Одна строка до кроссплатфарменности

#include <stdio.h>
#include<iostream>
/**
* Determination a platform of an operation system
* Fully supported supported only GNU GCC/G++, partially on Clang/LLVM
*/
 
#if defined(_WIN32)
#define PLATFORM_NAME "windows" // Windows
#elif defined(_WIN64)
#define PLATFORM_NAME "windows" // Windows
#elif defined(__CYGWIN__) && !defined(_WIN32)
#define PLATFORM_NAME "windows" // Windows (Cygwin POSIX under Microsoft Window)
#elif defined(__ANDROID__)
#define PLATFORM_NAME "android" // Android (implies Linux, so it must come first)
#elif defined(__linux__)
#define PLATFORM_NAME "linux" // Debian, Ubuntu, Gentoo, Fedora, openSUSE, RedHat, Centos and other
#elif defined(__unix__) || defined(__APPLE__) && defined(__MACH__)
#include <sys/param.h>
#if defined(BSD)
#define PLATFORM_NAME "bsd" // FreeBSD, NetBSD, OpenBSD, DragonFly BSD
#endif
#elif defined(__hpux)
#define PLATFORM_NAME "hp-ux" // HP-UX
#elif defined(_AIX)
#define PLATFORM_NAME "aix" // IBM AIX
#elif defined(__APPLE__) && defined(__MACH__) // Apple OSX and iOS (Darwin)
#include <TargetConditionals.h>
#if TARGET_IPHONE_SIMULATOR == 1
#define PLATFORM_NAME "ios" // Apple iOS
#elif TARGET_OS_IPHONE == 1
#define PLATFORM_NAME "ios" // Apple iOS
#elif TARGET_OS_MAC == 1
#define PLATFORM_NAME "osx" // Apple OSX
#endif
#elif defined(__sun) && defined(__SVR4)
#define PLATFORM_NAME "solaris" // Oracle Solaris, Open Indiana
#else
#define PLATFORM_NAME NULL
#endif
 
// Return a name of platform, if determined, otherwise - an empty string
char * get_platform_name() 
{
    return (PLATFORM_NAME == NULL) ? "" : PLATFORM_NAME;
}
 
int main(int argc, char *argv[]) {
    puts(get_platform_name());
    system("pause");
    return 0;
}