Difference between revisions of "Bitbake Cheat Sheet"
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VAR_appends_string1 = " bar" | VAR_appends_string1 = " bar" | ||
|conditional appending | |conditional appending | ||
| − | |if string1 | + | |if string1 is in OVERRIDES, then append " bar" to the value of VAR |
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Revision as of 19:52, 30 October 2012
Here are some quick notes on bitbake syntax and rules. For an exhaustive list of functionality, and longer descriptions, see the bitbake manual at: http://docs.openembedded.org/bitbake/html/ (note that this link goes to the OpenEmbedded version of the bitbake manual, which is a version from 2006 as of this writing. A separate (yocto-specific?) bitbake manual is included in source form in the yocto project source directory, under bitbake/doc.)
Options
| Option | Meaning |
|---|---|
| -c <task> | execute <task> for the image or recipe being built. ex: bitbake -c fetch busybox.
Some of the possible tasks are: fetch, configure, compile, package, clean |
| -f | force execution of the operation, even if not required |
| -v | show verbose output |
| -DDD | show lots of debug information |
| -s | show recipe version information |
| --help | get usage help |
| -c listtasks <image-or-recipe-name> | show the tasks associated with an image or individual recipe |
| -g <recipe> | output dependency tree in graphviz format |
Syntax
| Syntax | Meaning | NOTES |
|---|---|---|
| VAR = "foo" | simple assignment | |
| VAR ?= "foo" | assign if no other value is already assigned (default assignment) | |
| VAR ??=foo | weak default assignment | takes lower precedence than ?= |
| VAR = "stuff ${OTHER_VAR} more" | variable expansion | OTHER_VAR expanded at time of reference to VAR |
| VAR := "stuff ${OTHER_VAR} more" | immediate variable expansion | OTHER_VAR expanded at time of parsing this line |
| VAR += "foo" | append with space | |
| VAR =+ "foo" | prepend with space | |
| VAR .= "foo" | append without space | |
| VAR =. "foo" | prepend without space | |
| OVERRIDES="string1:string2" VAR = "foo" |
alternate/override value | if string1 is listed in OVERRIDES, use "bar" for value of VAR, otherwise use "foo" |
| OVERRIDES="string1:string2" VAR = "foo" |
conditional appending | if string1 is in OVERRIDES, then append " bar" to the value of VAR |
