Add MSVC support to CMake build

build/CMakeLists.txt

@@ -53,6 +53,12 @@ target_architecture(ARCHITECTURE)
 
 include(CheckAtomic)
 
+if(WITH_STATIC)
+  if(MSVC)
+    set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+  endif()
+endif()
+
 include_directories(${LIBI2PD_SRC_DIR})
 FILE(GLOB LIBI2PD_SRC ${LIBI2PD_SRC_DIR}/*.cpp)
 add_library(libi2pd ${LIBI2PD_SRC})
@@ -133,6 +139,10 @@ if(APPLE)
   add_definitions(-DMAC_OSX)
 endif()
 
+if(MSVC)
+  add_definitions(-DWINVER=0x0501)
+  add_definitions(-D_WIN32_WINNT=0x0501)
+else()
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Winvalid-pch -Wno-unused-parameter -Wno-uninitialized")
   set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -pedantic")
   # TODO: The following is incompatible with static build and enabled hardening for OpenWRT.
@@ -153,6 +163,7 @@ elseif(CXX11_SUPPORTED)
   else()
     message(SEND_ERROR "C++17 nor C++11 standard not seems to be supported by compiler. Too old version?")
   endif()
+endif()
 
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pipe")
@@ -217,7 +228,11 @@ if(WITH_STATIC)
   set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
 
   set(Boost_USE_STATIC_LIBS ON)
+  if(MSVC)
+    set(Boost_USE_STATIC_RUNTIME ON)
+  else()
     set(Boost_USE_STATIC_RUNTIME OFF)
+  endif()
 
   set(OPENSSL_USE_STATIC_LIBS ON)
 
@@ -244,7 +259,7 @@ else()
   add_definitions(-DBOOST_SYSTEM_DYN_LINK -DBOOST_FILESYSTEM_DYN_LINK -DBOOST_PROGRAM_OPTIONS_DYN_LINK -DBOOST_DATE_TIME_DYN_LINK -DBOOST_REGEX_DYN_LINK)
 endif()
 
-find_package(Boost COMPONENTS system filesystem program_options date_time REQUIRED)
+find_package(Boost REQUIRED COMPONENTS system filesystem program_options date_time OPTIONAL_COMPONENTS atomic)
 if(NOT DEFINED Boost_INCLUDE_DIRS)
   message(SEND_ERROR "Boost is not found, or your boost version was below 1.46. Please download Boost!")
 endif()
@@ -307,8 +322,10 @@ if(WITH_BINARY)
   endif ()
 
   if(WITH_STATIC)
+    if(NOT MSVC)
       set_target_properties("${PROJECT_NAME}" PROPERTIES LINK_FLAGS "-static")
     endif()
+  endif()
 
   if(WITH_HARDENING AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set_target_properties("${PROJECT_NAME}" PROPERTIES LINK_FLAGS "-z relro -z now")