Using gdb to detect segmentation fault in sh?

I am using scientific linux. In the directory user/project/Build , after I ran 'make' to compile and link all the cpp files,I had no problems. But then, when I went to directory , which runs the project binary in , I get a segmentation fault error. In the directory user/run, I enter 'gdb' in the command prompt and get the message "

I then set the size limit of core files by

But when I enter

I get

When I enter , I get When I then use the command prompt to go into directory

and then type

and then "run", I get

..

What am I supposed to do to detect the segmentation fault?