Re: [PATCH 1/2] powerpc/vmlinux.lds: Explicitly retain .gnu.hash

Alan Modra [off-list ref] writes:

On Thu, Feb 27, 2020 at 03:59:32PM +1100, Michael Ellerman wrote:

quoted

Relocatable kernel builds produce a warning about .gnu.hash being an
orphan section:

  ld: warning: orphan section `.gnu.hash' from `linker stubs' being placed in section `.gnu.hash'

If we try to discard it the build fails:

  ld -EL -m elf64lppc -pie --orphan-handling=warn --build-id -o
    .tmp_vmlinux1 -T ./arch/powerpc/kernel/vmlinux.lds --whole-archive
    arch/powerpc/kernel/head_64.o arch/powerpc/kernel/entry_64.o
    ...
    sound/built-in.a net/built-in.a virt/built-in.a --no-whole-archive
    --start-group lib/lib.a --end-group
  ld: could not find section .gnu.hash

So add an entry to explicitly retain it, as we do for .hash.

Looks fine to me.  You can also pass --hash-style=sysv to ld (since
binutils-2.18) to disable generation of .gnu.hash.

Our current minimum is 2.21, so that's probably 5-10 years away :)

cheers