GDB image watch

Setup

Some of the setup is specific to using these scripts in a docker container on MacOS. Running natively or in docker on Linux will be easier.

XQuartz allows display of windows from a linux container on MacOS.

Install XQuartz - an X.org X window system for MacOS. Logout and login required after install.
- brew install xquartz
Change security settings
- Launch XQuartz.
- Under the XQuartz menu, select Preferences
- Go to the security tab and ensure "Allow connections from network clients" is checked.
Test. Run the following commands. You should see a Linux version of firefox running
- Note: some instructions say to xhost + 127.0.0.1. This is not recommended.

xhost + $(hostname)
docker run -e DISPLAY=host.docker.internal:0 jess/firefox

The DISPLAY environment variable can be set in the docker compose file with this at the same level as build

    environment:
      - DISPLAY=host.docker.internal:0

Install python dependencies in the container. We may add this to the docker image if it's found to be useful.
1. pip: apt install python3-pip
2. The Tk backend works apt install python3-tk
3. Matplotlib: python3 -m pip install matplotlib
Checkout https://github.com/cuekoo/GDB-ImageWatch. cv_imshow.py is the entirety of the needed code.
.gdbinit files Contents of /root/.gdbinit (we should not be using root as the user, in which case, this would be /home//.gdbinit)

add-auto-load-safe-path <path-to-source>/.gdbinit

Example Local .gdbinit

source /path/to/cv_imshow.py

gdb bin/report
source /path/to/cv_imshow.py # if you did not set up .gdbinit

<set a breakpoint>
run
<hit breakpoint>
cv_imshow <image>

There's also OpenImageDebugger which looks to require some compiling and install.