Build fails on armv7: Invalid attribute group entry (Producer: 'LLVM19.1.7-rust-1.86.0-stable' Reader: 'LLVM 18.1.6')

[yurivict]

Build of the nushell project fails on armv7:

  = note: ld: error: /wrkdirs/usr/ports/shells/nushell/work/target/release/deps/libnu_explore-86352eedad260480.rlib(nu_explore-86352eedad260480.nu_explore.1c17d43c8d09c5dd-cgu.00.rcgu.o): Invalid attribute group entry (Producer: 'LLVM19.1.5-rust-1.84.0-stable' Reader: 'LLVM 18.1.5')
          cc: error: linker command failed with exit code 1 (use -v to see invocation)

log

This is possibly because the system compiler is based on clang-19 but rust uses the bundled llvm-18.
This problem doesn't happen on any other architectures.

$ rustc --version --verbose
rustc 1.86.0 (05f9846f8 2025-03-31) (built from a source tarball)
binary: rustc
commit-hash: 05f9846f893b09a1be1fc8560e33fc3c815cfecb
commit-date: 2025-03-31
host: x86_64-unknown-freebsd
release: 1.86.0
LLVM version: 19.1.7

FreeBSD 14.1

[nikic]

This is possibly because the system compiler is based on clang-19 but rust uses the bundled llvm-18.

Based on the error message, it's the other way around. Rust is using LLVM 19, while Clang is on LLVM 18. That's generally not a problem, but you are explicitly asking for cross-language LTO (-C linker-plugin-lto in the build log), in which case you need to ensure the versions are compatible.

[yurivict]

Downstream issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286368