November 2017
Intermediate to advanced
162 pages
4h 8m
English
book
Embedded Linux Development using Yocto Projects - Second Edition
by Otavio Salvador, Daiane Angolini
Content preview from Embedded Linux Development using Yocto Projects - Second Edition
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Understanding the variables scope
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
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