HI everyone i have compiled the FS with CFLAGS="-g -ggdb -finstrument-functions" and MOD_CFLAGS="-g -ggdb -finstrument-functions", and it works done. but the problem comes when i use addr2line command to translate some function address to its name. This is the detail: $ addr2line -e freeswitch -f -a 0x2a955d3f8a 0x0000002a955d3f8a ?? ??:0 Note: 0x2a955d3f8a is some function's address I think that addr2line can NOT find freeswitch's symbols, but where it is, anyone any advice? thanks for your reply! yours simon