when i debug bitcoind, the gdb notice "unhandled dyld version" msg

[lovecodelc]

hi,all.
i work on mac os, i compile source code with "./configure --enable-debug", when use gdb attach bitcoind's pid , it shows:
"warning: unhandled dyld version (15)
0x00007fffe026ac8a in ?? ()"

i break at 0x00007fffe026ac8a, it actually break "main" function?
and it show "?? ()" ??
but i file bitcoind symbol tables, it does not work.

do you have such problems when develop program on mac os?
thank you.