[llvm-bugs] [Bug 48714] New: ld64.lld.darwinnew produces invalid debug info, causing lldb to err with "N_SO in symbol with UID 145239 has invalid sibling in debug map, please file a bug and attach the binary listed in this error"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48714

            Bug ID: 48714
           Summary: ld64.lld.darwinnew produces invalid debug info,
                    causing lldb to err with "N_SO in symbol with UID
                    145239 has invalid sibling in debug map, please file a
                    bug and attach the binary listed in this error"
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: MachO
          Assignee: unassignedbugs at nondot.org
          Reporter: nicolasweber at gmx.de
                CC: gkm at fb.com, jezreel at gmail.com,
                    llvm-bugs at lists.llvm.org, smeenai at fb.com

Known issue, but I figured I'd file a bug so that I can link to it. Possible
repro, extracted from https://bugs.llvm.org/show_bug.cgi?id=48657#c5 (there are
likely way smaller repros):

1. Download
https://drive.google.com/file/d/1thKfcfKUMhyJ22HRSjorIKZjH42k3bnZ/view?usp=sharing
(warning: large, 1GB compressed, 5.3GB unzipped -- but it links very quickly,
less than a second with both linkers).

2. Link as usual (`ld64.lld.darwinnew @response.txt`)

3. Run like e.g. so: `lldb -- ./mksnapshot --turbo_instruction_scheduling
--target_os=mac --target_arch=x64 --embedded_src embedded.S --embedded_variant
Default --random-seed 314159265 --startup_blob snapshot_blob.bin
--native-code-counters --verify-heap`

When loading the lld-linked binary into lldb, it prints many lines looking like

error: mksnapshot N_SO in symbol with UID 145239 has invalid sibling in debug
map, please file a bug and attach the binary listed in this error

This doesn't happen with ld.


(Once this is fixed, debug info isn't terribly useful without the actual source
files somewhere. Due to
https://blog.llvm.org/2019/11/deterministic-builds-with-clang-and-lld.html one
has to run `settings set target.source-map ../.. actual/local/path/to/src` in
lldb even if src files are available locally somewhere.)

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