WIP: Try LLVM 19 on macOS

Author: joshtriplett

.github/workflows/ci.yml

@@ -91,13 +91,13 @@ jobs:
           # prepare environment for the following steps
           source $HOME/.cargo/env
           # print some useful info to help troubleshoot
-          brew info llvm@17
+          brew info llvm@19
           which python3
           /usr/bin/env python3 -c "import sys; print(sys.path)"
 
       - name: cargo build --release
         run: |
-          export LLVM_CONFIG_PATH=$(brew --prefix llvm@17)/bin/llvm-config
+          export LLVM_CONFIG_PATH=$(brew --prefix llvm@19)/bin/llvm-config
           export RUSTFLAGS="-D warnings"
           export RUSTDOCFLAGS="-D warnings"
           # Don't build with `--all-features` (see analogous step for Linux).

scripts/provision_mac.sh

@@ -17,10 +17,8 @@ done
 SCRIPT_DIR="$(dirname "$0")"
 export HOMEBREW_NO_AUTO_UPDATE=1
 
-# NOTE: Pin LLVM to a known good version since new releases
-# tend not to be backwards compatible
 # `bash` needed b/c macOS ships with bash 3, which doesn't support arrays properly
-brew install -q python cmake ninja gpg llvm@17 bash
+brew install -q python cmake ninja gpg llvm@19 bash
 
 # Python 3 packages
 python3 -m pip install --break-system-packages --user --upgrade pip