linker problem with Ubuntu 18.04 tool chain: unknown architecture of input file `arch/arm64/boot/vmlinuz.o' is incompatible with aarch64 output

[Lukas Bulwahn]

Dear Ard,

with my Ubuntu 18.04 arm gcc tool chain, I encounter this linker error
in my allyesconfig build:

 LD      arch/arm64/boot/vmlinuz.efi.elf
aarch64-linux-gnu-ld: unknown architecture of input file
`arch/arm64/boot/vmlinuz.o' is incompatible with aarch64 output
drivers/firmware/efi/libstub/Makefile.zboot:41: recipe for target
'arch/arm64/boot/vmlinuz.efi.elf' failed
make[1]: *** [arch/arm64/boot/vmlinuz.efi.elf] Error 1
arch/arm64/Makefile:173: recipe for target 'vmlinuz.efi' failed
make: *** [vmlinuz.efi] Error 2

I bisected it back to happen since commit c37b830fef13 ("arm64: efi:
enable generic EFI compressed boot"), and it still appears with the
latest next-20230113 (on linux-next, I have to remove DRM_MSM as it
currently comes with a build error).

The specific compiler and linker versions on my system are:

$ aarch64-linux-gnu-ld --version
GNU ld (GNU Binutils for Ubuntu) 2.30

$ aarch64-linux-gnu-gcc --version
aarch64-linux-gnu-gcc (Ubuntu/Linaro 7.5.0-3ubuntu1~18.04) 7.5.0


IMHO, I run pretty standard commands:
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j 32 mrproper
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j 32 allyesconfig
make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j 32 all

Let me know if you need more information.


Best regards,

Lukas