[poky] libc configuration of multilib config

[Jonathan Richardson]

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? Should we be defining a multilib config for a
different architecture or is this overusing the feature?



Thanks.
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