[llvm-dev] [cfe-dev] LLD to be the default linker in Clang

[Rui Ueyama via llvm-dev]

On Fri, Oct 28, 2016 at 10:12 AM, Ed Maste via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> On 28 October 2016 at 16:54, Renato Golin via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > On 28 October 2016 at 17:41, Hans Wennborg <hans at chromium.org> wrote:
> >> There's also -fuse-ld=
> >>
> >> That's how I usually do it.
> >
> > Right, that gets rid of the override flag. Thanks! :)
> >
> > But the arguments about the default and the cross-compilation error
> still stand.
>
> It should be possible to search the path for ld.lld first, then ld,
> but to me it seems like it will just be more confusing.  Also AFAIK
> the -fuse-ld flag has no way to specify plain ld, although we could
> allow -fuse-ld= to specify that.
>

IIUC, you can pass a full path to -fuse-ld, so -fuse-ld=`which ld` should
specify the default ld.

Clang's current approach (ld from $PATH by default, or ld.arg from
> -fuse-ld=arg) suits us in FreeBSD. Today we have:
>     /usr/bin/ld.bfd (GNU ld 2.17.50)
>     /usr/bin/ld (ld.bfd symlink)
>
> We'll soon add
>     /usr/bin/ld.lld
> and in fact we'll want the default to remain /usr/bin/ld until we're
> confident lld is a suitable replacement for all cases. At that point
> we'll change the ld symlink to ld.lld.
>
> Installing the binutils port adds:
>
> /usr/local/bin/ld.bfd
> /usr/local/bin/ld.gold
> /usr/local/bin/ld (/usr/local/bin/ld.bfd hardlink)
>
> The only downside of -fuse-ld= that I'm aware of affects GCC only, not
> Clang: GCC accepts only -fuse-ld=bfd and -fuse-ld=gold, and Davide's
> patch to add -fuse-ld=lld was met with hostility. But that shouldn't
> have any effect on Clang.
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