Given this small Objective-C program:
<SNIP>
#include <objc/Protocol.h>
@protocol a
- aMethod;
@end
@protocol b <a>
- bMethod;
@end
int main(int argc, char **argv)
{
if ([EMAIL PROTECTED](b) descriptionForInstanceMethod: @selector(aMethod)] != NULL)
printf("Ok\n");
}
</SNIP>
Compiling with
gcc -lobjc
Running
a.out
-> Segmentation fault
The segfault occurs in the libobjc when the Protocol tries to check it's
parents. The 'protocols'-Array contains a pointer which does _not_ point to the
parent protocol! That's why the prog crashes.
When inserting the line
if ([EMAIL PROTECTED](a) descriptionForInstanceMethod: @selector(aMethod)] != NULL)
printf("Ok\n");
as first line in the main-method all is good. The protocol 'a' (the parent) is
initialized and 'b' finds it's parent and the line that caused the crash before
is running without problems.
This is extremly critical to me and maybe a patch could be posted here so I can
patch my gcc?
P.S.: I set the component to 'libobjc' because I think that it's containing the
objc-runtime. Is this correct?
--
Summary: Protocols are not initialized correctly
Product: gcc
Version: 3.4.2
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: libobjc
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tilo at pruetz dot net
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18255
