[cfe-dev] Objective-C Boxed Expressions Error: unexpected '@' in program

[David Chisnall]

The new syntax is only supported with the non-fragile ABI.  Please add either -fobjc-nonfragile-abi or -fobjc-runtime=gnustep to your compile flags.

The new ABI is the default on *BSD, however clang defaults to the GCC ABI on GNU platforms for greater compatibility with legacy Objective-C implementations.

David

On 4 Dec 2012, at 06:05, Charalampos Chrysovalantis Emmanouilidis wrote:

> I'm trying to compile some Boxed Expressions with clang 3.1
> 
> ##
> # Clang Version
> ##
> charemma $ clang --version 
> Debian clang version 3.1-5ppa1 (branches/release_31) (based on LLVM 3.1)
> Target: i386-pc-linux-gnu
> Thread model: posix
> 
> ##
> # Sample code in main.c
> ##
> NSString *path = @(getenv("PATH"));
> NSLog(@"PATH %@", path);
> 
> 
> ##
> # compiler usage
> ##
> charemma$ clang  -x objective-c -I/opt/GNUstep/include  -o main.c.o  -c main.c
> main.c:10:22: error: unexpected '@' in program
>     NSString *path = @(getenv("PATH"));
>                      ^
> 1 error generated.
> 
> Do I need to pass any specific flag to clang to get support for Boxed Expressions like @(getenv("PATH"))?
> 
> According to this article http://clang.llvm.org/docs/ObjectiveCLiterals.html this should be supported starting with clang v3.1
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