what is gdb ? how can i run my application in iphone !

when i build for iphone , application is not loaded. directly it is close . but in xcode it shows the message like [gdb] .
what is gdb ? how can i run my application ?

I don’t develop for iPhone or on Linux, but this is what i’ve found in google after 30 sec:

http://sources.redhat.com/gdb/

GDB is a debugger. Usually you need a developer license1 from Apple to build anything for iPhone. The information you’ve given won’t help much to spot the problem.