Merge #94: cmake, ci: Add macOS cross compile jobs

c9ea5b8 fixup! ci: Test CMake edge cases (Hennadii Stepanov)

Pull request description:

ACKs for top commit:
  pablomartin4btc:
    reACK c9ea5b8

Tree-SHA512: 0419c316ba011bd3f334f1f3c68a6fb38d92a405a53914b9b2476cbd2c7684e6d7be28196e9c9f87158de8cb5e32e5ded9a9829ebe7d319a9d186fc3f61868c4

.github/workflows/cmake.yml

@@ -289,6 +289,14 @@ jobs:
             exe_extension: '.exe'
             # Avoid "No space left on device" error.
             skip_install: 'true'
+          - name: 'macOS x86_64'
+            triplet: 'x86_64-apple-darwin'
+            macos_sdk: 'Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers'
+            configure_options: '-DWERROR=ON'
+          - name: 'macOS arm64'
+            triplet: 'arm64-apple-darwin'
+            macos_sdk: 'Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers'
+            configure_options: '-DWERROR=ON'
 
     steps:
       - name: Checkout
@@ -315,10 +323,22 @@ jobs:
           echo ${{ matrix.host.depends_options }} > depends/depends_options
 
       - name: Depends fingerprint (4)
+        if: ${{ matrix.host.triplet == 'x86_64-apple-darwin' || matrix.host.triplet == 'arm64-apple-darwin' }}
+        run: |
+          echo ${{ matrix.host.macos_sdk }} > depends/macos_sdk
+
+      - name: Depends fingerprint (5)
         id: depends_fingerprint
         run: |
           echo "hash=${{ hashFiles('depends/**') }}" >> "$GITHUB_OUTPUT"
 
+      - name: Download macOS SDK
+        if: ${{ matrix.host.triplet == 'x86_64-apple-darwin' || matrix.host.triplet == 'arm64-apple-darwin' }}
+        run: |
+          wget --no-verbose https://bitcoincore.org/depends-sources/sdks/${{ matrix.host.macos_sdk }}.tar.gz
+          mkdir depends/SDKs
+          tar -xf ${{ matrix.host.macos_sdk }}.tar.gz --directory depends/SDKs
+
       - name: Depends cache
         id: depends_cache
         uses: actions/cache@v4