISE=ON ..\..
+
+    # This -T version controls which version of the MSVC toolchain is used.
+    # Once it is decided for a given minor release line, it should not be changed.
+    & 'C:\Program Files\CMake\bin\cmake.exe' -A x64 -T version=14.36 -DCMAKE_SYSTEM_VERSION="10.0" -DBUILD_ENTERPRISE=ON ..\..
     if($LASTEXITCODE -ne 0) {
         Write-Host "Failed to run CMake!" -ForegroundColor Red
         exit 1