[macOS] `__ulock_wait2` usage build error on macOS 10.15 (and probably older)

[cho-m]

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

• Operating System & Odin Version: macOS 10.15, Odin dev-2022-05, Homebrew (https://github.com/Homebrew/homebrew-core/pull/97679)
• Please paste odin report output: N/A

Expected Behavior

Successfully build on macOS 10.15 or document supported macOS versions.

Current Behavior

In Homebrew (https://github.com/Homebrew/homebrew-core/pull/97679), we see that build fails on macOS 10.15 at run_demo due to __ulock_wait2 usage. https://github.com/odin-lang/Odin/blob/df233aee942bd85a5162a36a82bf33fe74d2f2ad/core/sync/futex_darwin.odin#L33

Didn't find much info online, but it sounds like __ulock_wait2 might be only available on macOS 11+ based on zig's usage https://github.com/ziglang/zig/blob/master/lib/std/Thread/Futex.zig#L166-L174

Failure Information (for bugs)

Steps to Reproduce

Please provide detailed steps for reproducing the issue.

1. On macOS 10.15, run make release or ./build_odin.sh release.

Failure Logs

  + clang src/main.cpp src/libtommath.cpp -Wno-switch -Wno-macro-redefined -Wno-unused-value -std=c++14 '-DGIT_SHA="df233aee"' '-DODIN_VERSION_RAW="dev-2022-05"' -I/usr/local/Cellar/llvm/13.0.1_1/include -std=c++14 -stdlib=libc++ -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -L/usr/local/Cellar/llvm/13.0.1_1/lib -Wl,-search_paths_first -Wl,-headerpad_max_install_names -O3 -pthread -lm -lstdc++ -liconv -ldl -lLLVM-C -o odin
  + set +x
  Undefined symbols for architecture x86_64:
    "___ulock_wait2", referenced from:
        _sync._futex_wait_with_timeout-3463 in demo.o
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  make: *** [release] Error 1

[sumofat]

Also both my mac's both catalina

[clankill3r]

I have almost the same,

_sync._futex_wait_with_timeout-3858 in demo.o

or

_sync._futex_wait_with_timeout-2886 in demo.o

depending on if I use make release or ./build_odin.sh.

I really hope I can use odin some day :)

[clankill3r]

Ok, I did some digging, I posted it here, it should fix it for you.

https://github.com/odin-lang/Odin/issues/1959

[cho-m]

Closing as fixed by #2015