C++ Compiler Name

//wget http://pastebin.com/raw.php?i=LsvHAZqC main.cpp; g++ main.cpp -o test; ./test

#include <string>

using namspace std;

string to_string()
{
    return "";
}

template<typename T>
string to_string(T x)
{
    stringstream str;
    str << x;
    return str.str();
}

string CompilerName()
{
    return "built " __DATE__ " " __TIME__

    "; built with: "
#if defined(__clang__)
    "Clang/LLVM " __VERSION__
#elif defined(__ICC) || defined(__INTEL_COMPILER)
    "Intel ICC/ICPC " + to_string(__INTEL_COMPILER_BUILD_DATE) +
#elif defined(__GNUC__) || defined(__GNUG__)
    "GNU GCC/G++ " __VERSION__
#elif defined(__HP_cc) || defined(__HP_aCC)
    "Hewlett-Packard C/C++ " + to_string(__HP_aCC) + to_string(__HP_cc) +
#elif defined(__IBMC__) || defined(__IBMCPP__)
    "IBM XL C/C++ " __xlc__
#elif defined(_MSC_VER)
    "Microsoft Visual Studio " + to_string(_MSC_FULL_VER) +
#elif defined(__PGI)
    "Portland Group PGCC/PGCPP"
#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
    "Oracle Solaris Studio"
#else
    " unknown compiler"
#endif
    ;
}

int main(int, char**)
{
    cout << CompilerName() << "\n";

    return 0;
}