Question

Is there any gcc option I can set that will give me the line number of the segmentation fault?

I know I can:

1. Debug line by line
2. Put printfs in the code to narrow down.

Edits:

1. bt / where on gdb give No stack.
2. Helpful suggestion

Answer 1

I don’t know of a gcc option, but you should be able to run the application with gdb and then when it crashes, type where to take a look at the stack when it exited, which should get you close.

$ gdb blah (gdb) run (gdb) where 

Edit for completeness:

You should also make sure to build the application with debug flags on using the -g gcc option to include line numbers in the executable.

Another option is to use the bt (backtrace) command.