fix cmake build issue. fix build type checker. rm IronPad windows header including under linux

IronPad/CMakeLists.txt

@@ -1,11 +1,10 @@
 cmake_minimum_required(VERSION 3.12)
 project(IronPad LANGUAGES CXX)
 
-# set standard
-set(CMAKE_CXX_STANDARD 20)
-
-# add libcmo
-add_subdirectory("../LibCmo" "LibCmo.out")
+# add libcmo if not existed
+if (NOT TARGET LibCmo)
+	add_subdirectory("../LibCmo" "LibCmo.out")
+endif ()
 
 # setup sources
 set(ironpad_headers ".")
@@ -24,3 +23,11 @@ target_include_directories(IronPad
 PUBLIC
 	${ironpad_headers}
 )
+
+# set project standard
+set_target_properties(IronPad
+PROPERTIES
+	CXX_STANDARD 20
+	CXX_STANDARD_REQUIRED 20
+	CXX_EXTENSION OFF
+)

IronPad/IronPad.cpp

@@ -1,9 +1,14 @@
 #include "IronPad.hpp"
+
+// only include these header on windows.
+// in other words, include these header when ironpad enabled.
+#if defined(IRONPAD_ENABLED)
 #include <Windows.h>
 #include <DbgHelp.h>
 #include <filesystem>
 #include <cstdarg>
 #include <cstdio>
+#endif
 
 namespace IronPad {