Re: NSObject errors compiling Objective-C programs

[Sašo Kiselkov]

The problem is in your GNUmakefile. Replace OBJC_PROGRAM_NAME with TOOL_NAME and
instead of

include $(GNUSTEP_MAKEFILES)/objc.make

do

include $(GNUSTEP_MAKEFILES)/tool.make

Your problem is based on the fact that GNUstep-make allows you to also build
"plain" Objective-C programs with no dependency on GNUstep-base or GNUstep-gui
whatsoever - that's what "OBJC_PROGRAM_NAME" and "objc.make" are for. However,
NSObject is defined in GNUstep-base, so you need to use "TOOL_NAME" and
"tool.make" = a command line program with gnustep-base (but without
gnustep-gui) linked in.

Quoting "Mehul N. Sanghvi" <mehul.sanghvi@gmail.com>:

>
> OK, so I've got gnustep-base and gnustep-make installed.  I'm trying to
> follow the code as given on the "Objective-C for Beginners" website
> which is refrenced from the gnustep.org website.
>
> I am getting the following error when I try to compile the simple
> fractions example:
>
> prompt% make
> Making all for objc_program fraction_driver...
>   Compiling file fraction_driver.m ...
>   Compiling file fraction.m ...
>   Linking objc_program fraction_driver ...
> ./shared_obj/fraction.o(.data.rel+0xf4): undefined reference to
> `__objc_class_name_NSObject'
> collect2: ld returned 1 exit status
> make[1]: *** [shared_obj/fraction_driver] Error 1
> make: *** [fraction_driver.all.objc-program.variables] Error 2
>
>
> What am I doing wrong ?  I'm just trying to compile a simple
> Objective-C program, using the GNUstep make system.
>
>
> cheers,
>
>       mehul
>
>
> ---- begin header file ----
> #import <Foundation/Foundation.h>
>
> @interface Fraction: NSObject
> {
>    int numerator;
>    int denominator;
> }
>
> /* rest of code snipped */
> ---- end header file ----
>
>
> ==== GNUmakefile ====
> include $(GNUSTEP_MAKEFILES)/common.make
>
> # Space seperated list of executables to be built
>
> OBJC_PROGRAM_NAME = fraction_driver
>
> fraction_driver_OBJC_FILES = fraction_driver.m fraction.m
>
> include GNUmakefile.preamble
> include $(GNUSTEP_MAKEFILES)/objc.make
> ==== GNUmakefile ends ====
>
>
> ~~~~ GNUmakefile.preamble ~~~~~
> ADDITIONAL_OBJCFLAGS += -Wall -Wno-import #-fnext-runtime
>
> ~~~~ GNUmakefile.preamble ~~~~~
>
>
>
>
> --
> Mehul N. Sanghvi
> email: mehul.sanghvi@gmail.com

--
Saso