MAINT: Drop support for Intel Macs

.github/workflows/build_wheels.yml

@@ -17,10 +17,6 @@ jobs:
         - os: ubuntu-latest
           platform_id: manylinux_x86_64
 
-        # MacOS x86_64
-        - os: macos-15-intel
-          platform_id: macosx_x86_64
-
         # MacOS arm64
         - os: macos-15
           platform_id: macosx_arm64
@@ -44,11 +40,7 @@ jobs:
       - name: Set macOS Deployment Target
         if: runner.os == 'macOS'
         run: |
-          if [[ "${{ matrix.os }}" == "macos-15-intel" ]]; then
-            echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
-          elif [[ "${{ matrix.os }}" == "macos-15" ]]; then
-            echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
-          fi
+          echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
 
       - name: Install Boost
         if: runner.os == 'Windows'

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-15-intel, macos-15, windows-latest] # Intel linux, Intel Mac, ARM Mac, Windows
+        os: [ubuntu-latest, macos-15, windows-latest] # Intel linux, ARM Mac, Windows
 
     steps:
       - uses: actions/checkout@v6
@@ -43,7 +43,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-15-intel, macos-15, windows-latest] # Intel linux, Intel Mac, ARM Mac, Windows
+        os: [ubuntu-latest, macos-15, windows-latest] # Intel linux, ARM Mac, Windows
         python-version: ["3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@v6
@@ -59,23 +59,7 @@ jobs:
       - name: Install llvm (macOS)
         if: runner.os == 'macOS'
         run: |
-          if [[ "$(uname -m)" == "arm64" ]]; then
-            brew install llvm
-          else
-            brew install llvm
-
-            brew install llvm@20
-
-            LLVM20_PREFIX="$(brew --prefix llvm@20)"
-
-            echo "PATH=$LLVM20_PREFIX/bin:$PATH" >> $GITHUB_ENV
-            echo "LLVM_CONFIG=$LLVM20_PREFIX/bin/llvm-config" >> $GITHUB_ENV
-            echo "LLVM_DIR=$LLVM20_PREFIX/lib/cmake/llvm" >> $GITHUB_ENV
-            echo "CMAKE_PREFIX_PATH=$LLVM20_PREFIX/lib/cmake:$CMAKE_PREFIX_PATH" >> $GITHUB_ENV
-            echo "LDFLAGS=-L$LLVM20_PREFIX/lib $LDFLAGS" >> $GITHUB_ENV
-            echo "CPPFLAGS=-I$LLVM20_PREFIX/include $CPPFLAGS" >> $GITHUB_ENV
-          fi
-
+          brew install llvm
 
       - name: Install llvm (Windows)
         if: runner.os == 'Windows'
@@ -88,7 +72,6 @@ jobs:
           nox -s test-${{ matrix.python-version }} -- --cov --cov-report=lcov:${{matrix.os}}-${{matrix.python-version}}.lcov --cov-report=term --cov-append --durations=20
 
       - name: Coveralls Parallel
-        if: matrix.os != 'macos-15-intel'
         uses: coverallsapp/github-action@v2
         with:
           parallel: true

.github/workflows/release.yml

@@ -16,10 +16,6 @@ jobs:
         # manylinux x86_64
         - os: ubuntu-latest
           platform_id: manylinux_x86_64
-
-        # MacOS x86_64
-        - os: macos-15-intel
-          platform_id: macosx_x86_64
 
         # MacOS arm64
         - os: macos-15
@@ -44,11 +40,7 @@ jobs:
       - name: Set macOS Deployment Target
         if: runner.os == 'macOS'
         run: |
-          if [[ "${{ matrix.os }}" == "macos-15-intel" ]]; then
-            echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
-          elif [[ "${{ matrix.os }}" == "macos-15" ]]; then
-            echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
-          fi
+          echo "MACOSX_DEPLOYMENT_TARGET=15.0" >> $GITHUB_ENV
 
       - name: Install Boost
         if: runner.os == 'Windows'

docs/developers/troubleshooting.md

@@ -9,7 +9,7 @@ There could be several reasons `piqtree` doesn't install correctly.
 
 ### Check your operating system is supported
 
-At this stage, we currently only support x86-64 linux, and x86-64 and ARM macOS.
+At this stage, we currently only support x86-64 linux, x86-64 Windows, and ARM macOS.
 
 ### Check the IQ-TREE library is up-to-date
 
@@ -28,9 +28,10 @@ There could be several reasons `piqtree` doesn't build.
 
 ### Check your operating system is supported
 
-At this stage, we currently only support x86-64 linux, and x86-64 and ARM macOS.
+At this stage, we currently only support x86-64 linux, x86-64 Windows, and ARM macOS.
 
 ### Check dependencies have been installed
 
+- If on Windows, try running `./before_all_windows.sh` which will also install dependencies.
 - If on macOS, try running `./before_all_mac.sh` which will also install dependencies.
 - If on linux, try installing the dependencies listed at the top of `.devcontainer/DockerFile`