add GitHubActions to build for android

Signed-off-by: leleliu008 <leleliu008@gmail.com>

.github/workflows/android.yml

@@ -0,0 +1,115 @@
+name: cross compile with android-ndk
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  cross-compile-for-android:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04, macos-10.15, macos-11]
+        target-abi: [armeabi-v7a, arm64-v8a, x86, x86_64]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - run:  brew install tree file
+
+      - run:  tree --version
+      - run:  file --version
+      - run:  make --version
+
+      - run:  echo "ANDROID_NDK_HOME=${ANDROID_NDK_LATEST_HOME}" >> "$GITHUB_ENV"
+
+      - run:  |
+          env | sed -n '/^ANDROID_/p'
+
+      - run:  cat "$ANDROID_NDK_HOME/source.properties"
+
+      - name: install runtime dependencies
+        run:  |
+          for item in tbb-2021.5.0-bin xxhash-0.8.1-bin openssl-1.1.1g-bin
+          do
+            curl -LO https://github.com/leleliu008/test/releases/download/20220103-1623/${item}.tar.xz
+            tar vxf ${item}.tar.xz
+            printf '%s\n' "$item" >> runtime-dependencies
+          done
+
+      - name: build for ${{ matrix.target-abi }}
+        run: |
+          COLOR_GREEN='\033[0;32m'        # Green
+          COLOR_PURPLE='\033[0;35m'       # Purple
+          COLOR_OFF='\033[0m'             # Reset
+
+          run() {
+            printf '%b\n' "$COLOR_PURPLE==>$COLOR_OFF $COLOR_GREEN$*$COLOR_OFF"
+            eval "$*"
+          }
+
+          BUILD_MACHINE_OS_TYPE=$(uname | tr A-Z a-z)
+          BUILD_MACHINE_OS_ARCH=$(uname -m)
+
+          ANDROID_NDK_BASE=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/$BUILD_MACHINE_OS_TYPE-$BUILD_MACHINE_OS_ARCH
+          ANDROID_NDK_BIND=$ANDROID_NDK_BASE/bin
+          SYSROOT=$ANDROID_NDK_BASE/sysroot
+
+          export PATH="$ANDROID_NDK_BIND:$PATH"
+
+          export CPPFLAGS="--sysroot $SYSROOT"
+          export CXXFLAGS="--sysroot $SYSROOT"
+          export   CFLAGS="--sysroot $SYSROOT"
+          export  LDFLAGS="--sysroot $SYSROOT"
+
+          for item in $(cat runtime-dependencies)
+          do
+            export CPPFLAGS="$CPPFLAGS -I$PWD/${item}/${{ matrix.target-abi }}/include"
+            export  LDFLAGS="$LDFLAGS  -L$PWD/${item}/${{ matrix.target-abi }}/lib"
+          done
+
+          case ${{ matrix.target-abi }} in
+            armeabi-v7a) export CC=armv7a-linux-androideabi21-clang ;;
+            arm64-v8a)   export CC=aarch64-linux-android21-clang    ;;
+            x86)         export CC=i686-linux-android21-clang       ;;
+            x86_64)      export CC=x86_64-linux-android21-clang     ;;
+          esac
+
+          export CXX=${CC}++
+          export AR=llvm-ar
+          export STRIP=llvm-strip
+
+          printf '%b\n' "$COLOR_PURPLE==>$COLOR_OFF ${COLOR_GREEN}show PATH$COLOR_OFF"
+          printf '%s\n' "$PATH" | tr ':' '\n'
+          printf '%s\n'
+
+          # avoid link against librt
+          printf 'INPUT(-lc)\n' > librt.a
+          export LDFLAGS="$LDFLAGS -L$PWD"
+
+          run make clean
+          run make install PREFIX=$PWD/install.d OS=Linux LTO=1 SYSTEM_TBB=1 SYSTEM_XXHASH=1
+
+      - run:  tree install.d
+
+      - run:  |
+          file install.d/lib/mold/mold-wrapper.so
+          case ${{ matrix.target-abi }} in
+            armeabi-v7a) file install.d/lib/mold/mold-wrapper.so | grep 'ELF 32-bit LSB shared object, ARM, EABI5'   ;;
+            arm64-v8a)   file install.d/lib/mold/mold-wrapper.so | grep 'ELF 64-bit LSB shared object, ARM aarch64,' ;;
+            x86)         file install.d/lib/mold/mold-wrapper.so | grep 'ELF 32-bit LSB shared object, Intel 80386,' ;;
+            x86_64)      file install.d/lib/mold/mold-wrapper.so | grep 'ELF 64-bit LSB shared object, x86-64,'      ;;
+          esac
+
+      - run:  |
+          file install.d/bin/mold
+          case ${{ matrix.target-abi }} in
+            armeabi-v7a) file install.d/bin/mold | grep 'ELF 32-bit LSB pie executable, ARM, EABI5'   ;;
+            arm64-v8a)   file install.d/bin/mold | grep 'ELF 64-bit LSB pie executable, ARM aarch64,' ;;
+            x86)         file install.d/bin/mold | grep 'ELF 32-bit LSB pie executable, Intel 80386,' ;;
+            x86_64)      file install.d/bin/mold | grep 'ELF 64-bit LSB pie executable, x86-64,'      ;;
+          esac