compile c++ with clang - newbie - c++

Question

I found this code in a tutorial
http://www.penguinprogrammer.co.uk/c-beginners-tutorial/introduction/
// This line is necessary to be able to output information to the screen
#include <iostream>
// The program starts here and carries on line by line
int main(){
// Create two integers a and b containing 10 and 5
int a = 10;
int b = 5;
/* Add them together and store the result in another
integer called sum */
int sum = a + b;
// Output the sum to the screen
std::cout << sum << std::endl;
// End the program and send a value of 0 (success) back
// to the operating system
return 0;
}
I want to compile it
Have installed clang by doing
apt-get install clang
Compiling by doing
clang -x c++ tutorial.cpp
error
/tmp/tutorial-aa5f7a.o: In function `main':
tutorial.cpp:(.text+0xa): undefined reference to `std::cout'
tutorial.cpp:(.text+0x34): undefined reference to `std::ostream::operator<<(int)'
tutorial.cpp:(.text+0x3a): 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> >&)'
tutorial.cpp:(.text+0x46): undefined reference to `std::ostream::operator<<(std::ostream& (*)(std::ostream&))'
/tmp/tutorial-aa5f7a.o: In function `__cxx_global_var_init':
tutorial.cpp:(.text.startup+0x13): undefined reference to `std::ios_base::Init::Init()'
tutorial.cpp:(.text.startup+0x19): undefined reference to `std::ios_base::Init::~Init()'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

Use clang++ tutorial.cpp - the -x c++ is useful if you only want to compile the source file, using -c, but if you are also linking the application into an executable, you want clang to know that you are linking a C++ application, and add the c++ libraries to the link command (if you want to see what clang actually does, add the -v option.