title: gdb doesn't print debugging info
body: <p>when i run the core file in gdb, gdb doesn't show where the error is coming from or what line
  in the application that causes the problem.</p>
  
  <p>i'm using the compiler options -g -DDEBUG -D_DEBUG, but it doesnt seem help.</p>
  
  <p>Any help would be appreciated, thanks.</p>