The BitBake metadata has thousands of variables, but the scope where these variables are available depends on where it is defined. Basically, there are two kinds of variables as follows:
- Variables defined in configuration files are global to every recipe. The parsing order of the main configuration files is shown as follows:
- build/conf/local.conf
- <layer>/conf/machines/<machine>.conf
- <layer>/conf/distro/<distro>.conf
- Variables defined within recipe files are local to the specific recipe only during the execution of its tasks
