Re: ANN: GNUstep Objective-C Runtime 1.2

[David Chisnall]

Nope, that's expected.  The configure test is checking GNU Vs NeXT there.  It 
places the GCC and GNUstep runtimes in one category and the NeXT (Apple Legacy) 
and Apple (Apple Modern) runtimes in the other category.  

This is because gcc and clang use -fgnu-runtime and -fnext-runtime to select 
between the two ABIs, with -fobjc-nonfragile-abi to differentiate within the 
group:

-fgnu-runtime:                                          GCC ABI (supported by 
GCC and GNUstep runtimes)
-fgnu-runtime -fobjc-nonfragile-abi:            GNUstep ABI (GNUstep runtime 
only, maybe GCC 4.7 runtime?)
-fnext-runtime:                                         Apple Legacy runtime / 
NeXT runtime
-fnext-runtime -fobjc-nonfragile-abi            Apple Modern runtime

On OS X, selecting -m32 or -m64 also slightly changes the ABI, but not much.

If you are using clang and the GNUstep runtime, I'd recommend that you also 
tell make's configure script that you want to use the non-fragile ABI.  This 
gives you a few extra things (non-fragile ivars, proper support for 
-forwardingTargetForSelector:, safe automatic IMP caching).  

David

On 21 Feb 2011, at 21:10, Thomas Davie wrote:

> Hi List,
> 
> I was just trying out the new GNUstep runtime, and wanted to check I'd 
> configured things right.  I've got clang 2.9 (svn) installed, along with 
> gnustep-make and libobjc2 as described below.  With that all ready, I tried 
> to configure gnustep-base and amongst the output I got:
> 
> checking the Objective-C runtime... GNU
> checking for custom shared objc library... 
> /usr/GNUstep/Local/Library/Libraries
> 
> The custom shared objc library seems to be pointing to where I've just 
> installed libobjc2, but the report of the GNU runtime seems surprising – is 
> this a bug in the configure script, or have I set something up wrongly here?
> 
> Thanks
> 
> Tom Davie
> 
> On 21 Feb 2011, at 13:56, David Chisnall wrote:
> 
>> In preparation for the next GNUstep release, I've pushed a bug-fix release 
>> of libobjc2.  This includes numerous small bug fixes and has been tested 
>> with the -base and -gui test suites.
>> 
>> David
>> 
>> GNUstep Objective-C Runtime 1.2
>> ===============================
>> 
>> This is the 1.2 release of the GNUstep Objective-C runtime (a.k.a.
>> libobjc2).  This runtime was designed to support the features of Objective-C 
>> 2
>> for use with GNUstep and other Objective-C programs.  This release contains
>> several bug fixes, and is tested with the current GNUstep trunk, so will be
>> compatible with the upcoming GNUstep release.
>> 
>> You may obtain the code for this release from subversion at the following
>> subversion branch:
>> 
>> svn://svn.gna.org/svn/gnustep/libs/libobjc2/1.2
>> 
>> Alternatively, a tarball is available from:
>> 
>> http://download.gna.org/gnustep/libobjc2-1.2.tar.bz2
>> 
>> The runtime library is responsible for implementing the core features of the
>> object model, as well as exposing introspection features to the user.  The
>> GNUstep runtime implements Apple's Objective-C Runtime APIs, and a small 
>> number
>> of GCC APIs for legacy compatibility.
>> 
>> This library is based on the Étoilé Objective-C Runtime, an earlier research
>> prototype, and includes support for non-fragile instance variables,
>> type-dependent dispatch, and object planes.  It is fully compatible with the
>> FSF's GCC Objective-C ABI and also implements a new ABI that is supported by
>> Clang and is required for some of the newer features.
>> 
>> Although the runtime has been tested by several people, and is being used
>> extensively by the Étoilé project, it is entirely new (MIT licensed) code and
>> may still contain bugs.  If you come across any problems, please report them 
>> to
>> the GNUstep Developer mailing list <gnustep-dev@gnu.org>.  
>> 
>> _______________________________________________
>> Discuss-gnustep mailing list
>> Discuss-gnustep@gnu.org
>> http://lists.gnu.org/mailman/listinfo/discuss-gnustep
> 


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