warning: could not find referenced DIE when compiling on macOS

[djc]

I just did some of my first compiles with 1.50.0 and I'm getting these warnings:

  = note: warning: could not find referenced DIE
          note: while processing /Users/djc/src/bolt/rust/target/release/deps/build_index.build_index.cf635v6f-cgu.15.rcgu.o
          warning: could not find referenced DIE
          note: while processing /Users/djc/src/bolt/rust/target/release/deps/build_index.build_index.cf635v6f-cgu.15.rcgu.o
          warning: could not find referenced DIE
          note: while processing /Users/djc/src/bolt/rust/target/release/deps/build_index.build_index.cf635v6f-cgu.15.rcgu.o
          warning: could not find referenced DIE
          note: while processing /Users/djc/src/bolt/rust/target/release/deps/build_index.build_index.cf635v6f-cgu.15.rcgu.o

This was after running cargo run --release --bin build-index -- version in my (proprietary) project on macOS (Big Sur 11.2.1).

djc-2019 IDS-326/build-index-version rust $ cargo version
cargo 1.50.0 (f04e7fab7 2021-02-04)

I suspect this may have something to do with the split debuginfo stuff?

[djc]

For what it's worth, this workspace has the following configuration:

[profile.release]
debug = true
lto = true

I also see warnings like this:

          warning: inconsistent range data.
          note: while processing emitting debug_ranges
          warning: inconsistent range data.
          note: while processing emitting debug_ranges
          warning: inconsistent range data.
          note: while processing emitting debug_ranges
          warning: inconsistent range data.
          note: while processing emitting debug_ranges
          warning: inconsistent range data.
          note: while processing emitting debug_ranges
          warning: no mapping for range.

[ehuss]

Transferring to rust-lang/rust, since this looks like a linking issue. Split-debuginfo is in 1.51, not 1.50.

Some more information may be helpful. Which version of xcode are you using? What is dsymutil --version? Does it happen with LTO disabled? Does it happen with "thin" LTO?

Looking at other users reporting similar things, this sounds like maybe some issue with rustc's version of LLVM doing something incompatible with dsymutil, though I'm not sure.

[djc]

I have Xcode "Version 12.4 (12D4e)".

djc-2019 ~ $ dsymutil --version
Apple LLVM version 11.0.0 (clang-1100.0.33.12)
  Optimized build.
  Default target: x86_64-apple-darwin20.3.0
  Host CPU: skylake

If I don't enable lto, I don't see these warnings. If I set lto to thin, I also don't see these warnings.

[DianQK]

#111167 should have fixed this.