How to access environment variables inside .gdbinit and inside gdb itself?

Question

I am looking to set up the path for the source code when debugging with gdb. I chose to do that with a .gdbinit file.

Basically, it contains a command:

d         


        

Answer 1

(6 year late!)

Don't use .gdbinit for this purpose. It does not expand env vars. Instead, use this commandline to launch gdb:

gdb --init-eval-command="set dir $SOURCESROOT/src"

(gdb) show dir
/path/to/src

FYI this technique can be used to set other critical variables, e.g

gdb --eval-command="set sysroot $SYSROOTDIR"

Which sets sysroot and solib-absolute-prefix in gdb