Re: Getting Objective-C 2.0 working

[Laurent Michel]

Thanks Eric. That helps a lot! I got caught by the libobjc2 naming in Ubuntu. 
(there is even a libobjc3 package under Ubuntu).  I'll give it a try this 
morning from source.

Thanks for the pointer!

Sent from my iPad

On May 17, 2012, at 11:09 PM, Eric Wasylishen <address@hidden> wrote:

> Hi Laurent,
> 
> To use blocks in GNUstep you need to use the GNUstep Objective-C runtime, 
> a.k.a. libobjc2, whose releases are available here: 
> http://download.gna.org/gnustep/  
> 
> Unfortunately, I don't think this library is available in debian/ubuntu 
> (though I could be wrong!). Confusingly, the package called "libobjc2" in 
> debian/ubuntu is unrelated to the GNUstep Objective-C runtime and doesn't 
> support blocks.
> 
> So, as far as I know, what you'll need to do is remove the Ubuntu packages 
> for gnustep you installed, then install libobjc2 and GNUstep again from the 
> source packages. (Latest gnustep releases are at: 
> http://wwwmain.gnustep.org/resources/downloads.php)
> 
> 
> The Etoile ObjectiveC2 framework no longer exists and isn't something you 
> need to worry about. IIRC, the initial support in GNUstep for the modern 
> Objective-C runtime api's was started in that framework in Etoile, but that 
> code has since been merged into GNUstep and libobjc2.
> 
> Hope this helps,
> 
> Eric
> 
> On 2012-05-17, at 9:27 PM, Laurent Michel wrote:
> 
>> Dear All,
>> 
>> I develop on MaOS and would love to port my code to Linux. Essentially, I 
>> use Objective-C 2.0 with clang as a compiler.
>> I created an Ubuntu 12.04 VM under VMWare and installed GNUStep through that 
>> channel. I compiled a silly hello world and that worked fine.
>> My problems started when I tried to compile my own code which makes *heavy* 
>> use of Objective-C blocks. I always end-up seeing this message:
>> 
>> clang -I/usr/GNUstep/System/Library/Headers  -fblocks -fobjc-nonfragile-abi 
>> -c CPFactory.m 
>> In file included from CPFactory.m:27:
>> In file included from ./CPFactory.h:27:
>> In file included from 
>> /usr/GNUstep/System/Library/Headers/Foundation/Foundation.h:30:
>> /usr/GNUstep/System/Library/Headers/GNUstepBase/GSVersionMacros.h:287:14: 
>> fatal error: 'objc/blocks_runtime.h' file not found
>> 
>> 
>> namely, it cannot find objc/blocks_runtime.h
>> 
>> I started googling around and I found lots of conflicting information on the 
>> topic as well as reference to Etoile, and ObjectiveC2 (a framework) but it 
>> seems largely incompatible with GNUStep. I'll looking for some directions to 
>> get going with a simple code that uses blocks. For instance, a silly test 
>> like:
>> 
>> #import <Foundation/NSObject.h>
>> 
>> int foo(int (^b)(int)) {
>>  return b(5);
>> }
>> 
>> int main() {
>> 
>>  int y = 10;
>>  int z = foo(^(int x) {
>>     return y + x; 
>>     });
>>  NSLog(@"result is %d\n",z);
>> }
>> 
>> 
>> Should compile and run when linked against the Foundation framework. 
>> 
>> Any pointer is greatly appreciated.
>> 
>> --
>> Laurent
>> 
>> 
>> 
>> 
>> _______________________________________________
>> Gnustep-dev mailing list
>> address@hidden
>> https://lists.gnu.org/mailman/listinfo/gnustep-dev
>