LinuxQuestions.org - c++ linker errors

Hi,
here's the program:

Code:

string decToBin(int num)

{

        string s;

        int remainder=0;

        

        while (true)

        {

                if (num==0)

                {

                        break;

                }

        

                remainder=num%2;

                s=i2str(remainder)+s;

                num=num >> 1;

        }

        

        return s;

}



string i2str(int aV)

{

        char buf[8];

        sprintf(buf, "%d", aV);

        return (string)buf;

}

and here are the errors. I have no idea what they are about (OK i understand they have to do with allocating a string, but...):

Code:

test4.cpp:46:2: warning: no newline at end of file

test4.cpp: In function ‘int main()’:

test4.cpp:45: warning: cannot pass objects of non-POD type ‘struct std::string’ through ‘...’; call will abort at runtime

/tmp/ccYbXerR.o: In function `__static_initialization_and_destruction_0(int, int)':

test4.cpp:(.text+0x23): undefined reference to `std::ios_base::Init::Init()'

/tmp/ccYbXerR.o: In function `__tcf_0':

test4.cpp:(.text+0x66): undefined reference to `std::ios_base::Init::~Init()'

/tmp/ccYbXerR.o: In function `i2str(int)':

test4.cpp:(.text+0xa1): undefined reference to `std::allocator<char>::allocator()'

test4.cpp:(.text+0xb1): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)'

test4.cpp:(.text+0xba): undefined reference to `std::allocator<char>::~allocator()'

test4.cpp:(.text+0xcd): undefined reference to `std::allocator<char>::~allocator()'

/tmp/ccYbXerR.o: In function `decToBin(int)':

test4.cpp:(.text+0xff): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()'

test4.cpp:(.text+0x15a): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator=(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'

test4.cpp:(.text+0x163): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'

test4.cpp:(.text+0x176): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'

test4.cpp:(.text+0x185): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'

test4.cpp:(.text+0x198): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'

test4.cpp:(.text+0x1b7): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'

/tmp/ccYbXerR.o: In function `std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':

test4.cpp:(.text._ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_[std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)]+0x1e): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'

test4.cpp:(.text._ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_[std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)]+0x2b): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::append(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'

test4.cpp:(.text._ZStplIcSt11char_traitsIcESaIcEESbIT_T0_T1_ERKS6_S8_[std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)]+0x3e): undefined reference to `std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()'

/tmp/ccYbXerR.o:(.eh_frame+0x13): undefined reference to `__gxx_personality_v0'

collect2: ld returned 1 exit status