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

In my case I'd like to set global history in common $HOME/.gdbinit, so I used

set history filename ~/.gdb_history

instead of

set history filename $HOME/.gdb_history

Answer 2

(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

Answer 3

If you don't want to involve python, then this could work?

"show environment [varname] Print the value of environment variable varname to be given to your program when it starts. If you do not supply varname, print the names and values of all environment variables to be given to your program. You can abbreviate environment as env."

ftp://ftp.gnu.org/old-gnu/Manuals/gdb/html_node/gdb_19.html

Maybe they could be used for conditions as well:

https://www.adacore.com/gems/gem-119-gdb-scripting-part-1

Answer 4

Nevermind, I found how to do it by using Python scripting.

My .gdbinit file is now:

python
import os
gdb.execute('directory' + os.environ['SOURCES'] + '/package_name/src')
end

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