Random misc. useful notes for debugging


When trying to debug the root cause behind a rendered framebuffer image
disappearing, I got to the point where I wanted to watch one of the pixels in
the buffer to see what was clearing it.  For that purpose, the following was a
useful bit of gdb knowledge about the details of how to watch a specific array
memory location using "watch -l":

https://stackoverflow.com/a/42251209/2037687
