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Re: GNUStep Under Windows

From: Darin Bray
Subject: Re: GNUStep Under Windows
Date: Fri, 29 Feb 2008 12:42:23 -0500

Ok...I attempted to use a makefile, and received the following error.

$ make
Making all for tool Fraction...
 Linking tool Fraction ...
C:/GNUstep/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../libmingw32.a(main.o):main.c:(.text+0x104): undefined reference to address@hidden'
collect2: ld returned 1 exit status
make[1]: *** [obj/Fraction.exe] Error 1
make: *** [Fraction.all.tool.variables] Error 2

The contents of my makefile are...

include $(GNUSTEP_MAKEFILES)/common.make

TOOL_NAME = Fraction
LogTest_OBJC_FILES = main.m

include $(GNUSTEP_MAKEFILES)/tool.make

My source is as follows...

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

@interface Fraction NSObject {
        int numerator;
        int denominator;

-(void) print;
-(void) setNumerator: (int) n;
-(void) setDenominator: (int) d;
-(int) numerator;
-(int) denominator;

@implementation Fraction

-(void) print {
        printf("%i/%i", numerator, denominator );

-(void) setNumerator: (int) n {
        numerator = n;

-(void) setDenominator: (int) d {
        denominator = d;

-(int) denominator {
        return denominator;

-(int) numerator {
        return numerator;


int main( int argc, const char *argv[] ) {
    // create a new instance
    Fraction *frac = [[Fraction alloc] init];

    // set the values
    [frac setNumerator: 1];
    [frac setDenominator: 3];

    // print it
    printf( "The fraction is: " );
    [frac print];
    printf( "\n" );

    // free memory
    [frac release];

    return 0;

I attempted the example given in the Makefile link you supplied below and it works perfectly so obviously I am doing something wrong.  Again, any help would be greatly appreciated.


On Fri, Feb 29, 2008 at 11:47 AM, Adam Fedor <address@hidden> wrote:

On Feb 29, 2008, at 7:09 AM, Darin Bray wrote:

> all of the pieces downloaded for GNUStep (for some reason the
> Objective-C library is missing).  I ended up downloading the Core
> and System Windows installers from the GNUStep website.  These
> installed fine, and appear to have all the pieces.  However I am
> still having issues compiling/linking programs.  I believe my
> problem lies in the include directories for my headers and
> libraries, possibly my different PATH variables.  Could someone who
> is using this setup give me an example of their gcc command line to
> build an application, as well as possibly your environment variables
> I would greatly appreciate it.

Don't try to call gcc directly - it's too hard.   Just use makefiles.
See the tutorials here:


also see docs here:


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