Merge pull request #656 from halprin/macos-rosetta

Compile macOS Intel Version on Apple Silicon

.github/workflows/build.yml

@@ -24,12 +24,12 @@ jobs:
             cc: cl
             cxx: cl
             name: Windows-x64
-          - runner: macos-13 # Should be Intel
+          - runner: macos-14  # Apple Silicon, but we cross-compile
             preset: mac
             cc: cc
             cxx: c++
             name: macOS-Intel
-          - runner: macos-14 # This is supposed to be M1
+          - runner: macos-14  # Apple Silicon
             preset: mac
             cc: cc
             cxx: c++
@@ -60,11 +60,21 @@ jobs:
         with:
           submodules: recursive
 
+      - name: Install macOS Rosetta 2
+        if: ${{ matrix.os.name == 'macOS-Intel' }}
+        run: /usr/sbin/softwareupdate --install-rosetta --agree-to-license
+
+      - name: Install Intel version of Brew
+        if: ${{ matrix.os.name == 'macOS-Intel' }}
+        shell: arch -x86_64 /bin/bash -e {0}
+        run: |
+          /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+          eval "$(/usr/local/bin/brew shellenv)"  # makes the Intel version of Brew and its installs are enshrined as the default 
+          echo "PATH=$PATH" >> $GITHUB_ENV  # modify $PATH so the above step persists into the future steps
+
       - name: Install macOS dependencies
         if: ${{ matrix.os.preset == 'mac' }}
-        run: |
-          # Install packages from Homebrew
-          brew bundle install
+        run: brew bundle install
 
       - name: Install Linux dependencies
         if: ${{ matrix.os.runner == 'ubuntu-latest' }}