llvmPackages.libllvm: disable getMacOSHostVersion on LLVM < 21

[emilazy]

Currently untested. See commit messages.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[emilazy]

I guess this can go to staging for unstable, as the packages were already built prior to the builder OS upgrade.

[emilazy]

Diff of llvm_18 on aarch64-darwin:

- /nix/store/3dq3yd8nwdki4afhrpayhh9rknpfd4j1-llvm-18.1.8.drv:{out}
+ /nix/store/n83i0zsdh343xbf1954ndzcn8c9chf6y-llvm-18.1.8.drv:{out}
• The environments do not match:
    postPatch=''
      substituteInPlace cmake/modules/AddLLVM.cmake \
        --replace-fail 'set(_install_name_dir INSTALL_NAME_DIR "@rpath")' "set(_install_name_dir)"
      rm test/MC/ELF/cfi-version.ll
    
      substituteInPlace unittests/TargetParser/Host.cpp \
        --replace-fail '/usr/bin/sw_vers' "/nix/store/9h1l6sxvvcrbdh44lgfg48dn52lp2vv4-DarwinTools-1/bin/sw_vers"
      substituteInPlace test/ExecutionEngine/Interpreter/intrinsics.ll \
        --replace-fail "%roundeven32 = call float @llvm.roundeven.f32(float 0.000000e+00)" "" \
        --replace-fail "%roundeven64 = call double @llvm.roundeven.f64(double 0.000000e+00)" ""
      substituteInPlace unittests/Support/VirtualFileSystemTest.cpp \
        --replace-fail "PhysicalFileSystemWorkingDirFailure" "DISABLED_PhysicalFileSystemWorkingDirFailure"
    + substituteInPlace unittests/TargetParser/Host.cpp \
    +   --replace-fail "getMacOSHostVersion" "DISABLED_getMacOSHostVersion"
      substituteInPlace unittests/Support/CMakeLists.txt \
        --replace-fail "Path.cpp" ""
      rm unittests/Support/Path.cpp
      substituteInPlace unittests/IR/CMakeLists.txt \
        --replace-fail "PassBuilderCallbacksTest.cpp" ""
      rm unittests/IR/PassBuilderCallbacksTest.cpp
      rm test/tools/llvm-objcopy/ELF/mirror-permissions-unix.test
      rm test/tools/llvm-objcopy/ELF/strip-preserve-atime.test
      patchShebangs test/BugPoint/compile-custom.ll.py
''

I don’t really feel like running an entire LLVM build to validate; it’s the same method we’re already using to disable the test on x86_64-darwin. This should be good to go.

[rrbutani]

(@emilazy thanks for updating the comments, I'd missed that x86_64 darwin uses CoreFoundation from the system now)

[alyssais]

But this is staging!

[vcunat]

Maybe that's for easier auto-backport label?

[emilazy]

I will clean up on staging and backport to staging-25.11. This is getting backported to a release branch.

[vcunat]

Let's get Hydra start working (on this on 25.11).

[nixpkgs-ci]

Successfully created backport PR for release-25.11:

• [Backport release-25.11] llvmPackages.libllvm: disable getMacOSHostVersion on LLVM < 21 #479103