Helo, all, Adam!
Adam Fedor wrote:
> Ildar Mulyukov wrote:
>
>> This error occures in every program linked with gnustep-base.
>>
>> My configuration is Cygwin+GCC 3.0.1 self-built compiler (see
>> http://www.cygwin.com/ml/cygwin/2001-10/msg00502.html). Due to test
>> (see the reference above) I don't think it's compiler problem.
>>
>> I'll try to dig the problem but maybe you have any ideas? Any
>> comments would be appreciated.
>> Thank you, Ildar.
>>
>> *** GDB log ***
>> Starting program:
>> /d/Temp/doc/objc/test/./shared_debug_obj/ix86/cygwin/gnu-gnu-gnu/Test.exe
>>
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> _c_GSFFCallInvocation__load (self=0x4f51fc, _cmd=0xa019c98) at
>> GSFFCallInvocation.m:454
>>
>
>
> That's pretty odd. Are you using the libobjc library that comes with
> gcc 3.0 or the gnustep-obj library? The gcc one doesn't properly
> export some variables, but that would just not let you link the
> program, I don't think it would cause it to crash.
This is actually not the problem of GCC's libobjc. In fact
gnustep-libobjc does not export all needed symbols either (e.g.
__objc_msg_forward). But this problem can be fixed very simply - just by
adding symbols into libobjc.def file (again in
http://www.cygwin.com/ml/cygwin/2001-10/msg00502.html
<http://www.cygwin.com/ml/cygwin/2001-10/msg00502.html>
). I tried also gcc-2.95.3+gnustep-libobjc pair with the same result. I
found the real problem. Look at that simple code:
*****
extern void* (*__objc_msg_forward)(void*);
main() {
void* p;
p = __objc_msg_forward;
__objc_msg_forward = 0; }
*****
when I do "gcc -g test.c -lobjc && ./a.exe" it coredumps with segfault.
The problem occures when writing to __objc_msg_forward (the last line of
the program). This is very strange as the example above works OK with a
simple DLL exporting a variable like __objc_msg_forward. Probably I
should ask about it at cygwin list...
Regards, Ildar.
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