error: -mpreferred-stack-boundary=2 is not between 4 and 12 - during buildkernel on amd64

[Matthew Dillon]

    The build system is a bit convoluted with regards to cross-building.
    x86_64 can't build i386 binaries with the standard make lines for
    the same reason that i386 can't build x86_64 with the standard make
    line.

    All the information needed is in the configuration files but the
    make system doesn't deal with it properly because it really has
    to re-exec itself with the proper make line (for each target).

    An example of working cross-build parameters can be found in e.g.
    /usr/src/test/x86_64/Makefile (for i386 cross building x86_64).

    I've never tried x86_64 cross-building to i386 though.

						-Matt