Linking error with Xcode 15 invalid r_symbolnum

[ehuss]

Trying to run the cranelift testsuite on an x86_64 macOS system with Xcode 15 results in an error that looks roughly like this:

  = note: ld: warning: search path '/Users/eric/Proj/rust/rustc_codegen_cranelift/./build/rtstartup/lib/rustlib/x86_64-apple-darwin/lib' not found
          ld: warning: search path '/Users/eric/Proj/rust/rustc_codegen_cranelift/./build/rtstartup/lib/rustlib/x86_64-apple-darwin/lib' not found
          ld: multiple errors: invalid r_symbolnum=16 in '/Users/eric/Proj/rust/rustc_codegen_cranelift/build/stdlib_target/x86_64-apple-darwin/release/deps/std-6043c0e15839b1b8.37dz0diu3mok62ud.rcgu.o'; invalid r_symbolnum=20 in '/Users/eric/Proj/rust/rustc_codegen_cranelift/build/stdlib_target/x86_64-apple-darwin/release/deps/std-6043c0e15839b1b8.3cpybd90f24iafu4.rcgu.o'; invalid r_symbolnum=11 in '/Users/eric/Proj/rust/rustc_codegen_cranelift/build/stdlib_target/x86_64-apple-darwin/release/deps/std-6043c0e15839b1b8.5dobmwxxuzv3ys1m.rcgu.o'
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

This is fairly easily reproducible, though it doesn't seem to happen 100% of the time. This is a blocker for rust-lang/rust updating the Xcode version.

Currently tested Xcode 15.0 and 15.2. A significant thing to note is that Xcode 15 introduced ld-prime, their new linker. One thing to consider while investigating is to try setting the linker flag -ld_classic to narrow down if the new linker is a factor (sorry, I'm not familiar with cranelift's setup to help more).

Tested at commit cdae185e3022b6e7c6c7fe363353fe1176a06604.