-Ur option documentation

[Fangrui Song]

On Mon, May 8, 2023 at 3:47 AM Florian Weimer via Binutils
<binutils@sourceware.org> wrote:
>
> * Andreas Schwab:
>
> > On Mai 05 2023, Florian Weimer via Binutils wrote:
> >
> >> The manual says this:
> >>
> >> '-Ur'
> >>      For anything other than C++ programs, this option is equivalent to
> >>      '-r': it generates relocatable output--i.e., an output file that
> >>      can in turn serve as input to 'ld'.  When linking C++ programs,
> >>      '-Ur' _does_ resolve references to constructors, unlike '-r'.  It
> >>      does not work to use '-Ur' on files that were themselves linked
> >>      with '-Ur'; once the constructor table has been built, it cannot be
> >>      added to.  Use '-Ur' only for the last partial link, and '-r' for
> >>      the others.
> >>
> >> For ELF, this refers to the legacy init function, right?
> >
> > No, it refers to the a.out N_SETx symbols.
>
> So this doesn't matter to ELF at all?  Would it be possible to update
> the documentation accordingly?
>
> Thanks,
> Florian
>

Anecdotally, -Ur may be so obscure that nearly no project uses. ld.lld
doesn't implement this option and I haven't heard of any distribution
using ld.lld having broken packages due to -Ur...