Hi Masahiro,
My distribution recently updated their version of make to 4.4 from 4.3,
after which I notice the following error from nm when building ARCH=arm
kernels, which I thought that this was supposed to be resolved with
commit 3ec8a5b33dea ("kbuild: do not export LDFLAGS_vmlinux") but the
tree clearly has this and it is not visible while just running clean (I
have to build zImage to see it):
$ git show -s --format='%h ("%s")'
512dee0c00ad ("Merge tag 'x86-urgent-2023-01-04' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip")
$ make --version | head -1
GNU Make 4.4
$ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- O=build defconfig zImage
arm-linux-gnueabi-nm: 'arch/arm/boot/compressed/../../../../vmlinux': No such file
vs.
$ make --version | head -1
GNU Make 4.3
$ make -skj"$(nproc)" ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- O=build defconfig zImage
I bisected make to see what change causes this and I landed on
commit 98da874c ("[SV 10593] Export variables to $(shell ...)
commands") [1], which certainly seems like a reasonable commit to
blame but I am not sure how exactly it factors in here.
If you need any more information on reproducing this, I am happy to
provide it (CROSS_COMPILE is just the toolchains from kernel.org).
[1]: https://git.savannah.gnu.org/cgit/make.git/commit/?id=98da874c43035a490cdca81331724f233a3d0c9a
Cheers,
Nathan
