infra: add android CI build test with necessary cross build config.

.github/workflows/build_android.yml

@@ -0,0 +1,70 @@
+name: Android
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  build_x86_64:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: nttld/setup-ndk@v1.3.1
+      id: setup-ndk
+      with:
+        submodules: true
+        ndk-version: r21e
+        local-cache: true
+
+    - name: Install Packages
+      run: |
+        sudo apt-get update
+        sudo pip3 install meson ninja
+
+    - name: Build
+      env:
+        NDK: ${{ steps.setup-ndk.outputs.ndk-path }}
+        API: 21
+      run: |
+        sed -e "s|NDK|$NDK|g" -e "s|API|$API|g" ./cross/android_x86_64.txt > /tmp/android_cross.txt
+        meson setup build -Dlog=true -Dloaders="all" -Dsavers="all" -Dbindings="capi" --cross-file /tmp/android_cross.txt
+        sudo ninja -C build install
+
+    - uses: actions/upload-artifact@v3
+      with:
+        name: result
+        path: build/src/libthorvg*
+
+  build_aarch64:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: nttld/setup-ndk@v1.3.1
+      id: setup-ndk
+      with:
+        submodules: true
+        ndk-version: r21e
+        local-cache: true
+
+    - name: Install Packages
+      run: |
+        sudo apt-get update
+        sudo pip3 install meson ninja
+
+    - name: Build
+      env:
+        NDK: ${{ steps.setup-ndk.outputs.ndk-path }}
+        API: 21
+      run: |
+        sed -e "s|NDK|$NDK|g" -e "s|API|$API|g" ./cross/android_aarch64.txt > /tmp/android_cross.txt
+        meson setup build -Dlog=true -Dloaders="all" -Dsavers="all" -Dbindings="capi" --cross-file /tmp/android_cross.txt
+        sudo ninja -C build install
+
+    - uses: actions/upload-artifact@v3
+      with:
+        name: result
+        path: build/src/libthorvg*

.github/workflows/build_ios.yml

@@ -33,7 +33,7 @@ jobs:
         name: result
         path: build/src/libthorvg*
 
-  build_armv64:
+  build_aarch64:
     runs-on: macos-latest
     steps:
     - uses: actions/checkout@v3

cross/android_aarch64.txt

@@ -0,0 +1,16 @@
+[binaries]
+cpp     = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-androidAPI-clang++'
+ar      = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ar'
+as      = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-as'
+ranlib  = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ranlib'
+ld      = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-ld'
+strip   = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android-strip'
+
+[properties]
+sys_root = 'NDK/sysroot'
+
+[host_machine]
+system = 'android'
+cpu_family = 'arm'
+cpu = 'aarch64'
+endian = 'little'

cross/android_x86_64.txt

@@ -0,0 +1,16 @@
+[binaries]
+cpp     = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-androidAPI-clang++'
+ar      = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android-ar'
+as      = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android-as'
+ranlib  = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android-ranlib'
+ld      = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android-ld'
+strip   = 'NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android-strip'
+
+[properties]
+sys_root = 'NDK/sysroot'
+
+[host_machine]
+system = 'android'
+cpu_family = 'x86_64'
+cpu = 'x86_64'
+endian = 'little'

src/meson.build

@@ -42,7 +42,7 @@ subdir('loaders')
 subdir('savers')
 
 thorvg_lib_dep = [common_dep, utils_dep, loader_dep, saver_dep]
-if host_machine.system() != 'windows'
+if host_machine.system() != 'windows' and host_machine.system() != 'android'
     thread_dep = meson.get_compiler('cpp').find_library('pthread')
     thorvg_lib_dep += [thread_dep]
 endif