Re: Hello World not getting off the ground

[David Chisnall]

On 1 Jul 2017, at 18:45, Jay Versluis <versluis2000@yahoo.com> wrote:

> I’m trying to compile this with gcc `gnustep-config —objc-flags` 
> `gnustep-config —base-libs` -o hello *.m

If you wish to use gcc for Objective-C, then be aware that you are restricted 
to not being able to use ARC or any of the newer syntactic sugar related to 
NSValue, NSArray and NSDictionary literals.  This includes @autoreleasepool and 
so you will need to explicitly create NSAutoreleasePool objects.


> Compiling with the same statements yields no errors. I’d say “hurra”, however 
> when I run the app, I get what feels like several hundred lines or errors, 
> all beginning with “autorelease pool called for object”, followed by a 
> variety of NSObjects such as NSUserDefaults, NSDateMalloc, NSCalendarDate as 
> well as stuff like GSDictionary, GSInlineString, GSAbsoluteTime - in short, 
> nothing that I’ve called here.

Right, this is what you’d expect because you don’t have an autorelease pool in 
place and NSLog generates a number of autoreleased objects in response to 
various +initialize methods.

> What’s perhaps interesting is that I’m getting the exact same problem under 
> CentOS 7, Ubuntu 16, as well as Windows 10. Yes indeed, I’ve tried them all!

Unsurprising, this is exactly what you should expect.  If you wish to use a 
modern dialect of Objective-C, then you will need to use clang, not gcc.

David