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Layer priority is the ultimate decider of what recipe is used: if layer A has recipe foo_1 and layer B has recipe foo_2, if layer A's priority is higher than B then foo_1 will be used, even though the version in B is higher, and even if PREFERRED_VERSION_foo is set to 2. This complicates recipes moving between layers, for example when a newer version of a recipe (say, python3-wheel) is taken from a layer with a higher priority (say, meta-python) and moved to a layer with a lower priority (say, oe-core) then it has to be removed before it is added: there is no way to have it in both layers and work correctly. Higher priorities are useful in distribution layers where you may want to override specific recipes without any other fuss. However as all of the layers in meta-oe simply add more recipes in defined areas, there's no need to have a higher layer priority. Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Khem Raj <raj.khem@gmail.com> |
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meta-perl
=========
This layer provides commonly-used perl related recipes such as perl libraries
in the Comprehensive Perl Archive Network.
Contents and Help
-----------------
In this section the contents of the layer is listed, along with a short
help for each package.
-- libdbi-perl --
The DBI is a database access module for the Perl programming language.
It defines a set of methods, variables, and conventions that provide
a consistent database interface, independent of the actual database
being used.
|<- Scope of DBI ->|
.-. .--------------. .-------------.
.-------. | |---| XYZ Driver |---| XYZ Engine |
| Perl | | | `--------------' `-------------'
| script| |A| |D| .--------------. .-------------.
| using |--|P|--|B|---|Oracle Driver |---|Oracle Engine|
| DBI | |I| |I| `--------------' `-------------'
| API | | |...
|methods| | |... Other drivers
`-------' | |...
`-'
-- libdbd-sqlite-perl --
DBD::SQLite is a Perl DBI driver for SQLite, that includes the entire
thing in the distribution. So in order to get a fast transaction capable
RDBMS working for your perl project you simply have to install this
module, and nothing else.
usage: there is a test case to show you how it works
1) vim local.conf:
...
IMAGE_INSTALL:append = " libdbd-sqlite-perl"
PERL_DBM_TEST = "1"
...
2) build core-image-sato and boot the target
3) run "sqlite-perl-test.pl" on target. This script includes five
operations create/insert/update/delete/select to do with a table.
More information can be found in the recipe's git log.
Dependencies
------------
This layer depends on:
URI: git://git.openembedded.org/openembedded-core
branch: master
Adding the meta-perl layer to your build
---------------------------------------
In order to use this layer, you need to make the build system aware of
it.
Assuming the meta-perl layer exists at the top-level of your
yocto build tree, you can add it to the build system by adding the
location of the meta-perl layer to bblayers.conf, along with any
other layers needed. e.g.:
BBLAYERS ?= " \
/path/to/oe-core/meta \
/path/to/layer/meta-perl \
Maintenance
-----------
Send patches / pull requests to openembedded-devel@lists.openembedded.org with
'[meta-perl]' in the subject.
When sending single patches, please using something like:
git send-email -M -1 --to openembedded-devel@lists.openembedded.org --subject-prefix='meta-perl][PATCH'
Layer maintainers:
Hongxu Jia <hongxu.jia@windriver.com>
Tim "moto-timo" Orling <ticotimo@gmail.com>
License
-------
All metadata is MIT licensed unless otherwise stated. Source code included
in tree for individual recipes is under the LICENSE stated in each recipe
(.bb file) unless otherwise stated.