Problem occurred while compiling a cpp program in gcc

Question

My code is

#include<iostream>   

using namespace std;  
int main()  
{  
   cout <<"hi";  
   return 0;  
}

I compile it with:

gcc d.cpp -o d

Error as follows

Undefined                       first referenced
 symbol                             in file
std::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator [](unsigned int) const/var/tmp//ccyDVhhA.o
std::cout                           /var/tmp//ccyDVhhA.o
std::ios_base::Init::~Init()        /var/tmp//ccyDVhhA.o
std::ios_base::Init::Init()         /var/tmp//ccyDVhhA.o
__gxx_personality_v0                /var/tmp//ccyDVhhA.o
std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_tr aits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)/va r/tmp//ccyDVhhA.o
std::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() c onst/var/tmp//ccyDVhhA.o
ld: fatal: Symbol referencing errors. No output written to d
collect2: ld returned 1 exit status

What is the mistake in the above code?

I can't how many times I've seen similar errors when I was moving from c to c++ — hhafez, Apr 08 '11 at 05:59
Check: http://stackoverflow.com/questions/172587/what-is-the-difference-between-g-and-gcc/173007#173007 — Martin York, Apr 08 '11 at 06:30

score 3 · Answer 1 · answered Apr 08 '11 at 05:56

3

You should compile your C++ programs with g++, not gcc. There is no mistake in the code, but if you use gcc with those parameters then your program will not be linked against the C++ standard library.

answered Apr 08 '11 at 05:56

hrnt

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Mahesh · Accepted Answer · 2011-04-08T06:19:00.653

1

g++ d.cpp -o d

Should use g++ for a c++ program ~~compilation~~ to link to C++ standard library.

edited Apr 08 '11 at 06:19

answered Apr 08 '11 at 05:57

Mahesh

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Wait, really? I thought GCC autodetects the type? (I tried compiling a Java file and it said Java isn't supported...) – user541686 Apr 08 '11 at 06:14
@Mehrdad - I amn't sure whether we could configure gcc to do that. But by default, it cannot link to C++ libraries. – Mahesh Apr 08 '11 at 06:16
@Mahesh: Yeah, weird... interesting. – user541686 Apr 08 '11 at 06:21
@Mehrdad: It does. Read http://stackoverflow.com/questions/172587/what-is-the-difference-between-g-and-gcc/173007#173007 – Martin York Apr 08 '11 at 06:30
@Martin: Doesn't the link say, `gcc will compile: *.c/*.cpp files as C and C++ respectively.`? – user541686 Apr 08 '11 at 06:35

hhafez · Answer 3 · 2011-04-08T06:11:17.043

1

that code should compile fine with a c++ compiler, however you are compiling it using gcc (a c compiler) need to use g++

edited Apr 08 '11 at 06:11

answered Apr 08 '11 at 05:57

hhafez

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Problem occurred while compiling a cpp program in gcc

3 Answers3

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