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POUsing only g++ works, but not "g++ -c" and ld
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copied!<p>I have the following source code in main.cpp:</p> <pre><code>#include <iostream> #include <iomanip> int main() { std::cout << "Hi" << std::endl; return 0; } </code></pre> <p>Using this command works, and creates the executable file:</p> <pre><code>g++ -o main main.cpp </code></pre> <p>But this commands don't work:</p> <pre><code>g++ -c main.cpp ld -o main main.o </code></pre> <p>The second one errors with:</p> <pre><code>ld: warning: cannot find entry symbol _start; defaulting to 00000000004000e8 main.o: In function `main': main.cpp:(.text+0xa): undefined reference to `std::cout' main.cpp:(.text+0xf): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)' main.cpp:(.text+0x14): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)' main.cpp:(.text+0x1c): undefined reference to `std::ostream::operator<<(std::ostream& (*)(std::ostream&))' main.o: In function `__static_initialization_and_destruction_0(int, int)': main.cpp:(.text+0x4a): undefined reference to `std::ios_base::Init::Init()' main.cpp:(.text+0x4f): undefined reference to `std::ios_base::Init::~Init()' main.cpp:(.text+0x54): undefined reference to `__dso_handle' main.cpp:(.text+0x61): undefined reference to `__cxa_atexit' </code></pre>

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