rustc-1.88.0 does not build using external LLVM due to missing rust-lld

When building using an external LLVM, the build fails due to a missing rust-lld even when lld is present in path.

Summary

Here is the end of the build log:

Dist rust-docs-1.88.0-x86_64-apple-darwin
	finished in 27.638 seconds
Installing stage2 docs (x86_64-apple-darwin)
install: creating uninstall script at /tmp/dst.rustc/usr/local/lib/rustlib/uninstall.sh
install: installing component 'rust-docs'

    rust docs installed.

Dist rust-std-1.88.0-x86_64-apple-darwin
	finished in 0.442 seconds
Installing stage2 std (x86_64-apple-darwin)
install: creating uninstall script at /tmp/dst.rustc/usr/local/lib/rustlib/uninstall.sh
install: installing component 'rust-std-x86_64-apple-darwin'

    rust std installed.


thread 'main' panicked at src/bootstrap/src/lib.rs:1779:24:
src.symlink_metadata() failed with No such file or directory (os error 2) ("src = /tera/tera/debo/Projects/rustc/rustc-1.88.0-src/build/x86_64-apple-darwin/stage2/lib/rustlib/x86_64-apple-darwin/bin/rust-lld")
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Panic was initiated from src/bootstrap/src/lib.rs:1779:24
Build completed unsuccessfully in 0:26:40

Command used

DESTDIR=/tmp/dst.rustc x.py install

Note the error from bootstrap in the log:

Warning: LLD is enabled when using external llvm-config. LLD will not be built and copied to the sysroot.

Expected behaviour

I expected it to build.

Actual behaviour

Failed to build. See above log snippet. Entire log is attached.

rustc-1.88-log.txt

Bootstrap configuration (bootstrap.toml)

I am using a system LLVM llvm-20.1.7:

llvm-config = "/usr/local/bin/llvm-config"

Operating system

macOS 10.12.6

HEAD

6b00bc3880198600130e1cf62b8f8a93494488cc

Start at src/bootstrap/src/lib.rs:1779 and reproduce with the shown bootstrap.toml, external llvm-config, and DESTDIR=/tmp/dst.rustc x.py install command. Read the warning about LLD not being built or copied to the sysroot and trace the rust-lld handling; done means the build and installation complete when lld is available in PATH.