Roberto Rocco Angeloni

Hi,
as I’m about to become an iPhone programmer (another one?), I’ve decided to set up an objective-c environment on my Ubuntu too.

First, I’ve downloaded all the packages for ObjectiveC and GNUstep I’ve found on Synaptic.

Second, I’ve tried to compile a classical Hello World file with gcc. Here’s the code (’Ciao mondo’ stands for ‘Hello world’ in Italian):

#import <Foundation/Foundation.h>

int main(int argc, char* argv[]) {
        NSLog(@"Ciao mondo");
        return 0;
}

and i saved the source in a file called main.m

After that I’ve tried: gcc main.c -o hello and I soon got the following error message:

main.m:2:34: error: Foundation/Foundation.h: No such file or directory
main.m: In function ‘main’:
main.m:5: error: cannot find interface declaration for ‘NXConstantString’

So after surfing a while on Yahoo’s search results, I came to the solution:

1. Execute

. /usr/share/GNUstep/Makefiles/GNUstep.sh

to initialize the environment variables for the GNUstep.

2. Use the gnustep-config –objc-flags to retrieve the correct flags for gcc and link the main.m with the gnustep-base library, this way:

gcc `gnustep-config --objc-flags` -lgnustep-base main.m -o hello

3. Execute ./hello and you’ll got:

2008-08-07 14:58:13.537 hello[20074] Ciao mondo

See also:
• Writing GNUstep makefiles and
• Additional Installation on GNUstep.org

Enjoy,
Rob.

Tags: GNUstep, ObjectiveC

This entry was posted on Thursday, August 7th, 2008 at 2:05 pm and is filed under Linux, ObjectiveC, Ubuntu. You can follow any responses to this entry through the RSS 2.0 feed. Responses are currently closed, but you can trackback from your own site.