--- Comment #8 from Ard Biesheuvel <ard.biesheuvel at linaro dot org> ---
(In reply to Andrew Pinski from comment #7)
> (In reply to Matthias Klose from comment #6)
> > systemd on aarch64 configured with efi support fails with a similar
> > relocation error:
> > 
> > ld -o src/boot/efi/ -T /usr/lib/ -shared
> > -Bsymbolic -nostdlib -znocombreloc -L /usr/lib /usr/lib/crt0-efi-aarch64.o
> > --defsym=EFI_SUBSYSTEM=0xa src/boot/efi/disk.c.o src/boot/efi/graphics.c.o
> > src/boot/efi/measure.c.o src/boot/efi/pe.c.o src/boot/efi/util.c.o
> > src/boot/efi/boot.c.o src/boot/efi/console.c.o src/boot/efi/shim.c.o -lefi
> > -lgnuefi /usr/lib/gcc/aarch64-linux-gnu/7/libgcc.a
> > ld: /usr/lib/crt0-efi-aarch64.o: relocation R_AARCH64_ABS16 against
> > `EFI_SUBSYSTEM' can not be used when making a shared object
> This is a bug in either in gnu-efi or systemd.  EFI_SUBSYSTEM is in the
> pe-coff header so we don't want any relocation there :).  Basically
> EFI_SUBSYSTEM is not being defined.  Note Uboot has a similar bug too.

The PE/COFF header is part of the static GNU=EFI library, and uses a static
relocation to populate the efi subsystem field when incorporated into a EFI
executable. The ELF spec allows this, so if there is a bug here, it is in
ld.bfd not in GNU-EFI, systemd or u-boot.

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