Obective-C undefined reference to ___objc_class_name_NSObject on Windows

[ASHKAN HOVEYDAI]

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Hi,

I'm a newcomer to Objective-C. I have Windows XP.
I have downloaded and installed the followings:

gnustep-system-0.23.0-setup
gnustep-core-0.23.1-setup
gnustep-devel-1.0.0-setup

Here is mu first program from a tutorial which is very simple:

#include <stdio.h>
#import <stdio.h>
#import <Foundation/NSObject.h>

@interface MyClass:NSObject{
    int a;
    int b;
    }
    -(void) setvara : (int) x;
    -(void) setvarb : (int) y;
    -(int) add;
@end

@implementation MyClass
   -(void) setvara :(int) x{
     a=x;
   }
   -(void) setvarb :(int) y{
     b=y;
   }
   -(int) add{
     return a+b;
   }
@end


int main(int argc, char *argv[]){

  MyClass *class = [[MyClass alloc]init];
  [class setvara : 5];
  [class setvarb : 6];
  printf("Sum is : %d",[class add]);
  [class release];
  return ;
}


When I use:
   gcc -o filename  filename.h  -I /c/gnustep/gnustep/system/library/headers  -L /c/gnustep/gnustep/system/library/libraries
to compile the file I receive the following errors:

undefined reference to   ___objc_class_name_NSObject
undefined reference to  ___objc_exec_class

1- Could you kindly tell me how I can tackle this problem
2- How can I set any environmental variables so that I can avoid typing
       -I /c/gnustep/gnustep/system/library/headers  -L /c/gnustep/gnustep/system/library/libraries
every time.

Thank you very much for your assistance in advance.

Ashkan

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[David Chisnall]

On 19 Oct 2009, at 19:06, ASHKAN HOVEYDAI wrote:

> undefined reference to   ___objc_class_name_NSObject

This means that you have not linked against the library that provides  
the NSObject class (gnustep-base).

> undefined reference to  ___objc_exec_class

This means that you have not linked against the Objective-C runtime  
library.

> 2- How can I set any environmental variables so that I can avoid  
> typing
>        -I /c/gnustep/gnustep/system/library/headers  -L /c/gnustep/
> gnustep/system/library/libraries
> every time.

Either use GNUstep make to build, or add `gnustep-config {options}` to  
your GCC command line.

David

-- Sent from my Apple II



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[Nicola Pero-4]

>
> When I use:
>    gcc -o filename  filename.h  -I /c/gnustep/gnustep/system/library/
> headers  -L /c/gnustep/gnustep/system/library/libraries
> to compile the file I receive the following errors:
>
> undefined reference to   ___objc_class_name_NSObject
> undefined reference to  ___objc_exec_class
>
> 1- Could you kindly tell me how I can tackle this problem
> 2- How can I set any environmental variables so that I can avoid  
> typing
>        -I /c/gnustep/gnustep/system/library/headers  -L /c/gnustep/
> gnustep/system/library/libraries
> every time.

The easiest way to start is to use gnustep-make to compile and link  
your tool for you.  Check

http://www.gnustep.it/nicola/Tutorials/WritingMakefiles/index.html

for a tutorial on writing GNUmakefiles and using gnustep-make.

Thanks



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