[PATCH, BFD, AArch64, x86] Improve warning for --force-bti.

[H.J. Lu]

On Tue, Apr 2, 2019 at 2:05 AM Sudakshina Das <Sudi.Das@arm.com> wrote:
>
> Hi HJ
>
> On 01/04/2019 20:26, H.J. Lu wrote:
> > On Thu, Mar 21, 2019 at 9:25 AM Sudakshina Das <Sudi.Das@arm.com> wrote:
> >>
> >> Hi Nick
> >>
> >> On 21/03/2019 15:14, Nick Clifton wrote:
> >>> Hi Sudi,
> >>>
> >>>> *** bfd/ChangeLog ***
> >>>>
> >>>> 2019-xx-xx  Sudakshina Das  <sudi.das@arm.com>
> >>>>
> >>>>       * elf-bfd.h (struct elf_backend_data): Add argument to
> >>>>       merge_gnu_properties.
> >>>>       * elf-properties.c (elf_merge_gnu_properties): Add argument to
> >>>>       itself and while calling bed->merge_gnu_properties.
> >>>>       (elf_merge_gnu_property_list): Update the calls for
> >>>>       elf_merge_gnu_properties.
> >>>>       * elfnn-aarch64.c (elfNN_aarch64_merge_gnu_properties): Update handling
> >>>>       of --force-bti warning and add argument.
> >>>>       * elfxx-aarch64.c (_bfd_aarch64_elf_link_setup_gnu_properties): Add
> >>>>       warning.
> >>>>       * elfxx-x86.c (_bfd_x86_elf_merge_gnu_properties): Add argument.
> >>>>       * elfxx-x86.h (_bfd_x86_elf_merge_gnu_properties): Likewise in
> >>>>       declaration.
> >>>>
> >>>> *** ld/ChangeLog ***
> >>>>
> >>>> 2019-xx-xx  Sudakshina Das  <sudi.das@arm.com>
> >>>>
> >>>>       * testsuite/ld-aarch64/aarch64-elf.exp: Add new test.
> >>>>       * testsuite/ld-aarch64/bti-plt-1.s: Add .ifdef for PAC note section.
> >>>>       * testsuite/ld-aarch64/bti-plt-6.d: Update warning.
> >>>>       * testsuite/ld-aarch64/bti-plt-7.d: Likewise.
> >>>>       * testsuite/ld-aarch64/bti-warn.d: New test.
> >>>
> >>> Approved - please apply.
> >>
> >> Thanks for the approval. Committed as
> >> 4e5391148d51c58785aad637f1a92d47b91b3ae6
> >>
> >> Sudi
> >>
> >
> > Isn't  --force-bti for ELF only? Shouldn't it use "-z force-bti"?
>
> Sorry I was not aware of any elf specific meaning given to -z. Is this a
> convention? I can not seem to find any particular documentation for it.
>

This is the convention.  See how PARSE_AND_LIST_ARGS_CASE_Z
is used.  You can also define PARSE_AND_LIST_OPTIONS to update
"ld --help".

-- 
H.J.