Build for each arch from one project. Multi Targets about antares

[nekromant]

Well, so far the only thing that can be made here - have a few configs, like config_boardX. And build your project N times. If each config has a different name under images/ - that will be good.
You can add a custom receipe to project Makefile to do that for you.
There's an env variable, KCONFIG_CONF, if I remember correct, that sets the config file for kconf and friends (replaces default .config), that can be of use here.
0.1.x versions of antares had a 'profile-switch' mechanism for that, but I had to remove that, since that was hacky, buggy, complicated things for single-profile builds, etc. And never worked out.
So far I haven't come up with a convenient way to do that. If you have any ideas - you're welcome. Note, that truly multi-profile build will require a LOT of buildsystem hacking.
namely, you'll need to maintain N build/, tmp/ include/generated/ directories, for each of your configs, so that rebuilds won't take forever on big profiles.
Btw #40 should be fixed before even starting work on this, so that ARCH_FEATURES work as expected.