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More information: https://www.gnu.org/software/gdb/

Debugging without coredump files

Code Block
$ cc -g prog.c
$ gdb ./a.out
...
(gdb) list
(gdb) stop at 10
(gdb) run
(gdb) print variable
...
(gdb) quit

Debugging with coredump files

By default your jobs will not produce coredump files when they crash. To generate corefiles you need:


Code Block
$ ulimit -c unlimited            # For bash
$ limit coredumpsize unlimited   # For tcsh

Also if you are using the Intel Fortran compiler, you will will need:

Code Block
$ export decfort_dump_flag=y    # For bash
$ setenv decfort_dump_flag y    # For tcsh

To use the coredump file, enter:

Code Block
$ cc -g prog.c
$ gdb
$ gdb ./a.out /path/to/the/coredumpfile
...
(gdb) where
(gdb) bt
(gdb) frame number
(gdb) list
(gdb) info locals
(gdb) print variable
...
(gdb) quit

Coredump files can take up a lot of disk space – be careful not to generate them if you are not going to use them.