[llvm-dev] Contributing LLD for Mach-O

David Blaikie via llvm-dev
Sat, 29 Feb 2020 22:14:45 -0000

Awesome :) out of curiosity, are there any particular
features/characteristics/benefits you're hoping for compared to the MacOS
system linker?

On Fri, Feb 28, 2020 at 1:32 PM Shoaib Meenai via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi all,
>
> We’re planning to contribute a new implementation of LLD for Mach-O, using
> the same design as the COFF and ELF ports. This design has proven to work
> very well for those ports, and we’re keen to explore it for Mach-O as well.
> Our work is based on an initial prototype created by Peter Collingbourne
> and Rui Ueyama.
>
> Our initial commit is up for review at https://reviews.llvm.org/D75382.
> We’ve intentionally stripped down this initial commit as much as possible
> to ease reviewing; we’ve kept it to the absolute minimum needed to produce
> and test a working macOS x86-64 executable for that prints “Hello World”
> via a syscall. We have several short-term follow-ups planned to add
> important functionality, such as linking against archives, universal
> binaries, dylibs, and tbd files, performing subsection splitting
> (atomization), and producing dylibs. The follow-ups should give a good
> sense of the overall design while still keeping each piece easily
> reviewable and testable individually. Our end goal is to create a
> full-featured Mach-O linker, and we’ll be working toward that goal over the
> next several months (and years, in all likelihood). We’d appreciate
> feedback and reviews.
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