Compiling obj-c 2.0 with Foundation Kit on xubuntu 12.04 LTS with clang & llvm

This was tricky for me, so I am posting a guide as usual.

1. sudo apt-get install subversion

2. sudo apt-get install build-essential

3. sudo apt-get install pacman

4. sudo apt-get install libobjc2

5. sudo apt-get install clang

6. Then follow the instructions here:

        http://clang.llvm.org/get_started.html

Here is a sample program:

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])

{

    @autoreleasepool {

        

        // insert code here...

        NSLog(@"Hello, World!");

        

    }

    return 0;

}

Save it as main.m and to compile it do:

sudo clang main.m `gnustep-config --objc-flags` `gnustep-config --objc-libs` -x objective-c -fconstant-string-class=NSConstantString -fobjc-nonfragile-abi -fblocks -lgnustep-base -lgnustep-gui -ldispatch -I /usr/include/GNUstep -L /usr/lib/GNUstep

it will create a file called a.out, to run it do:

sudo ./a.out

References:

http://sohanikh.blogspot.com/2013/02/how-to-build-llvm-from-source-on-ubuntu.html
http://clang.llvm.org/get_started.html

http://stackoverflow.com/questions/14921482/clang-compiling-error-undefined-reference-to-objc-autoreleasepoolpush