Debugging coredumps in different computers

[Bruno Gonzalez (STenyaK)]

I'm new to debugging using core dumps. I've managed to get core dumps
 + symbols using g++ and gdb under linux.
 I compile using g++ -g -dH, and i debug using  gdb executableFile -c
 coredumpFile.

This is a test program backtrace in the original computer (a gentoo
 box), where the program was compiled, run, and coredumped:
 (gdb) bt
 #0  0xffffe410 in __kernel_vsyscall ()
 #1  0x4017a101 in raise () from /lib/libc.so.6
 #2  0x4017b8e8 in abort () from /lib/libc.so.6
 #3  0x400ed794 in __gnu_cxx::__verbose_terminate_handler () from /
usr/
 lib/gcc/i686-pc-linux-gnu/4.1.2/libstdc++.so.6
 #4  0x400eb1b5 in ?? () from /usr/lib/gcc/i686-pc-linux-gnu/4.1.2/
 libstdc++.so.6
 #5  0x400eb1f2 in std::terminate () from /usr/lib/gcc/i686-pc-linux-
 gnu/4.1.2/libstdc++.so.6
 #6  0x400eb2aa in __cxa_rethrow () from /usr/lib/gcc/i686-pc-linux-
gnu/
 4.1.2/libstdc++.so.6
 #7  0x08049047 in main () at main.cpp:46

And this is what i get after i scp the exe and dump to a different
 computer (a kubuntu box):
 (gdb) bt
 #0  0xffffe410 in __kernel_vsyscall ()
 #1  0x4017a101 in modff () from /lib/libc.so.6
 #2  0x4017b8e8 in sigorset () from /lib/libc.so.6
 #3  0x400ed794 in ?? ()
 #4  0x0804c038 in ?? ()
 #5  0x00000001 in ?? ()
 #6  0x00000002 in ?? ()
 #7  0x4027d560 in ?? () from /lib/libc.so.6
 #8  0x40035000 in ?? ()
 #9  0x00000001 in ?? ()
 #10 0x0804c060 in ?? ()
 #11 0x4000d6e9 in ?? () from /lib/ld-linux.so.2
 #12 0x400351b8 in ?? ()
 #13 0x40035c10 in ?? ()
 #14 0x00000000 in ?? ()

As you can see, the backtraces differ, and i lose almost all symbols.
 What am i doing wrong? Thanks in advance!