[all-commits] [llvm/llvm-project] 8bea91: [lld-macho] Support archives without index (#132942)

[Leonard Grey via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8bea91f677be4a05b1256a8052ab84dcd7ccb050
      https://github.com/llvm/llvm-project/commit/8bea91f677be4a05b1256a8052ab84dcd7ccb050
  Author: Leonard Grey <lgrey at chromium.org>
  Date:   2025-04-10 (Thu, 10 Apr 2025)

  Changed paths:
    M lld/MachO/Driver.cpp
    M lld/MachO/InputFiles.cpp
    M lld/MachO/InputFiles.h
    A lld/test/MachO/archive-no-index.ll
    A lld/test/MachO/archive-no-index.s
    R lld/test/MachO/invalid/archive-no-index.s

  Log Message:
  -----------
  [lld-macho] Support archives without index (#132942)

This is a ~port of https://reviews.llvm.org/D117284. Like in that
change, archives without indices are treated as a collection of lazy
object files (as in `--start-lib/--end-lib`)

Porting the ELF follow-up to convert *all* archives to the lazy object
code path (https://reviews.llvm.org/D119074) is a natural next step, but
we would need to ensure the assertions about memory use hold for Mach-O.

NB: without an index, we can't do the part of the `-ObjC` scan where we
check for Objective-C symbols directly. We *can* still check for
`__obcj` sections so I wonder how much of a problem this actually is,
since I'm not sure how the "symbols but no sections" case can appear in
the wild.



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