Compiling hello world.cpp in terminal (macOS) [duplicate] - c++

Question

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What is an undefined reference/unresolved external symbol error and how do I fix it?
(39 answers)
Compiling a C++ program with GCC
(9 answers)
Closed 3 years ago.
I'm trying to compile a C++ helloWorld in terminal.
#include <iostream>
using namespace std;
int main() {
cout << "!!!Hello World!!!" << endl; // prints !!!Hello World!!!
return 0;
}
I cd to the directory containing the code. I manage to compile with the command g++ -o hello c_helloworld.cpp. But when I use the command gcc -o hello c_helloworld.cpp I get the following error.
Undefined symbols for architecture x86_64: "std::__1::locale::use_facet(std::__1::locale::id&) const", referenced
from:
std::__1::ctype const& std::__1::use_facet >(std::__1::locale const&)
in c_helloworld-a3d3b8.o "std::__1::ios_base::getloc() const",
referenced from:
std::__1::basic_ios >::widen(char) const in c_helloworld-a3d3b8.o "std::__1::basic_string,
std::__1::allocator >::__init(unsigned long, char)", referenced
from:
std::__1::basic_string, std::__1::allocator >::basic_string(unsigned long, char) in
c_helloworld-a3d3b8.o "std::__1::basic_string, std::__1::allocator
::~basic_string()", referenced from:
std::__1::ostreambuf_iterator > std::__1::__pad_and_output >(std::__1::ostreambuf_iterator >, char const*, char const*, char const*, std::__1::ios_base&, char) in
c_helloworld-a3d3b8.o "std::__1::basic_ostream >::put(char)", referenced from:
std::__1::basic_ostream >& std::__1::endl
(std::__1::basic_ostream >&) in c_helloworld-a3d3b8.o "std::__1::basic_ostream >::flush()", referenced from:
std::__1::basic_ostream >& std::__1::endl
(std::__1::basic_ostream >&) in c_helloworld-a3d3b8.o "std::__1::basic_ostream
::sentry::sentry(std::__1::basic_ostream >&)", referenced from:
std::__1::basic_ostream >& std::__1::__put_character_sequence
(std::__1::basic_ostream >&, char const*, unsigned long) in c_helloworld-a3d3b8.o
"std::__1::basic_ostream
::sentry::~sentry()", referenced from:
std::__1::basic_ostream >& std::__1::__put_character_sequence
(std::__1::basic_ostream >&, char const*, unsigned long) in c_helloworld-a3d3b8.o "std::__1::cout",
referenced from:
_main in c_helloworld-a3d3b8.o "std::__1::ctype::id", referenced from:
std::__1::ctype const& std::__1::use_facet >(std::__1::locale const&)
in c_helloworld-a3d3b8.o "std::__1::locale::~locale()", referenced
from:
std::__1::basic_ios >::widen(char) const in c_helloworld-a3d3b8.o "std::__1::ios_base::__set_badbit_and_consider_rethrow()", referenced
from:
std::__1::basic_ostream >& std::__1::__put_character_sequence
(std::__1::basic_ostream >&, char const*, unsigned long) in c_helloworld-a3d3b8.o
"std::__1::ios_base::clear(unsigned int)", referenced from:
std::__1::ios_base::setstate(unsigned int) in c_helloworld-a3d3b8.o "std::terminate()", referenced from:
___clang_call_terminate in c_helloworld-a3d3b8.o "___cxa_begin_catch", referenced from:
std::__1::basic_ostream >& std::__1::__put_character_sequence
(std::__1::basic_ostream >&, char const*, unsigned long) in c_helloworld-a3d3b8.o
___clang_call_terminate in c_helloworld-a3d3b8.o "___cxa_call_unexpected", referenced from:
std::__1::ostreambuf_iterator >::ostreambuf_iterator(std::__1::basic_ostream >&) in c_helloworld-a3d3b8.o
"___cxa_end_catch", referenced from:
std::__1::basic_ostream >& std::__1::__put_character_sequence
(std::__1::basic_ostream >&, char const*, unsigned long) in c_helloworld-a3d3b8.o
"___gxx_personality_v0", referenced from:
std::__1::basic_ostream >& std::__1::__put_character_sequence
(std::__1::basic_ostream >&, char const*, unsigned long) in c_helloworld-a3d3b8.o
std::__1::ostreambuf_iterator > std::__1::__pad_and_output >(std::__1::ostreambuf_iterator >, char const*, char const*, char const*, std::__1::ios_base&, char) in
c_helloworld-a3d3b8.o
std::__1::ostreambuf_iterator >::ostreambuf_iterator(std::__1::basic_ostream >&) in c_helloworld-a3d3b8.o
std::__1::basic_ios >::widen(char) const in c_helloworld-a3d3b8.o
Dwarf Exception Unwind Info (__eh_frame) in c_helloworld-a3d3b8.o ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see
invocation)

Answer 1

gcc is used to compile C programs (by default), g++ is for C++.
So, the behaviour is expected.
By default, gcc links to the standard C library.
If you want to compile C++ programs you can link to the standard C++ library by adding the following option:
gcc -o hello c_helloworld.cpp -lstdc++
PS. I suggest you to search the website before asking a question, there was already an answer for this.
Compiling a C++ program with gcc

Answer 2

Using g++ is easier for compiling .cpp files. Execute the compiled code by running ./outputfile in the directory. So basically that would be running
g++ file.cpp -o file && ./file
in the command line
Edit: My mistake.. gcc can be used here as well, but it's simpler to just use g++