Bug 771324

Summary:	kernel-build.eclass: use SYSROOT for configs
Product:	Gentoo Linux	Reporter:	David Michael <fedora.dm0>
Component:	Eclasses	Assignee:	Distribution Kernel Project <dist-kernel>
Status:	CONFIRMED ---
Severity:	normal	CC:	dist-kernel
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description David Michael 2021-02-18 18:23:55 UTC

The eclass takes config fragments from BROOT:

https://github.com/gentoo/gentoo/blob/master/eclass/kernel-build.eclass#L220

This uses the same config files for the native system and cross-compiled kernels.  I think it should search SYSROOT for these build-time files, which allows for different configs for different targets.

I'm not sure the best way to express the path, maybe it has to do something like this to account for empty SYSROOT but nonempty EPREFIX:

test -n "${SYSROOT}" &&
local user_configs=( "${ESYSROOT}"/etc/kernel/config.d/*.config ) ||
local user_configs=( "${BROOT}"/etc/kernel/config.d/*.config )