[llvm-dev] [cfe-dev] Feedback on feature (and status of lld linker script support?)

[Shoaib Meenai via llvm-dev]

For ld64.lld, we're aiming to be compatible with ld64 (the standard platform linker for Apple). ld64 doesn't support linker scripts, and we had no plans of supporting them either.

I'd be super reluctant to add support for linker scripts unless there's a very compelling use case for them. They add a lot of complication to the linker, and my understanding is that many aspects of them are ill-defined (bfd, gold, and LLD might do different things for the same input linker script). There's also no precedent of linker script support for Apple platforms that I'm aware of.

(llvm-dev is the right mailing list for LLD discussions, so I moved this to llvm-dev and BCC'd cfe-dev.)

On 11/29/21, 8:04 PM, "cfe-dev on behalf of Christopher Friedt via cfe-dev" <cfe-dev-bounces at lists.llvm.org on behalf of cfe-dev at lists.llvm.org> wrote:

    On Mon, Nov 29, 2021 at 3:33 PM David Blaikie <dblaikie at gmail.com> wrote:
    > The section name hashing might be more of a clang feature than an LLVM one - if it's specifically for user-specified sections, etc. It could have some overlap with some symbol name length issues I've been considering for a while with somewhat similar strategies (hash, but then have a lookup table). I'm not sure who's going to be best to actually make the final call on whether what you're proposing is suitable for Clang/LLVM

    Good to know that I'm not the only one thinking about this stuff,
    hehe. I was planning on using it for user-specified sections, yea.

    Hopefully this or something like it could be upstreamed. It's not
    ideal because it's only hiding the root problem (the Mach-O spec) but
    at least it's a short term solution.

    Almost as critical, imho, is supporting GNU linker scripts with LLD
    for macOS. What are the main limiting factors right now preventing
    ld64.lld from borrowing most of the GNU linker script support from
    ld.lld? Or is that a conversation for a different mailing list?

    Thanks for your response,

    C
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