Hi,
This error will appear if the first instance variable in a class
appears before the end of the last instance variable in the
superclass. In this case, the first instance variable is a 'struct
stat' and it is (apparently) overlapping with the isa pointer.
It's not clear from your post. Are you linking against both libobjc2
(which installs itself as libobjc.so.4) and against GCC libobjc
(libobjc.so.3 or libobjc.so.2)? If so, then you can expect things to
break quite badly, because both export the same symbols. Please use
one or the other, not both. If this is not the problem then...
Both NSObject and GSAttrDictionary are part of -base, so you will have
compiled them with the same compiler. The problem is therefore not an
issue of mismatched compilers, but it may well be something related to
the ABI handling in clang. The ivar offset calculation code is not
yet particularly well tested beyond x86 *NIX platforms. It is
possible that there is a bug.
I've just added a bit more debugging code to libobjc2, so it will tell
you what the name and offsets of the offending ivars are. Please can
you run the new version and see what the message is? Please can you
also let me know what architecture you are using, so I can check that
clang is generating the correct IR?
You can also comment out line 787 in libobjc2's init.c. This will
revert to the behaviour of the older versions of libobjc and see if
things actually break.
David
On 3 Jan 2010, at 19:33, bbceler wrote:
I finished works on porting LLVM and clang on QNX recently. I also
compiled
libobjc2 from GNUstep. clang compiles without problems programs in
C. I make
the tests of the compilation of programs in objc 2.0. That programs
do not
use GNUstep one compiles and they work without problems.
I have however the problem with compiling programs using GNUstep.
Programs
compiles but while starting the mistake appears:
./autogsdoc
Error: Instance variables in GSAttrDictionary overlap superclass
NSObjectThis probably means that you are subclassing a class from a
library,
which has changed in a binary-incompatible way.
Abort (core dumped)
Because I compiled gnustep-base use gcc runtime I thought that
should this
gnustep-base compile also with the use of clang. I compiled the
library
gnustep-base using clang and libobjc2.
The effect is the same unfortunately. I did not have problems with
programs
in objc 1.0 and GNUstep.
Can the problem come into being because of the conflicts gcc libobjc
with
the library libobjc2 from GNUstep ?
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