[poky] libc configuration of multilib config

[Khem Raj]

On Fri, Apr 12, 2019 at 1:36 PM Jonathan Richardson
<jonathan.richardson at broadcom.com> wrote:
>
> Hi,
>
> We have a cortex-A72 tuning defined as our default tuning based on armv8.
> We also have some bare metal code that runs on a cortex M0. Yocto allows
> you to set a default tune for that multilib config so we call it softfp
> but it's an armv6 architecture with soft floating point:
>
> MULTILIB_GLOBAL_VARIANTS += "softfp"
> MULTILIBS += "multilib:softfp"
> DEFAULTTUNE_virtclass-multilib-softfp = "armv6t-novfp"
>
> Since we only have 1 recipe for code running on that processor (the SOC
> contains armv8 and an M0) we compile it as softp-recipe_name, add it to
> EXTRA_IMAGEDEPENDS along with other bootloaders and have everything in the
> same deploy/machine when we create our image.
>
> Now we want to use newlib instead of glibc for the softfp multilib config
> only. I don't see a way of configuring this. At this point should we put
> it in a different MACHINE? Are there any guidelines on when to use
> multilib and when to put it in a new machine?
>

you might want to look into multi config feature.
https://www.yoctoproject.org/docs/2.3/dev-manual/dev-manual.html#platdev-building-targets-with-multiple-configurations
https://wiki.yoctoproject.org/wiki/TipsAndTricks/BuildingZephyrImages#Arduino_101_and_Multiconfig


> Thanks.
> --
> _______________________________________________
> poky mailing list
> poky at yoctoproject.org
> https://lists.yoctoproject.org/listinfo/poky