Unable to build on darwin due to LLVM object discrepancy

[earentir]

issue:

earentir@air edit % cargo build --config .cargo/release.toml --release
   Compiling edit v1.2.1 (/Users/earentir/projects/edit)
error: linking with `cc` failed: exit status: 1
  |
  = note:  "cc" "<1 object files omitted>" "/Users/earentir/projects/edit/target/release/deps/libcompiler_builtins-9174c54a2f22f98a.rlib" "-liconv" "-lSystem" "-lc" "-lm" "-arch" "arm64" "-mmacosx-version-min=11.0.0" "-o" "/Users/earentir/projects/edit/target/release/deps/edit-380b87e122b3dcaf" "-Wl,-dead_strip" "-nodefaultlibs"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: ld: could not parse bitcode object file /Users/earentir/projects/edit/target/release/deps/libcompiler_builtins-9174c54a2f22f98a.rlib(compiler_builtins-9174c54a2f22f98a.compiler_builtins.2d1910a3e3825075-cgu.0.rcgu.o): 'Unknown attribute kind (102) (Producer: 'LLVM21.1.0-rust-1.91.0-nightly' Reader: 'LLVM APPLE_1_1700.0.13.5_0')', using libLTO version 'LLVM version 17.0.0' in '/Users/earentir/projects/edit/target/release/deps/libcompiler_builtins-9174c54a2f22f98a.rlib(compiler_builtins-9174c54a2f22f98a.compiler_builtins.2d1910a3e3825075-cgu.0.rcgu.o)'
          clang: error: linker command failed with exit code 1 (use -v to see invocation)


error: could not compile `edit` (bin "edit") due to 1 previous error

because we are on nightly the llvm used for the objects we pull through rustup are build with a way newer LLVM, in order to build (1.2.1 at least) on 15.6.1 you will need to disable LTO+bitcode

[profile.release]
lto = false
codegen-units = 1

[target.aarch64-apple-darwin]
rustflags = ["-Cembed-bitcode=no"]

[lhecker]

Unfortunately, I don't own a macOS device to routinely test this project with. Thanks for sharing a workaround!

[earentir]

No issue, I just wanted to test it out on darwin, I actually use it in fedora at home and debian at work which obviously builds perfectly fine since they are not stuck with an ancient LLVM.