Should I expect Rust 1.28 & 1.30 to support building on MacOS 12?

1

Recently, GitHub Actions began transitioning macos-latest to macos-12. I have a project where I am building on minimum Rust versions 1.28 and 1.30 that began to show build errors on macos-12:

   Compiling libc v0.2.99
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-m64" "-L" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "/Users/runner/work/min-sized-rust/min-sized-rust/no_std/target/release/build/libc-c975b02cf3f7d8ed/build_script_build-c975b02cf3f7d8ed.build_script_build.32wt36t2-cgu.0.rcgu.o" "-o" "/Users/runner/work/min-sized-rust/min-sized-rust/no_std/target/release/build/libc-c975b02cf3f7d8ed/build_script_build-c975b02cf3f7d8ed" "/Users/runner/work/min-sized-rust/min-sized-rust/no_std/target/release/build/libc-c975b02cf3f7d8ed/build_script_build-c975b02cf3f7d8ed.2emquonry7w2cho0.rcgu.o" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/Users/runner/work/min-sized-rust/min-sized-rust/no_std/target/release/deps" "-L" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libstd-29ce6fda87a76ebc.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libpanic_unwind-398b73b2e53c1ff1.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc_jemalloc-b44ec4903d844bed.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libunwind-5386821277fae731.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc_system-498e6384f8c92f09.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liblibc-4d611a500e28f0e5.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc-71e3722defae21cf.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcore-48cbf085067c437e.rlib" "/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcompiler_builtins-27ec7eb585f2725d.rlib" "-lSystem" "-lresolv" "-lpthread" "-lc" "-lm"
  = note: ld: in /Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libpanic_unwind-398b73b2e53c1ff1.rlib(rust.metadata.bin), archive member 'rust.metadata.bin' with length 24076 is not mach-o or llvm bitcode file '/Users/runner/.rustup/toolchains/1.30.0-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libpanic_unwind-398b73b2e53c1ff1.rlib'
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

Since MacOS 12 is relatively new, should this compile error simply be considered unsupported on those older stable Rust compiler versions?

2

You will need to use Rust 1.54 or newer. The older versions produced a slightly invalid format that newer versions of xcode are more restrictive on.

A workaround is to use an older xcode. I haven't tested, but I believe macos-12 uses xcode 14.0.1, and macos-11 uses xcode 13.2.1. The GitHub macos images come with several versions of xcode, and you can choose which one to use with xcode-select --switch. I would try that if you want a workaround. The list of available versions is at runner-images/macos-12-Readme.md at main · actions/runner-images · GitHub

3 Likes
3

Note that Xcode 12 is not supported on macOS 12. And for the future, Xcode 13 is not supported on macOS 13.

macOS targeting is a forced upgrade treadmill. It's just inherent to how Apple runs the ecosystem.

4

Thanks for the details @ehuss!

Given that I also have issues with older Cargo included in 1.28 not accepting the new lockfile format, I'll probably simply drop the CI builds for 1.28-1.30 as they are becoming harder and harder to maintain.

5

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