Hi Nick,

On Wed, Mar 1, 2023 at 8:41 AM Nick Clifton <nickc@redhat.com> wrote:

> Hi Tom,
>
> > I have noticed that the LLVM linker will add something to the .comment
> > section of binaries it produces for the version of lld used to produce an
> > ELF executable or shared library.
>
> Does it ?  I do not see this:
>
>     % clang hello.c
>     % readelf -p.comment a.out
>
>    String dump of section '.comment':
>      [     0]  GCC: (GNU) 12.2.1 20221121 (Red Hat 12.2.1-4)
>      [    2e]  GCC: (GNU) 12.0.1 20220413 (Red Hat 12.0.1-0)
>      [    5c]  clang version 14.0.5 (Fedora 14.0.5-2.fc36)
>

Ahh, sorry for the confusion.  I am using GCC forcing the use of LLD

 $ /opt/gcc-12.1.0/bin/gcc -B /opt/lld-14.0.6/bin -fuse-ld=lld -o wchar
wchar.c



$ /opt/binutils-2.39/bin/readelf -p .comment wchar



String dump of section '.comment':

  [     0]  GCC: (GNU) 4.8.5 20150623 (Red Hat 4.8.5-39)

  [    2d]  Linker: LLD 14.0.6

  [    40]  GCC: (GNU) 12.1.0



>
> So there is a note for the version of Clang, but not one for the version
> of lld.
> Maybe this is a new feature ?  I am using  clang/llvm/lld version 14.0.5.
>
>
> > For the gold liker, I see I can do a readelf -p .note.gnu.gold-version
> and
> > get the version of gold used to make an ELF file.
>
> Again I do not see this:
>
>    % gcc hello.c -fuse-ld=gold
>    % readelf -p.comment a.out
>
>
The gold version is in a different section

$ /opt/gcc-12.1.0/bin/gcc -B /opt/binutils-2.39/bin -fuse-ld=gold -o wchar
wchar.c



$ /opt/binutils-2.39/bin/readelf -p .note.gnu.gold-version wchar



String dump of section '.note.gnu.gold-version':

  [     c]  GNU

  [    10]  gold 1.16

    String dump of section '.comment':

>      [     1]  GCC: (GNU) 12.2.1 20221121 (Red Hat 12.2.1-4)
>      [    2f]  GCC: (GNU) 12.0.1 20220413 (Red Hat 12.0.1-0)
>
> >  I see nothing similar for the BFD linker.
>
> True - this feature is not currently supported.
>
> > So the request for enhancement is to add something to the .comment
> section
> > as to which version of the BFD or gold linker was used to produce the
> ELF.
> >
> > I can file a BZ if that is the preferred way of receiving a request such
> as
> > this.
>
> It is, so please do file a BZ.  If you can include a reproducer that would
> help.
>

OK, I'll do so, with simple "hello world!" code and the commands I am
using, as
above.

Thanks,

Tom