Add iOS build to CI

Fix iOS build as well as minor Android cleanup since the
problems for both platforms are so similar

.github/workflows/continuous_integration.yml

@@ -174,6 +174,30 @@ jobs:
       - name: Test (standalone)
         run: bash -c 'cd ./Test && ./runtests'
 
+  iOS:
+    runs-on: macos-13
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: lukka/get-cmake@8be6cca406b575906541e8e3b885d46f416bba39 # v3.27.7
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@6d1841ec156c39a52b1b23a810da917ab98da1f4 # v1.2.10
+        with:
+          key: IOS
+      - run: ./update_glslang_sources.py
+      # NOTE: The MacOS SDK ships universal binaries. CI should reflect this.
+      - name: Configure Universal Binary for iOS
+        run: |
+          cmake -S . -B build \
+          -D CMAKE_BUILD_TYPE=Debug \
+          -D CMAKE_SYSTEM_NAME=iOS \
+          "-D CMAKE_OSX_ARCHITECTURES=arm64;x86_64" \
+          -G Ninja
+        env:
+          CMAKE_C_COMPILER_LAUNCHER: ccache
+          CMAKE_CXX_COMPILER_LAUNCHER: ccache
+      - run: cmake --build build
+      - run: cmake --install build --prefix /tmp
+
   android:
     runs-on: ubuntu-22.04
     strategy:
@@ -183,29 +207,24 @@ jobs:
         LEGACY: [ON, OFF]
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4.7.1
-        with:
-          python-version: '3.7'
       - uses: lukka/get-cmake@8be6cca406b575906541e8e3b885d46f416bba39 # v3.27.7
       - name: Setup ccache
         uses: hendrikmuhs/ccache-action@6d1841ec156c39a52b1b23a810da917ab98da1f4 # v1.2.10
         with:
           key: android-${{ matrix.LEGACY }}
-      - name: Update Glslang Sources
+      - run: ./update_glslang_sources.py
-        run: ./update_glslang_sources.py
+      - name: Configure for Android
-      - name: Configure
         run: |
           cmake -S . -B build/ --toolchain $ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake \
           -D CMAKE_BUILD_TYPE=Release \
           -D ANDROID_ABI=armeabi-v7a \
           -D ANDROID_USE_LEGACY_TOOLCHAIN_FILE=${{ matrix.LEGACY }} \
-          -D BUILD_TESTING=OFF
+          -G Ninja
         env:
-          CMAKE_GENERATOR: Ninja
           CMAKE_C_COMPILER_LAUNCHER: ccache
           CMAKE_CXX_COMPILER_LAUNCHER: ccache
-      - name: Build
+      - run: cmake --build build/
-        run: cmake --build build/
+      - run: cmake --install build/ --prefix /tmp
 
   emscripten:
     runs-on: ubuntu-22.04

CMakeLists.txt

@@ -59,7 +59,24 @@ if ("${CMAKE_BUILD_TYPE}" STREQUAL "")
     set(CMAKE_BUILD_TYPE "Debug")
 endif()
 
+# Currently iOS and Android are very similar.
+# They both have their own packaging (APP/APK).
+# Which makes regular executables/testing problematic.
+#
+# Currently the only deliverables for these platforms are
+# libraries (either STATIC or SHARED).
+#
+# Furthermore testing is equally problematic.
+if (IOS OR ANDROID)
+    set(ENABLE_GLSLANG_BINARIES OFF)
+    set(SPIRV_SKIP_EXECUTABLES ON)
+
+    set(ENABLE_CTEST OFF)
+    set(BUILD_TESTING OFF)
+endif()
+
 option(SKIP_GLSLANG_INSTALL "Skip installation")
+
 if(NOT ${SKIP_GLSLANG_INSTALL})
   set(ENABLE_GLSLANG_INSTALL ON)
 endif()