CI: add diagnostic step to debug pkg-config resolution

Author: vkuttyp

.github/workflows/swift.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
     name: Build & Test
-    runs-on: macos-14        # Apple Silicon runner, Xcode 15+
+    runs-on: macos-14
 
     steps:
       - name: Checkout
@@ -21,24 +21,31 @@ jobs:
       - name: Install FreeTDS
         run: brew install freetds
 
-      - name: Set Homebrew environment
-        # On macos-14 (Apple Silicon), Homebrew installs to /opt/homebrew.
-        # PKG_CONFIG_PATH must be set so SPM's systemLibrary target can run
-        # `pkg-config freetds` and find the FreeTDS .pc file.
-        # GITHUB_ENV persists these variables for all subsequent steps.
+      - name: Diagnose environment
         run: |
-          echo "PKG_CONFIG_PATH=/opt/homebrew/lib/pkgconfig" >> $GITHUB_ENV
-          echo "PATH=/opt/homebrew/bin:$PATH" >> $GITHUB_ENV
+          echo "=== which pkg-config ==="
+          which pkg-config || echo "NOT FOUND"
+          echo "=== pkg-config freetds ==="
+          pkg-config --cflags --libs freetds || echo "pkg-config freetds FAILED"
+          echo "=== PKG_CONFIG_PATH ==="
+          echo "${PKG_CONFIG_PATH:-empty}"
+          echo "=== .pc files ==="
+          find /opt/homebrew /usr/local -name "freetds.pc" 2>/dev/null || echo "no .pc file found"
+          echo "=== brew --prefix freetds ==="
+          brew --prefix freetds
+          echo "=== ls pkgconfig dirs ==="
+          ls /opt/homebrew/lib/pkgconfig/ 2>/dev/null | grep -i free || echo "none"
+          ls /usr/local/lib/pkgconfig/ 2>/dev/null | grep -i free || echo "none"
 
       - name: Build
         run: swift build -v
+        env:
+          PKG_CONFIG_PATH: /opt/homebrew/lib/pkgconfig:/usr/local/lib/pkgconfig
 
       - name: Test
         run: swift test -v
         env:
-          # Integration tests are skipped automatically when these are not set.
-          # To run them, add HOST / USERNAME / PASSWORD / DATABASE as
-          # GitHub Actions secrets (Settings → Secrets → Actions).
+          PKG_CONFIG_PATH: /opt/homebrew/lib/pkgconfig:/usr/local/lib/pkgconfig
           HOST:     ${{ secrets.DB_HOST }}
           USERNAME: ${{ secrets.DB_USERNAME }}
           PASSWORD: ${{ secrets.DB_PASSWORD }}