[lld] r249520 - Don't create dynamic relocations for weak undefined symbols.

[Rafael Espíndola via llvm-commits]

>> Tmpfs. Both input and output. I also used thin archives.
>
>  Can I enable that in LLVM? Is it beneficial?
>
> (does gold support thin archives? (is it an apples-to-apple-like-objects
comparison, I guess?))

Yes, I used the same inputs for both.  To get thin archives, pass the T
option to ar or llvm-ar.

>
> Ah, rightio. Hmm - guess I can move lld out of the way while I'm
self-hosting, until that's implemented.
>
> Do I have to do something to opt-in to ELF2?

Use the ld.lld2 symbolic link.

Cheers,
Rafael
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