Include paths not found while compiling with g++ on MacOS

Question

I'm trying to compile the simplest program on MacOS 10.6 like:

$ g++ -o hello hello.cpp

the following source:

#include <iostream>

int main (int argc, char * const argv[]) {
    std::cout << "Hello, World!\n";
    return 0;
}

I'm getting the error:

hello.cpp:1:20: error: iostream: No such file or directory
hello.cpp: In function ‘int main(int, char* const*)’:
hello.cpp:4: error: ‘cout’ is not a member of ‘std’

So obviously I have to add the include path somewhere. My question is where can I find the include directories and how can add them globally (I don't want to provide the include path whenever I want to compile).

I just installed the XCode 3.1.4 and managed to compile it via Xcode, but not via command line. I found some header files in this directory:

/Xcode3.1.4/SDKs/MacOSX10.5.sdk/System/Library/Frameworks/Kernel.framework/Versions/A/Headers

and tried to add it to the HEADER_SEARCH_PATHS after reading this question, but no luck.

I'm developing on Linux and everything is working fine there, but I want to continue doing that on MacOS. Any help?

Answer 1

On my Mac, that include file is in /usr/include/c++/4.0.0/iostream . Are you sure you have all the command-line development tools installed? They might not be by default; I'm pretty sure I had to install it manually when I first set up my Mac. There should be a "developer tools" package somewhere on your OS X installation media.

Or, if you want to make sure you're getting the latest version, you can download it from: http://developer.apple.com/technology/xcode.html

Answer 2

$ g++ -o example.bin example.cpp //to compile
$ ./example.bin //to run

It's code:

#include <iostream>
using namespace std;
int main () {
    cout << "Hello, World!\n";
    return 0;
}