Dear All,
Please find a small tar file which evidentiates a problem with the g++
compiler or the linker. Here is the story. I make a dylib that contains a
global entity which is a class. This class contains a static member, which
is again a class. The parent class of this is a pure virtual class. One of
the member functions of this class is called in the constructor of the
class associated with the global variable. This function exists in the
base class and calls a function that is pure abstract in the base class
but implemented in the derived class. When the dylib is loaded, the global
variable is initialised, the class constructor is called, the function in
the base class is called correctly. However when this function calls the
other function, which is pure abstract in the base class and implemented
in the derived class, the program dies.
On SunOS, Alpha OSF1, Linux (both IA32 and AI64, g++ and intel
compilers) and windows/cygwin this short program works correctly. On
MacOSX 10.3 with g++ and ibm xlC compilers the program dies with
[/Users/fca/sstest] gdb ./sstest
GNU gdb 5.3-20030128 (Apple version gdb-330.1) (Fri Jul 16 21:42:28 GMT 2004)
Copyright 2003 Free Software Foundation, Inc.
[...]
Reading symbols for shared libraries ... done
(gdb) run
Starting program: /Users/fca/sstest/sstest
Reading symbols for shared libraries +. done
Static::ctor
Virtual::Print
Program received signal EXC_BAD_ACCESS, Could not access memory.
0x0001ff00 in Virtual::Print() (this=0x27420) at static.cxx:21
21 PrintAdd();
(gdb)
All the elements of the picture are necessary, including the static data
member. I would be glad if someone could help me with this. Best regards,
Federico Carminati
==============================================================================
|| Federico Carminati || Telephone : +41.22.767.4959 ||
|| CERN-EP || Fax : +41.22.767.9480 ||
|| 1211 Geneva 23 || Mobile : +41.76.487.4843 ||
|| Switzerland || ||
==============================================================================
Attachment:
sstest.tgz Description: GNU Zip compressed data
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