Re: YellowDog Linux on G4 compiling basic ObjC program

[Fred Kiefer]

Vladimir Leven wrote:
> Hi,
>
> I can't figure out how to compile a simple ObjC program on Yellow Dog 
> Linux. My main.m looks like
>
> #import <Foundation/Foundation.h>
> int main(int argc, const char *argv[]) {
>    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
>    NSLog(@"all tests passed");
>    [pool release];
>    return 0;
> }
>
> and my GNUmakefile like
>
> include $(GNUSTEP_MAKEFILES)/common.make
> TOOL_NAME=mtest
> string_OBJC_FILES = mtest.m

This is the line that is causing you trouble.
The name of your tool is "mtest", but you specify the file that would
constitute a tool names "string". Replacing this with

mtest_OBJC_FILES = mtest.m

should work


> include $(GNUSTEP_MAKEFILES)/tool.make
>
> make produces:
>
> Making all for tool mtest...
> Linking tool mtest ...
> /usr/lib/crt1.o(.rodata+0x4): undefined reference to `main'
> collect2: ld returned 1 exit status
> make[1]: *** [shared_obj/mtest] Error 1
> make: *** [mtest.all.tool.variables] Error 2
>
> What am I doing wrong?
> And actually, I would be even more interested in how to build my test 
> program directly with gcc. I'm considering using ObjC/GnuStep-Base for 
> embedded development and would prefer not to use the supplied makefiles.

To see the actual gcc command you have to switch on the verbose mode by 
doing:
make messages=yes