[yocto] Managing multiple builds

[Timothy Froehlich]

Thank you, that looks like a very good idea.

On Thu, Feb 14, 2019 at 8:28 AM Ulf Samuelsson <yocto at emagii.com> wrote:

> Den 2019-02-14 kl. 10:00, skrev Alexander Kanavin:
> > On Thu, 14 Feb 2019 at 01:35, Timothy Froehlich <tfroehlich at archsys.io>
> wrote:
> >> Hi, I've been struggling a bit with this question. I want to use Yocto
> to build two+ products with separate dev/prod images for each (dev
> including debug-tweaks, etc.). I've ruled out separate image recipes
> because my dev builds need ENABLE_UART on my RaspberryPi and that needs to
> be set at the conf level (I've got it set conditionally in my base dist
> conf). Multiconfig looked promising, but I'm not happy about how long the
> parsing takes to start a build. "--postread" looked nice, but I've barely
> seen it mentioned so I'm worried that it's not well supported.
> >>
> >
> > Which recipes use the ENABLE_UART setting? You might want to write two
> > variants of those, and include them into images accordingly.
> >
> > Alex
> >
>
> Some guys I know solved the problem a little bit differently, and they
> did not mind to share.
> I created a meta-layer with that and some other ideas.
>
> * https://github.com/emagii/meta-map-sheriffco
>
> An example recipe is:
> ==================================
> SUMMARY = ""
> DESCRIPTION = ""
>
> inherit license-mit
>
> SRC_URI = " \
>         file://class/class-recipe.c \
>         file://class/Makefile \
> "
>
> EXTRA_OEMAKE_class-development = 'CFLAGS="${CFLAGS} -DDEVELOPMENT"'
> EXTRA_OEMAKE_class-production  = 'CFLAGS="${CFLAGS} -DPRODUCTION"'
> EXTRA_OEMAKE_class-release     = 'CFLAGS="${CFLAGS} -DRELEASE"'
>
> do_install-class-development () {
>         install -d      ${D}${bindir}
>         install -m 0755 class   ${D}${bindir}/development
> }
>
> do_install-class-production () {
>         install -d      ${D}${bindir}
>         install -m 0755 class   ${D}${bindir}/production
> }
>
> do_install-class-release () {
>         install -d      ${D}${bindir}
>         install -m 0755 class   ${D}${bindir}/release
> }
>
> BBCLASSEXTEND = "development production release"
> ==================================
> You now have the same recipe which builds four package variants.
>
> <package>,
> <package>-development,
> <package>-production,
> <package>-release,
>
> The base package is not included in any image.
> In the development image, you install the <package>-development and so on.
> ==================================
> Three bbclasses are used, one for each special package.
>
> Here is the development.bbclass
> ==================================
> # Class for use in BBCLASSEXTEND to make it easier to have a single
> recipe that
> # build and generate packages separately for development and normal images.
> #
> # Usage:
> # BBCLASSEXTEND = "development"
>
> CLASSOVERRIDE .= ":class-development"
>
> python development_virtclass_handler () {
>      # Do nothing if this is inherited, as it's for BBCLASSEXTEND
>      if "development" not in (d.getVar('BBCLASSEXTEND') or ""):
>          bb.error("Don't inherit development, use BBCLASSEXTEND")
>          return
>
>      # Restore BPN
>      bpn = d.getVar('BPN')
>      newbpn = bpn.replace('-development', '')
>      d.setVar('BPN', newbpn)
>
>      # Use default FILESPATH searching for patches and files
>      filespath = d.getVar('FILESPATH')
>      newfilespath = filespath.replace('-development', '')
>      d.setVar('FILESPATH', newfilespath)
> }
>
> addhandler development_virtclass_handler
> development_virtclass_handler[eventmask] = "bb.event.RecipePreFinalise"
>
> ==================================
>
> --
> Best Regards
> Ulf Samuelsson
> --
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> yocto at yoctoproject.org
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>


-- 
Tim Froehlich
Embedded Linux Engineer
tfroehlich at archsys.io
215-218-8955
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