How to compile Objective-C code with GCC ?

How to compile Objective-C code with GCC ?

[niXman]

Hi,

When I try to compile this code that I got form here([1]) with gcc:
#import <stdio.h>
#import <objc/Object.h>

@interface Hello: Object
- (void) init;
- (void) say;
@end

@implementation Hello
- (void) init {
  [super init];
}
- (void) say {
  printf("Hello, world!\n");
}
@end

int main() {
  Hello *hello = [Hello new];
  [hello say];
  [hello free];
  return 0;
}

Comand line: g++ -x objective-c++ test.mm -otest -lobjc

When code is compiled I get the following warnings:
test.mm:11:14: warning: ‘Object’ may not respond to ‘-init’ [enabled by default]
test.mm:11:14: warning: (Messages without a matching method signature
[enabled by default]
test.mm:11:14: warning: will be assumed to return ‘id’ and accept
[enabled by default]
test.mm:11:14: warning: ‘...’ as arguments.) [enabled by default]
test.mm: In function ‘int main()’:
test.mm:19:28: warning: ‘Hello’ may not respond to ‘+new’ [enabled by default]
test.mm:21:14: warning: ‘Hello’ may not respond to ‘-free’ [enabled by default]

If I try to run - I get SIGSEGV:
$> ./test
$> Segmentation fault

What I am doing wrongly?

Thanks.


[1] http://en.wikipedia.org/wiki/List_of_Hello_world_program_examples#Objective-C



-- 
Regards,
niXman
___________________________________________________
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Re: How to compile Objective-C code with GCC ?

[niXman]

Oops =)

linux-x86_64, gcc-4.7.2


-- 
Regards,
niXman
___________________________________________________
Dual-target(32 & 64-bit) MinGW compilers for 32 and 64-bit Windows:
http://sourceforge.net/projects/mingwbuilds/
___________________________________________________
Another online IDE: http://liveworkspace.org/

Re: How to compile Objective-C code with GCC ?

[niXman]

ping?


-- 
Regards,
niXman
___________________________________________________
Dual-target(32 & 64-bit) MinGW compilers for 32 and 64-bit Windows:
http://sourceforge.net/projects/mingwbuilds/
___________________________________________________
Another online IDE: http://liveworkspace.org/

Re: How to compile Objective-C code with GCC ?

[Tim Prince]

On 1/17/2013 5:14 AM, niXman wrote:
> ping?
>
>
Does your g++ -v show that objective-c++ was included in the build 
options?  If not, you would build your own copy with that option 
included.  Then you would use that front end, rather than expecting g++ 
to make the switch automatically.
Your messages have several spam filter baits; more people would see them 
sooner if you would clean it up.

-- 
Tim Prince

Re: How to compile Objective-C code with GCC ?

[niXman]

2013/1/17 Tim Prince <n8tm@aol.com>:
> Does your g++ -v show that objective-c++ was included in the build options?

Hi,

output:

nixman-home:~/v8-3# g++-4.7 -v
Using built-in specs.
COLLECT_GCC=g++-4.7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.7.2-2ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs
--enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.7 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-gnu-unique-object --enable-plugin --enable-objc-gc
--disable-werror --with-arch-32=i686 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1)


Thanks.

Re: How to compile Objective-C code with GCC ?

[niXman]

ping?

Re: How to compile Objective-C code with GCC ?

[Germán A. Arias]

El sáb, 19-01-2013 a las 00:49 +0400, niXman escribió:
> ping?

Why not try gnustep?

www.gnustep.org

Re: How to compile Objective-C code with GCC ?

[Jonathan Wakely]

On 21 January 2013 13:11, Alec Teal wrote:
> Could you forward me the original message (just joined the mailing list!)

It's in the archives:
http://gcc.gnu.org/ml/gcc-help/2013-01/msg00132.html

Re: How to compile Objective-C code with GCC ?

[Alec Teal]

Could you forward me the original message (just joined the mailing list!)
Surely though this is a job for search engines? 
http://ubuntuforums.org/showthread.php?t=1064045 the first result.
http://gcc.gnu.org/onlinedocs/gcc/Objective_002dC.html this *will* have 
some useful stuff.

The most useful one however will probably be:
http://en.wikibooks.org/wiki/Objective-C_Programming/Getting_Started

Enjoy
Alec

On 21/01/13 13:04, Åke Forslund wrote:
> I'm not an expert on Objective-C (in fact I haven't worked with it at all) so take my advice with a grain of salt. I think your hello world test is a bit over complicated, I tried this example (found on Swedish Wikipedia):
>
> #import <stdio.h>
> #import <objc/Object.h>
>   
> @interface MyClass : Object {
> }
> - (void)world;
> @end
>   
> @implementation MyClass
> - (void)world {
>      printf("hello, World!\n");
> }
> @end
>   
> int main() {
>      id hello = [MyClass new];
>      [hello world];
>      return 0;
> }
>
> I compiled with gcc hello.m -lobjc -o hello
> This worked with no warnings and printed "Hello World!" as expected. (I must admit that my gcc is somewhat old 4.4.5)
>
> /Åke
>
> Åke Forslund
> Lasermax Roll Systems
> Tel: +46 (0) 372-25639
>
>
> -----Ursprungligt meddelande-----
> Från: gcc-help-owner@gcc.gnu.org [mailto:gcc-help-owner@gcc.gnu.org] För niXman
> Skickat: den 18 januari 2013 21:49
> Till: gcc-help@gcc.gnu.org
> Ämne: Re: How to compile Objective-C code with GCC ?
>
> ping?

RE: How to compile Objective-C code with GCC ?

[Åke Forslund]

I'm not an expert on Objective-C (in fact I haven't worked with it at all) so take my advice with a grain of salt. I think your hello world test is a bit over complicated, I tried this example (found on Swedish Wikipedia):

#import <stdio.h>
#import <objc/Object.h>
 
@interface MyClass : Object {
}
- (void)world;
@end
 
@implementation MyClass
- (void)world {
    printf("hello, World!\n");
}
@end
 
int main() {
    id hello = [MyClass new];
    [hello world];
    return 0;
}

I compiled with gcc hello.m -lobjc -o hello
This worked with no warnings and printed "Hello World!" as expected. (I must admit that my gcc is somewhat old 4.4.5)

/Åke

Åke Forslund
Lasermax Roll Systems
Tel: +46 (0) 372-25639


-----Ursprungligt meddelande-----
Från: gcc-help-owner@gcc.gnu.org [mailto:gcc-help-owner@gcc.gnu.org] För niXman
Skickat: den 18 januari 2013 21:49
Till: gcc-help@gcc.gnu.org
Ämne: Re: How to compile Objective-C code with GCC ?

ping?