Re: Segfault when sending a message to a protocol

[Stefan Urbanek]

Thank you Nicola, with the last week's snapshot it seems to work.

Stefan

On 2002-09-19 12:11:17 +0200 Nicola Pero <nicola@brainstorm.co.uk> wrote:

> Hi Stefan,
>
> this is a bug in the compiler ... all GCC ObjC compilers have it ...
> except GCC 3.3 from CVS because I fixed it on GCC CVS one week ago :-)
>
> The bug can be summarized shortly: objects created using @protocol() will
> always crash when you send a message to them, unless a class implementing
> that protocol is compiled in the same compilation unit.
>
> So a workaround for older compilers is to add
>
> @interface FakeClass <NSObject>
> @end
>
> @implementation FakeClass
> @end
>
> to your ObjC code.
>
> GCC >= 3.3 does not have this problem.
>
> > Hi,
> >
> > I get segfault when sending a message to a protocol. [snip]
> >
> > Here is bactrace:
> >
> > #0  0x4023ec6f in objc_msg_lookup () from /usr/local/lib/libobjc.so.1
> > #1  0x080488ec in gnustep_base_user_main (argc=1, argv=0xbffff324) at test.m:16
> > #2  0x40148859 in main ()
> >      from 
> > /usr/GNUstep/System/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libgnustep-base.so.1
> > #3  0x4034714f in __libc_start_main () from /lib/libc.so.6
> >
> > And here is an example that will crash:
> >
> > ----
> >
> > #import <Foundation/NSAutoreleasePool.h>
> > #import <Foundation/NSObject.h>
> > #import <Foundation/NSString.h>
> >
> > int main(int argc, const char **argv)
> > {       
> >       NSAutoreleasePool *pool;
> >       Protocol          *p;
> >
> >       pool = [NSAutoreleasePool new];
> >
> >       p = @protocol(NSObject);
> >       NSLog(@"Protocol test %p",p);
> >       /* Crash here ...*/
> >       NSLog(@"Description   %p",[p 
> > descriptionForInstanceMethod:@selector(class)]);
> >
> >       RELEASE(pool);
> >
> >       return 0;
> > }
> >
> > ----
> >
> > Whan should be wrong?
> >
> > Thank you,
> >
> > Stefan
> >
> >
> >
> > _______________________________________________
> > Bug-gnustep mailing list
> > Bug-gnustep@gnu.org
> > http://mail.gnu.org/mailman/listinfo/bug-gnustep

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