Sometimes it is helpful to determine what a variable expands
to during a build.
You can do examine the values of variables by examining the
output of the bitbake -e
command.
The output is long and is more easily managed in a text file,
which allows for easy searches:
$ bitbake -e virtual/kernel > some_text_file
Within the text file, you can see exactly how each variable is expanded and used by the OpenEmbedded build system.