Add cmake build for Windows

CMakeLists.txt

@@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.24)
+
+project(LMDB
+  LANGUAGES C)
+
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+
+set(CMAKE_Swift_COMPILE_OPTIONS_MSVC_RUNTIME_LIBRARY MultiThreadedDLL)
+
+add_subdirectory(Sources)
+add_subdirectory(cmake/modules)

Package.swift

@@ -20,6 +20,7 @@ let package = Package(
         // Targets can depend on other targets in this package, and on products in packages which this package depends on.
         .target(
             name: "CLMDB",
-            dependencies: []),
+            dependencies: [],
+            exclude: ["CMakeLists.txt"]),
     ]
 )

Sources/CLMDB/CMakeLists.txt

@@ -0,0 +1,7 @@
+add_library(LMDB
+  mdb.c
+  midl.c)
+target_include_directories(LMDB PUBLIC
+  include)
+
+set_property(GLOBAL APPEND PROPERTY LMDB_EXPORTS LMDB)

Sources/CLMDB/include/module.modulemap

@@ -0,0 +1,3 @@
+module CLMDB {
+  header "lmdb.h"
+}

Sources/CMakeLists.txt

@@ -0,0 +1 @@
+add_subdirectory(CLMDB)

cmake/modules/CMakeLists.txt

@@ -0,0 +1,7 @@
+
+set(LMDB_EXPORTS_FILE ${CMAKE_CURRENT_BINARY_DIR}/LMDBConfig.cmake)
+configure_file(LMDBConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/LMDBConfig.cmake)
+
+get_property(LMDB_EXPORTS GLOBAL PROPERTY LMDB_EXPORTS)
+export(TARGETS ${LMDB_EXPORTS} FILE ${LMDB_EXPORTS_FILE})

cmake/modules/LMDBConfig.cmake.in

@@ -0,0 +1,3 @@
+if(NOT TARGET LMDB::CLMDB)
+  include("@LMDB_EXPORTS_FILE@")
+endif()