In the Yocto build I can able to inherit a class globally to all recipes from local.conf adding
INHERIT += "<class-name>"
For this I need to edit the local.conf manually before the build. How to inherit the class globally for all recipes from image recipe (.bb) tried adding "inherit as mentioned in Yocto bitbake user manual but that doesn't work it results in build error.
Related
What changes should make to enable dlt-system.
In build folder dlt-system application is not generating.
Manually by using command: cmake -D with dlt-system=ON it will generate but I need to generate while building please look at recipie image
Your recipe supports dlt-system via PACKAGECONFIG.
In order to activate that flags in the compilation process, you just need to add dlt-system to PACKAGECONFIG in .bb or .bbappend file to the recipe:
PACKAGECONFIG_append = " dlt-system"
If you want to add it from local.conf:
PACKAGECONFIG_pn-name_append = " dlt-system"
Just change name with your recipe name.
This will add -DWITH_DLT_SYSTEM=ON to EXTRA_OECMAKE which is used in do_configure of the cmake class.
I'm trying to add a library (a cmake project) to my Yocto project/image.
The package essentially consists of one static library (named hello.a) with some header files in C.
I wrote a recipe and could configure, compile, package it.
The packaging results are four files {hello-dbg, hello-dev, hello-src, hello-staticdev}.deb
So there is no hello.deb.
And that seems to be a problem preventing me to create image.
The following packages have unmet dependencies:
packagegroup-utils-extra : Depends: hello but it is not installable
E: Unable to correct problems, you have held broken packages.
When I try to add that by defining:
FILES_${PN} += "/usr/lib/hello.a"
bitbake does not allow adding static libraries to anything but staticdev -> so that does not work.
My question is then, as the title says, how to (force Yocto to) create ${PN}.deb file?
The empty packages (i.e. containing no files) are not created by default. If you want to override it, you can do it via the ALLOW_EMPTY variable for a package like this:
ALLOW_EMPTY:${PN} = "1"
You can also check the official documentation for ALLOW_EMPTY.
Just for clarification:
You can install the ${PN} package (it won't install any file on the target system).
As before, your static library will still be shipped in the ${PN}-staticdev package.
I have some self written yocto recipes, which create issues with the yocto sstate-cache mechanism (like not rebuilding the recipe when dependencies have changed). Is there a way to disable sstate-caching on a per recipe basis?
Searching the interwebs I can only find very old and by now broken mechanisms:
https://patchwork.openembedded.org/patch/17039/
Or only partial disable functions:
https://patchwork.openembedded.org/patch/130719/
My Yocto version is Zeus and above.
Thanks and cheers!
In the recipe:
SSTATE_SKIP_CREATION = "1"
or, from outside the recipe (e.g. local.conf):
SSTATE_SKIP_CREATION_pn-recipefoo = "1"
SSTATE_SKIP_CREATION_pn-recipebar = "1"
You can verify if sstate exists for a recipe, using oe-check-sstate, e.g.:
oe-check-sstate yourimage | grep recipefoo
and you can remove sstate for a recipe using:
bitbake -c cleansstate recipefoo
However, it is concerning that your recipe interferes with the sstate mechanism. Ensure that you are correctly setting & updating the version and revision of your packages whenever the source code changes.
If your recipe source is stored alongside your Yocto metadata, consider using externalsrc to reference it, allowing Yocto to better track changes.
How do I include a shared library in another bitbake recipe that makes use of a makefile to compile a program depending on the shared library?
So i have:
bitbake recipe for compiling a shared library(mylib.so)
bitbake recipe for a small program(myprog) depending on the library(mylib.so)
How do link the shared library to this small program?
You need to set up proper dependency. If mylib.so is required to compile myprog, add package that supplies mylib.so to compile time dependencies of myprog.
Usually package name is the same as corresponding recipe's name, so if the recipe that produces mylib.so is named mylib_1.0.bb, add the following line to the recipe for myprog:
DEPENDS += "mylib"
If mylib.so is used only at runtime, use
RDEPENDS_${PN} += "mylib"
The task do_kernel_configme is defined in yocto base layers and added to by meta-raspberrypi. How do I override only the parts added by meta-raspberrypi using a bbappend file?
Current setup is something like:
meta-mylayer rpi-recipe.bbappend do_kernel_configme_prepend()
meta-raspberrypi rpi-recipe.bb do_kernel_configme_prepend()
<yocto base layers> some-recipe.bb do_kernel_configme()
When I run this, both additions are prepended which means the "mylayer" code is run first, then meta-raspberrypi, then base.
How do I completely override the meta-raspberrypi additions so only the "mylayer" code followed by base layer code is executed.
(The same question also applies to do_configure task.)