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Semantic MediaWiki
There are 1 incomplete or pending task to finish installation of Semantic MediaWiki. An administrator or user with sufficient rights can complete it. This should be done before adding new data to avoid inconsistencies.1. Command-line options[edit source]
Here are a few commonly-used command line options for BitBake.
| 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 |
| -b | execute tasks from a specific .bb recipe directly. This does not handle any dependencies from other recipes.
bitbake -b ../meta-st/meta-st-cannes2/recipes-multimedia/gstreamer/gstreamer1.0-plugins-stm_local.bb -f -c compile |
| -v | show verbose output |
| -DDD | show lots of debug information |
| -s | show recipe version information |
| -e | output recipe environment variables
bitbake -e <recipe> |
| --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
bitbake -g <recipe> dot -v -Tpng -o package-depends.png package-depends.dot dot -v -Tpng -o pn-depends.png pn-depends.dot dot -v -Tsvg -o task-depends.svg task-depends.dot |
Here are a few examples of command line options for BitBake.
| How to | Command | Comment |
|---|---|---|
| How to get the version of packages | bitbake -s | |
| How to get the Image package list | bitbake <image> -g | Then: cat pn-buildlist |
| How to clean a module | bitbake <module> -f -c cleanall | |
| How to clean an image | bitbake <image> - c cleanall | |
| How to load the packages to a local hard drive | bitbake <image> -f -c fetchall | |
| How to get the list of tasks | bitbake <image> -f -c listtasks | |
| How to display all appends | bitbake-layers show-appends | |
| How to display all layers | bitbake <recipe-or-image-name> -g -u depexp | |
| How to configure the kernel | bitbake <kernel_module> -c menuconfig | kernel module : linux-stm32 |
| How to make an SDK relocatable image | bitbake <image> -c populate_sdk | self-extracting image available in tmp-glibc/deploy/sdk |
2. .bb file syntax[edit source]
This table lists some of the syntaxes found in recipe (.bb) files.
| 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 when parsing this line |
VAR += "foo" |
append with space | |
VAR =+ "foo" |
prepend with space | |
VAR .= "foo" |
append without space | |
VAR =. "foo" |
prepend without space | |
VAR_append = "foo" |
append without space | |
OVERRIDES="string1:string2" VAR = "foo" VAR_string1 = "bar" |
alternate/override value | if string1 is listed in OVERRIDES, use "bar" for value of VAR, otherwise use "foo" |
OVERRIDES="string1:string2" VAR = "foo" VAR_append_string1 = " bar" |
conditional append | if string1 is in OVERRIDES, then append " bar" to the value of VAR |
BBVERSIONS="1.0 1.8 string" VAR="foo" VAR_string="bar" |
range-specific conditional | If the version of the package is in the specified range (1.0-1.8 in this example), then perform an override on the indicated variable |
VAR = "foo ${@<line-of-python-code>}"
|
python code expansion | ex: VAR = "the date is: ${@time.strftime(’%Y%m%d’,time.gmtime())}" |
include foo |
include file | include file named "foo", search BBPATH |
require [<path>]foo |
require file | include file named "foo", failing if not found exactly where specified |
do_sometask() {
<shell code>
}
|
define a task using shell code | |
python do_sometask {
<python code>
|
define a task using python code | |
addtask sometask (before|after) other_task |
add a task | adds a defined task to the list of tasks, with a specific ordering. Zero or more 'before' or 'after' clauses can be used. |
VAR [some_flag]="foo" |
associate a subsidiary flag value to a variable | a few subsidiary flag value names are well-defined: "dirs", "cleandirs", "noexec", "nostamp", "fakeroot", "umask", "deptask", "rdeptask", "recdeptask", "recrdeptask" %%%
Flag values appear to be used exclusively with task definitions (i.e. do_sometask) |
[edit source]
| Syntax | Meaning | Notes |
|---|---|---|
| bitbake-layers | Shows information about layers and recipes | Included in the bitbake/bin directory in openembedded source tree. |
| bitbake-whatchanged <image> | Shows all changes made since the last generation of image | bitbake st-image-weston # Edit the recipes bitbake-whatchanged st-image-weston |
| bitbake -g -u depexp <recipe-or-image-name> | Shows dependency information in a graphical interface | |
| bitbake -u goggle st-image-weston | simple graphical interface | This is a simple graphical wrapper over the streaming text output of BitBake. It shows collapsible trees for the logs for sub-tasks for each recipe. |
4. Useful links[edit source]
- https://www.openembedded.org/wiki/BitBake_(user)
- http://www.openembedded.org/wiki/Main_Page
- Yocto Project Develpoment Manual
- BitBake User Manual