Re: [PATCH] Generalize -fuse-ld= to support absolute path or arbitrary ld.linker

[Artur Sinila <logarithmus.dev@gmail.com>]

On Mon, 2021-06-28 at 15:26 +0200, Martin Liška wrote:
> On 6/28/21 2:24 PM, Artur Sinila wrote:
> > On Mon, 2021-06-28 at 14:08 +0200, Martin Liška wrote:
> > > On 6/26/21 4:44 PM, Artur Sinila wrote:
> > > > Not so gentle ping :)
> > > > What should happen in order for this patch to be accepted?
> > > > 
> > > 
> > > Hello.
> > > 
> > > We came up to conclusion that one can use the currently supported
> > > option
> > > -fuse-ld={bfd,gold,lld} with -B that can point to an arbitrary
> > > path
> > > the such linker is expected.
> > > 
> > > Cheers,
> > > Martin
> > 
> > Hello.
> > 
> > Thank you for the reply. I'd like to use mold linker with gcc:
> > https://github.com/rui314/mold. So your solution doesn't help.
> 
> Well, kind of works. You only need to create a symlink called
> ld which will point to your linker (plus using -B argument as
> mentioned).
> 
> > 
> > There are 2 options:
> > 1. Add mold to -fuse-ld option
> > 2. Implement --ld-path
> > 
> > The 2nd option is much more future-proof: you won't need to add new
> > -fuse-ld variant each time new linker comes up. To provide some
> > context: clang had been supporting passing path to -fuse-ld, but
> > since
> > clang 12 this is deprecated in favor of new --ld-path option. I
> > think
> > we should take an example from clang and implement this useful
> > feature
> > in gcc as well.
> 
> Can you please provide a pointer for the deprecation.
> I'm adding Jakub who recommended using the -B argument.
> 
> Martin
> 
> > 
> > Cheers,
> > Artur Sinila
> > 
> 

See https://reviews.llvm.org/D83015. Speaking about -B option, AFAIK it
will make gcc to search for collect2, cc and other tools in specified
directory, so apart from creating a symlink to mold, I'll also need to
create symlinks to all those tools. Didn't try it in practice though.

Best regards,
Artur Sinila