kernel: copy defconfig to {B} vs {S}

For kernel's that use a split source/object build the copy
of defconfig to {S} in the base kernel class is problematic.
The previous solution for this was to override the do_configure
of the base kernel class in a subclass. While this is still
a viable/valid option, it does mean that changes to the base
do_configure will be missed.

The solution to this is to copy a defconfig to {B} which is
typically the same as {S}, so most kernel recipes won't see or
care about this change.

With this change in place, linux-yocto.bbclass can drop its
override of do_configure.

Tested with linux-yocto and oe linux recipes.

(From OE-Core rev: 4f03d922ce32f602a5a407cf422d82a0d036e4a0)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 2e36e86eb8..9c492a3ecc 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -181,8 +181,8 @@ sysroot_stage_all_append() {
 kernel_do_configure() {
         # Copy defconfig to .config if .config does not exist. This allows
         # recipes to manage the .config themselves in do_configure_prepend().
-        if [ -f "${WORKDIR}/defconfig" ] && [ ! -f "${S}/.config" ]; then
-                cp "${WORKDIR}/defconfig" "${S}/.config"
+        if [ -f "${WORKDIR}/defconfig" ] && [ ! -f "${B}/.config" ]; then
+                cp "${WORKDIR}/defconfig" "${B}/.config"
         fi
         yes '' | oe_runmake oldconfig