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linux kernel question: are smp kernels 64 bit? by cokish2007-07-03 13:20:10
  smp and 64-bit are independent. by sgrunt2007-07-03 13:23:46
    i686 by cokish2007-07-03 13:54:50
      It's in... by Sharku2007-07-03 14:03:21
        Is it possibly sources-dependant? by romandas2007-07-03 14:19:35
          I think gentoo-sources do that. by Sharku2007-07-03 14:39:23
            Aha! Found it. by Sharku 2007-07-03 14:59:11
It's in /usr/portage/eclass/kernel-2.eclass

detect_arch() {
# This function sets ARCH_URI and ARCH_PATCH
# with the neccessary info for the arch sepecific compatibility
# patchsets.

local ALL_ARCH LOOP_ARCH COMPAT_URI i

# COMPAT_URI is the contents of ${ARCH}_URI
# ARCH_URI is the URI for all the ${ARCH}_URI patches
# ARCH_PATCH is ARCH_URI broken into files for UNIPATCH

ARCH_URI=""
ARCH_PATCH=""
ALL_ARCH="ALPHA AMD64 ARM HPPA IA64 M68K MIPS PPC PPC64 S390 SH SPARC X86"

for LOOP_ARCH in ${ALL_ARCH}; do
COMPAT_URI="${LOOP_ARCH}_URI"
COMPAT_URI="${!COMPAT_URI}"

[[ -n ${COMPAT_URI} ]] && \
ARCH_URI="${ARCH_URI} $(echo ${LOOP_ARCH} | tr '[:upper:]' '[:lower:]')? ( ${COMPAT_URI} )"

if [[ ${LOOP_ARCH} == "$(echo $(tc-arch-kernel) | tr '[:lower:]' '[:upper:]')" ]]; then
for i in ${COMPAT_URI}; do
ARCH_PATCH="${ARCH_PATCH} ${DISTDIR}/${i/*\//}"
done
fi
done
}

What I can make of this is that the function loops over all of the possible archs until it finds your specific arch as set in make.defaults. It then downloads and applies different patchsets according to what it finds, so that would explain why you only have the 64 bit options, whereas I (using vanilla) have a whole lot more.
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