On Sat, Mar 27, 2021 at 12:25 AM Denys Dmytriyenko [off-list ref] wrote:

Hi, Bruce,

Would you mind taking a look at this? Have you seen any issues building latest
kernel 5.12-rc for aarch64 and seeing host objcopy being used instead of cross
compile one? Please let us know. Thanks!

I've been able to build and boot all arches on v5.12-rc4, and I did
run into something similar on 5.4 kernel's, but it was addressed in
-stable backports.

That being said, let me test this over the next couple of days and
follow up. I may not have had Ross' changes in my tree when I was
sanity testing 5.12.

Bruce

--
Denys


On Thu, Mar 25, 2021 at 08:13:04PM -0500, Nishanth Menon wrote:

quoted

When cross-compiling with v5.12-rc3, prepare fails[1] build of vdso at
the objcopy stage since it seems to be using the local host's objcopy
rather than the cross-compile version we want it to use.

This can be trivially reproduced in a localbuild of the kernel
following the build parameters provided in the process[2]

Lets fix this by passing OBJCOPY over to the kernel.

[1] https://pastebin.ubuntu.com/p/pNcQtb93wr/
[2] https://pastebin.ubuntu.com/p/vZGqgh9Sq5/
Signed-off-by: Nishanth Menon <nm@ti.com>
---

NOTE:
1. This is a different problem and is not resolved with
https://lists.openembedded.org/g/openembedded-core/message/149943

2. Though reproduced during a dunfell build, this should probably
apply else where as well.

3. I have'nt been able to cleanly bisect things, but my best guess was
that this might be a consequence of kernel fixup exposing this.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a5b8ca97fbf8300a5e21c393df25ce6f521e7939

 meta/classes/kernel-arch.bbclass                             | 3 +++
 meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/meta/classes/kernel-arch.bbclass b/meta/classes/kernel-arch.bbclass
index 07ec242e63bb..3d25fc7ac531 100644
--- a/meta/classes/kernel-arch.bbclass
+++ b/meta/classes/kernel-arch.bbclass

@@ -60,9 +60,12 @@ TARGET_LD_KERNEL_ARCH ?= ""
 HOST_LD_KERNEL_ARCH ?= "${TARGET_LD_KERNEL_ARCH}"
 TARGET_AR_KERNEL_ARCH ?= ""
 HOST_AR_KERNEL_ARCH ?= "${TARGET_AR_KERNEL_ARCH}"
+TARGET_OBJCOPY_KERNEL_ARCH ?= ""
+HOST_OBJCOPY_KERNEL_ARCH ?= "${TARGET_OBJCOPY_KERNEL_ARCH}"

 KERNEL_CC = "${CCACHE}${HOST_PREFIX}gcc ${HOST_CC_KERNEL_ARCH} -fuse-ld=bfd ${DEBUG_PREFIX_MAP} -fdebug-prefix-map=${STAGING_KERNEL_DIR}=${KERNEL_SRC_PATH}"
 KERNEL_LD = "${CCACHE}${HOST_PREFIX}ld.bfd ${HOST_LD_KERNEL_ARCH}"
 KERNEL_AR = "${CCACHE}${HOST_PREFIX}ar ${HOST_AR_KERNEL_ARCH}"
+KERNEL_OBJCOPY = "${CCACHE}${HOST_PREFIX}objcopy ${HOST_OBJCOPY_KERNEL_ARCH}"
 TOOLCHAIN = "gcc"

diff --git a/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb b/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb
index 87b7d240f51a..2d73e8093c2e 100644
--- a/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb
+++ b/meta/recipes-kernel/make-mod-scripts/make-mod-scripts_1.0.bb

@@ -25,7 +25,7 @@ EXTRA_OEMAKE = " HOSTCC="${BUILD_CC} ${BUILD_CFLAGS} ${BUILD_LDFLAGS}" HOSTCPP="
 do_configure() {
      unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS
      for t in prepare scripts_basic scripts; do
-             oe_runmake CC="${KERNEL_CC}" LD="${KERNEL_LD}" AR="${KERNEL_AR}" \
+             oe_runmake CC="${KERNEL_CC}" LD="${KERNEL_LD}" AR="${KERNEL_AR}" OBJCOPY="${KERNEL_OBJCOPY}"\
              -C ${STAGING_KERNEL_DIR} O=${STAGING_KERNEL_BUILDDIR} $t
      done
 }
--

2.31.0

--
- Thou shalt not follow the NULL pointer, for chaos and madness await
thee at its end
- "Use the force Harry" - Gandalf, Star Trek II