Hi,
You may want to look at crosskit.sourceforge.net (a crosstool/buildroot-like project that I have recently started and that you can find on sourceforge). Following your e-mails, I have added sparc support. The toolchain builds fine but busybox fails to link (sched_getaffinity and sched_setaffinity undefined). If I manage to pass this issue, I will then try to build a kernel for sparc for testing with qemu-sparc. I will also add glibc support (crosskit aims at providing scripts for building packages against either uclibc or glibc).
I haven't looked at detaoib yet but it was surely created before crosskit and may therefore be a safer bet.
Regards,
Cedric Hombourger