Re: How to enable "shorthand" access element in NSArray

[Rael Bauer]

On 2014/12/28 12:47 PM, David Chisnall wrote:
> Are you targeting the non-fragile ABI?

I was not aware of whether I was or wasn't (I am very new to 
gnustep/objective-C). After some research it seems that I was not. (just 
using the default). If I add this line to the GNUmakefile:

test_OBJCFLAGS += -fobjc-nonfragile-abi

Then it does compile ok (there is a warning though), however then the 
linker gives a list of errors

./obj/test.obj/test.m.o: In function `main':
C:/GNUstep/msys/1.0/home/User/Projects/Test/test.m:7: undefined 
reference to `objc_msgSend'
C:/GNUstep/msys/1.0/home/User/Projects/Test/test.m:8: undefined 
reference to `objc_msgSend'
C:/GNUstep/msys/1.0/home/User/Projects/Test/test.m:13: undefined 
reference to `objc_msgSend'
C:/GNUstep/msys/1.0/home/User/Projects/Test/test.m:15: undefined 
reference to `objc_msgSend'
collect2: ld returned 1 exit status

Do you have any advice on how to fix this error?

> This array accessor notation is a terrible idea,

Can you please elaborate on why you say that?
> so I'd recommend that you avoid it,
I am going through a tutorial/lecture series, which is based on XCode, 
and trying to follow the code on Windows with GNUstep. It makes it a lot 
easier if I can just use the code provided by the lecture instead of 
making changes to every few lines..

> as it (along with the property notation) destroy one of the key strengths of 
> Objective-C: the orthogonality of syntax.  In particular, with the fragile ABI, you 
> were allowed to allocate C arrays of objects, so myArray[1] means *(&myArray + 
> 1).  It looks like that's what you're getting here, because the result of this will 
> be an NSArray (not an NSArray*), which is incompatible with an id.
>
> And are you sure that you're using clang?  That looks very much like a GCC 
> error...
Yes, I do think so. I have

CC=clang in the GNUmakefile, (clang version 3.4)

This line: NSArray * myArray = @[@"A", @"B", @"C"];

does not compile without it.

Thanks
-Rael