"Build at once" broken

[Bernhard Fischer]

On Thu, Jan 04, 2007 at 03:07:41PM -0500, MatthewLCreech at eaton.com wrote:
>I'm not sure if this is known and was accidentally left in the config,
>or if nobody has noticed yet, but the "build all sources at once" option
>is currently broken.  I noticed when updating from 1.2.2.1 to 1.3.1, as
>I enabled CONFIG_BUILD_AT_ONCE in the config, but BusyBox was still
>built in pieces.
>
>The offending change seems to be 16307, which removes pertinent code
>from the top-level Makefile.  Just FYI

That's a known missing feature due to the transition to the kbuild
infrastructure. It shouldn't be too hard to reinstate it.
I've heared that the kernel can at least build every builtin.o in IMA
mode (which is suboptimal for busybox), but didn't try this myself.

Patches welcome..