private String compileWindows(File nemu_file){
String nemu = nemu_file.getAbsolutePath()+File.separator;
String name = "libnemu";
WindowsCompile compiler = new WindowsCompile();
String jdk_path = compiler.jdkPath();
if(m_nativeCpuInitialized == false){
windowsCompile("cl /I\""+jdk_path+"\\include\" /I\""+jdk_path+"\\include\\win32\" "+nemu+"NativeCpuDevice.c /link /DLL /OUT:\""+nemu+"nativecpudevice.dll\" /MACHINE:X64");
}