According to the documentation in https://wiki.gentoo.org/wiki/Genkernel the first time genkernel is run for a new sources it takes kernel configuration file from `usr/share/genkernel/arch/x86_64/kernel-config` with the location overridable by `DEFAULT_KERNEL_CONFIG` option. This is really not the case, if you check `/usr/share/genkernel/gen_configkernel.sh` you will see that function `determine_config_file`: determine_config_file() { for f in \ "${CMD_KERNEL_CONFIG}" \ "/etc/kernels/kernel-config-${ARCH}-${KV}" \ "${GK_SHARE}/arch/${ARCH}/kernel-config-${KV}" \ "${GK_SHARE}/arch/${ARCH}/kernel-config-${VER}.${PAT}" \ "${GK_SHARE}/arch/${ARCH}/generated-config" \ "${GK_SHARE}/arch/${ARCH}/kernel-config" \ "${DEFAULT_KERNEL_CONFIG}" \ ; do if [ -n "${f}" -a -f "${f}" ] then if ! grep -sq THIS_CONFIG_IS_BROKEN "$f" then KERNEL_CONFIG="$f" && break fi fi done if [ -z "${KERNEL_CONFIG}" ] then gen_die 'Error: No kernel .config specified, or file not found!' fi KERNEL_CONFIG="$(readlink -f "${KERNEL_CONFIG}")" # Validate the symlink result if any if [ ! -f "${KERNEL_CONFIG}" ] then gen_die "Error: No kernel .config: symlinked file not found! ($KERNEL_CONFIG)" fi } has `"${DEFAULT_KERNEL_CONFIG}"` listed *after* `"${GK_SHARE}/..."` and breaks once configuration is found, so given that all `kernel-config` files in `/usr/share` are installed by `genkernel` package and they do have `kernel-config` function will never check for `${DEFAULT_KERNEL_CONFIG}` unless you try to use unknown arch. I think that line with `${DEFAULT_KERNEL_CONFIG}` must be moved before all lines with `${GK_SHARE}`.
Yes and no: Current genkernel makes it impossible to force default cfg but in normal cases, DEFAULT_KERNEL_CONFIG should be last resort. Pending genkernel v4 will do > [...] > local -a kconfig_candidates > kconfig_candidates+=( "${GK_SHARE}/arch/${ARCH}/kernel-config-${KV}" ) > kconfig_candidates+=( "${GK_SHARE}/arch/${ARCH}/kernel-config-${VER}.${PAT}" ) > kconfig_candidates+=( "${GK_SHARE}/arch/${ARCH}/generated-config" ) > kconfig_candidates+=( "${GK_SHARE}/arch/${ARCH}/kernel-config" ) > kconfig_candidates+=( "${DEFAULT_KERNEL_CONFIG}" ) > > if [ -n "${CMD_KERNEL_CONFIG}" -a "${CMD_KERNEL_CONFIG}" = "default" ] > then > print_info 1 "Default configuration was forced. Will ignore any user kernel configuration!" > else > kconfig_candidates=( "/etc/kernels/kernel-config-${ARCH}-${KV}" ${kconfig_candidates[@]} ) > fi > [...]
v4 containing the changes was release long time ago.
