LLVM installation from binary package fails in GitHub Actions because cellar could not be found

[ixfd64]

Output of brew config

HOMEBREW_VERSION: 4.6.6
ORIGIN: https://github.com/Homebrew/brew
HEAD: 7878c73b8562eb369f9da66d4c55b89ff6397182
Last commit: 9 days ago
Branch: stable
Core tap HEAD: 91eba34564c80613fde3cb572036ead90141854b
Core tap last commit: 7 days ago
Core tap JSON: 25 Aug 03:02 UTC
Core cask tap HEAD: f7a3affb60cc8ac37444849c9860f4a8031c7cf8
Core cask tap last commit: 7 days ago
Core cask tap JSON: 25 Aug 03:02 UTC
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: ["--no-quarantine"]
HOMEBREW_COLOR: set
HOMEBREW_DEVELOPER: set
HOMEBREW_MAKE_JOBS: 3
HOMEBREW_NO_AUTO_UPDATE: set
HOMEBREW_NO_INSTALL_CLEANUP: set
HOMEBREW_SORBET_RUNTIME: set
Homebrew Ruby: 3.4.5 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/3.4.5/bin/ruby
CPU: 3-core 64-bit dunno
Clang: 15.0.0 build 1500
Git: 2.51.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 14.7.6-arm64
CLT: 16.2.0.0.1.1733547573
Xcode: 15.4 => /Applications/Xcode_15.4.app/Contents/Developer
Rosetta 2: false

Output of brew doctor

Please note that these warnings are just used to help the Homebrew maintainers
with debugging if you file an issue. If everything you use Homebrew for is
working fine: please don't worry or file an issue; just ignore this. Thanks!

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  openssl@1.1


Warning: You have uncommitted modifications to Homebrew/homebrew-core.
If this is a surprise to you, then you should stash these modifications.
Stashing returns Homebrew to a pristine state but can be undone
should you later need to do so for some reason.
  git -C "/opt/homebrew/Library/Taps/homebrew/homebrew-core" stash -u && git -C "${path}" clean -d -f

Uncommitted files:
   M Formula/o/openssl@1.1.rb

Error: Process completed with exit code 1.

Description of issue

I had to roll back PoCL to version 6.0.1 in a project I'm working on because 7.0.1 causes macOS builds to not work correctly due to linker errors. Here's the original issue: actions/runner-images#12775

I used HOMEBREW_DEVELOPER=1 so that Homebrew 4.6.4 and above will continue to work in GitHub Actions. It successfully downloads the PoCL 6.0.1 formula but fails to install LLVM:

==> Installing dependencies for pocl: llvm@18, hwloc and opencl-icd-loader
==> Installing pocl dependency: llvm@18
==> Downloading https://ghcr.io/v2/homebrew/core/llvm/18/manifests/18.1.8
Already downloaded: /Users/runner/Library/Caches/Homebrew/downloads/453029f9b69aee9d1ef51458e6e1f8a79e8590ed167dca11d7c6888fc36c5766--llvm@18-18.1.8.bottle_manifest.json
==> Pouring llvm@18--18.1.8.ventura.bottle.tar.gz
Error: No such file or directory @ rb_file_s_lstat - /usr/local/Cellar/llvm/18.1.8
Error: Process completed with exit code 1.

Here are the commands I used in the workflow file:

- name: Install PoCL 6.0.1
      run: |
        echo "Installing PoCL 6.0.1..."
        pocl_commit="165dae39781a8150f265d2fae6ea036964dbaad8"
        pocl_rb_link="https://raw.githubusercontent.com/Homebrew/homebrew-core/$pocl_commit/Formula/p/pocl.rb"
        mkdir -p /tmp/pocl
        curl -fsSL "$pocl_rb_link" -o /tmp/pocl/pocl.rb
        brew install --formula /tmp/pocl/pocl.rb

How can I resolve this?

Update: I added a --debug switch and got additional details:

==> Changing dylib ID of /opt/homebrew/Cellar/llvm@18/18.1.8/lib/libmlir_runner_utils.dylib
  from @@HOMEBREW_PREFIX@@/opt/llvm@18/lib/libmlir_runner_utils.dylib
    to /opt/homebrew/opt/llvm@18/lib/libmlir_runner_utils.dylib
==> Codesigning /opt/homebrew/Cellar/llvm@18/18.1.8/lib/libmlir_runner_utils.dylib
==> Changing dylib ID of /opt/homebrew/Cellar/llvm@18/18.1.8/lib/libunwind.1.0.dylib
  from @@HOMEBREW_PREFIX@@/opt/llvm@18/lib/libunwind.1.dylib
    to /opt/homebrew/opt/llvm@18/lib/libunwind.1.dylib
==> Codesigning /opt/homebrew/Cellar/llvm@18/18.1.8/lib/libunwind.1.0.dylib
Error: No such file or directory @ rb_file_s_lstat - /opt/homebrew/Cellar/llvm/18.1.8
/opt/homebrew/Library/Homebrew/extend/pathname/disk_usage_extension.rb:73:in 'File.lstat'
Rerun with `--verbose` to see the original backtrace
/opt/homebrew/Library/Homebrew/extend/pathname/disk_usage_extension.rb:73:in 'Pathname#lstat'
/opt/homebrew/Library/Homebrew/extend/pathname/disk_usage_extension.rb:73:in 'DiskUsageExtension#compute_disk_usage'
/opt/homebrew/Library/Homebrew/extend/pathname/disk_usage_extension.rb:30:in 'DiskUsageExtension#abv'
/opt/homebrew/Library/Homebrew/formula_installer.rb:1054:in 'FormulaInstaller#summary'
/opt/homebrew/Library/Homebrew/formula_installer.rb:1043:in 'FormulaInstaller#finish'
/opt/homebrew/Library/Homebrew/formula_installer.rb:926:in 'FormulaInstaller#install_dependency'
/opt/homebrew/Library/Homebrew/formula_installer.rb:836:in 'block in FormulaInstaller#install_dependencies'
/opt/homebrew/Library/Homebrew/formula_installer.rb:836:in 'Array#each'
/opt/homebrew/Library/Homebrew/formula_installer.rb:836:in 'FormulaInstaller#install_dependencies'
/opt/homebrew/Library/Homebrew/formula_installer.rb:559:in 'FormulaInstaller#install'
/opt/homebrew/Library/Homebrew/install.rb:490:in 'Homebrew::Install.install_formula'
/opt/homebrew/Library/Homebrew/install.rb:423:in 'block in Homebrew::Install.install_formulae'
/opt/homebrew/Library/Homebrew/install.rb:420:in 'Array#each'
/opt/homebrew/Library/Homebrew/install.rb:420:in 'Homebrew::Install.install_formulae'
/opt/homebrew/Library/Homebrew/cmd/install.rb:383:in 'Homebrew::Cmd::InstallCmd#run'
/opt/homebrew/Library/Homebrew/brew.rb:101:in '<main>'
Error: Process completed with exit code 1.

Homebrew first processes libunwind.1.dylib but tries to validate the signature of libunwind.1.0.dylib instead. Could that be related to the issue?

[cho-m]

The install error is likely fixed by:

• formula_cellar_checks: avoid changing name brew#20571

but not in a tagged release yet. Probably only impacts brew 4.6.5 - 4.6.7 so could try either main branch or 4.6.4.

---

PoCL 7 error seems to be another Clang config lookup problem. Root cause may be same as:

• LLVM / Clang system config file setting breaks with -no-canonical-prefixes homebrew-core#220757

Would need a fix in upstream LLVM around https://github.com/llvm/llvm-project/blob/main/clang/lib/Driver/Driver.cpp#L219-L238

Some possible workarounds:

• forcing realpath, e.g. export POCL_PATH_CLANG=$(realpath $(brew --prefix llvm@20)/bin/clang)
• using a user config file in ~/.config/clang/ that imitates corresponding one in $(brew --prefix)/etc/clang
• or perhaps just manually setting SDKROOT