[ulugbey]

Hi,

I want to write a simple code in OpenFoam

// A hello world program in C++
#include<iostream>
using namespace std;
int main()
        {
                cout << "Hello World!";
                return 0;
        }

when I try to compile this code using

g++ hello_world.cpp

It throws an error

In file included from /root/OpenFOAM/ThirdParty-v1712/platforms/linux64/gcc-6.3.0/include/c++/6.3.0/x86_64-pc-linux-gnu/bits/c++config.h:507:0,
from /root/OpenFOAM/ThirdParty-v1712/platforms/linux64/gcc-6.3.0/include/c++/6.3.0/iostream:38,
from hello_world.cpp:2:
/root/OpenFOAM/ThirdParty-v1712/platforms/linux64/gcc-6.3.0/include/c++/6.3.0/x86_64-pc-linux-gnu/bits/os_defines.h:39:22: fatal error: features.h: No such file or directory
#include <features.h>
^
compilation terminated.

Do you have an idea why I get this error?

Best regards.

[Tobermory]

This is a little odd. Did you list the WHOLE of your code?

// A hello world program in C++
#include<iostream>
using namespace std;
int main()
        {
                cout << "Hello World!";
                return 0;
        }

or do you have other lines in your hello_world.cpp? The compiler/linker is complaining that it can't include header file features.h, since it doesn't know where it is, but I don't see a

#include <features.h>

line in your code ... unless you only shared part of the code, in which case the problem is in the bit you didn't share!

[ulugbey]

I shared the whole code. There is not another part.

[Tobermory]

Ok - that IS wierd, but a quick google search shows that it's a fairly common problem that's not associated with OpenFOAM - there's something wrong/incomplete with your g++ installation, see e.g.:

https://stackoverflow.com/questions/...ow-do-i-get-it

Try checking/reinstalling your g++ installation. Good luck.

[ulugbey]

Thanks,

Your suggestion helped to solve the problem.

I implemented

sudo apt-get install g++-multilib

It works now!

[Tobermory]

Great job - well done!