ci/mac: add test runner for oldest macOS target

only meant for testing the oldest macOS target we support, currently
10.15, to catch possible usages of features that are not supported and
not properly guarded.

since dependencies are not build for that taget it will lead to a
partially broken build.

Author: Akemi

.github/workflows/build.yml

@@ -227,10 +227,6 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os:
-          - "macos-13"
-          - "macos-14"
-          - "macos-15"
         include:
           - os: "macos-13"
             arch: "intel"
@@ -241,6 +237,10 @@ jobs:
             xcode: "Xcode_15.2"
           - os: "macos-15"
             arch: "arm"
+          - os: "macos-15"
+            arch: "test"
+            swift: "-target arm64-apple-macosx10.15"
+            target: "10.15"
     steps:
       - uses: actions/checkout@v4
 
@@ -276,8 +276,11 @@ jobs:
           ./ci/build-macos.sh
         env:
           TRAVIS_OS_NAME: "${{ matrix.os }}"
+          SWIFT_FLAGS: "${{ matrix.swift }}"
+          MACOSX_DEPLOYMENT_TARGET: "${{ matrix.target }}"
 
       - name: Create App Bundle
+        if: ${{ matrix.arch != 'test' }}
         run: |
           meson compile -C build macos-bundle
           tar -czvf mpv.tar.gz -C build mpv.app
@@ -298,6 +301,7 @@ jobs:
           cat ./build/meson-logs/testlog.txt
 
       - uses: actions/upload-artifact@v4
+        if: ${{ matrix.arch != 'test' }}
         with:
           name: mpv-${{ matrix.os }}-${{ matrix.arch }}
           path: mpv.tar.gz

ci/build-macos.sh

@@ -18,7 +18,8 @@ meson setup build $common_args \
   -Dobjc_args="-Wno-error=deprecated -Wno-error=deprecated-declarations" \
   -D{gl,iconv,lcms2,lua,jpeg,plain-gl,zlib}=enabled \
   -D{cocoa,coreaudio,gl-cocoa,videotoolbox-gl,videotoolbox-pl}=enabled \
-  -D{swift-build,macos-cocoa-cb,macos-media-player,macos-touchbar,vulkan}=enabled
+  -D{swift-build,macos-cocoa-cb,macos-media-player,macos-touchbar,vulkan}=enabled \
+  -Dswift-flags="${SWIFT_FLAGS}"
 
 meson compile -C build -j4
 meson install -C build