Switch hexagon targets to rust-lld

compiler/rustc_target/src/spec/targets/hexagon_unknown_linux_musl.rs

@@ -8,6 +8,7 @@ pub(crate) fn target() -> Target {
     base.features = "-small-data,+hvx-length128b".into();
 
     base.has_rpath = true;
+    base.linker = Some("rust-lld".into());
     base.linker_flavor = LinkerFlavor::Unix(Cc::Yes);
 
     base.c_enum_min_bits = Some(8);

compiler/rustc_target/src/spec/targets/hexagon_unknown_none_elf.rs

@@ -27,6 +27,7 @@ pub(crate) fn target() -> Target {
             max_atomic_width: Some(32),
             emit_debug_gdb_scripts: false,
             c_enum_min_bits: Some(8),
+            linker: Some("rust-lld".into()),
             ..Default::default()
         },
     }

src/doc/rustc/src/platform-support/hexagon-unknown-linux-musl.md

@@ -39,6 +39,12 @@ dynamically linked executables.
 # /opt/clang+llvm-18.1.0-cross-hexagon-unknown-linux-musl/x86_64-linux-gnu/bin/qemu-hexagon -L /opt/clang+llvm-18.1.0-cross-hexagon-unknown-linux-musl/x86_64-linux-gnu/target/hexagon-unknown-linux-musl/usr/ ./hello
 ```
 
+## Linking
+
+This target selects `rust-lld` by default.  Another option to use is
+[eld](https://github.com/qualcomm/eld), which is also provided with
+the opensource hexagon toolchain and the Hexagon SDK.
+
 ## Building the target
 Because it is Tier 3, rust does not yet ship pre-compiled artifacts for this
 target.

src/doc/rustc/src/platform-support/hexagon-unknown-none-elf.md

@@ -25,6 +25,13 @@ Functions marked `extern "C"` use the [Hexagon architecture calling convention](
 
 This target generates PIC ELF binaries.
 
+## Linking
+
+This target selects `rust-lld` by default.  Another option to use is
+[eld](https://github.com/qualcomm/eld), which is also provided with
+[the opensource hexagon toolchain](https://github.com/quic/toolchain_for_hexagon)
+and the Hexagon SDK.
+
 ## Building the target
 
 You can build Rust with support for the target by adding it to the `target`