Explicitly specify C++17 flag to MSVC.

Author: levlam

CMake/TdSetUpCompiler.cmake

@@ -48,7 +48,7 @@ function(td_set_up_compiler)
       string(REPLACE "/RTC1" " " CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
     endif()
     add_definitions(-D_SCL_SECURE_NO_WARNINGS -D_CRT_SECURE_NO_WARNINGS)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /utf-8 /GR- /W4 /wd4100 /wd4127 /wd4324 /wd4505 /wd4814 /wd4702 /bigobj")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++17 /utf-8 /GR- /W4 /wd4100 /wd4127 /wd4324 /wd4505 /wd4814 /wd4702 /bigobj")
   elseif (CLANG OR GCC)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${STD17_FLAG} -fno-omit-frame-pointer -fno-exceptions -fno-rtti")
     if (APPLE)