build: replace xgo with NDK for Android builds

.github/workflows/build.yml

@@ -213,50 +213,89 @@ jobs:
         # Deploy binaries if enabled in config && not a PR && not a fork
         if: matrix.deploy && github.head_ref == '' && github.repository == 'rclone/rclone'
 
-  xgo:
-    timeout-minutes: 60
-    name: "xgo cross compile"
-    runs-on: ubuntu-latest
+  android:
+     timeout-minutes: 30
+     name: "android-all"
+     runs-on: ubuntu-latest
+     
+     steps:
+       - name: Checkout
+         uses: actions/checkout@v2
 
-    steps:
+       # Upgrade together with NDK version
+       - name: Set up Go 1.14
+         uses: actions/setup-go@v1
+         with:
+           go-version: 1.14
 
-      - name: Checkout
-        uses: actions/checkout@v1
-        with:
-          # Checkout into a fixed path to avoid import path problems on go < 1.11
-          path: ./src/github.com/rclone/rclone
+       # Upgrade together with Go version. Using a GitHub-provided version saves around 2 minutes.
+       - name: Force NDK version
+         run: echo "y" | sudo ${ANDROID_HOME}/tools/bin/sdkmanager --install "ndk;21.4.7075529" | grep -v = || true
 
-      - name: Set environment variables
-        shell: bash
-        run: |
-          echo 'GOPATH=${{ runner.workspace }}' >> $GITHUB_ENV
-          echo '${{ runner.workspace }}/bin' >> $GITHUB_PATH
+       - name: Go module cache
+         uses: actions/cache@v2
+         with:
+           path: ~/go/pkg/mod
+           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+           restore-keys: |
+             ${{ runner.os }}-go-
 
-      - name: Cross-compile rclone
-        run: |
-          docker pull billziss/xgo-cgofuse
-          GO111MODULE=off go get -v github.com/karalabe/xgo # don't add to go.mod
-          # xgo \
-          #     -image=billziss/xgo-cgofuse \
-          #     -targets=darwin/amd64,linux/386,linux/amd64,windows/386,windows/amd64 \
-          #     -tags cmount \
-          #     -dest build \
-          #     .
-          xgo \
-              -image=billziss/xgo-cgofuse \
-              -targets=android/* \
-              -dest build \
-              .
+       - name: arm-v7a Set environment variables
+         shell: bash
+         run: |
+           echo "CC=$(echo $ANDROID_HOME/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi16-clang)" >> $GITHUB_ENV
+           echo "CC_FOR_TARGET=$CC" >> $GITHUB_ENV
+           echo 'GOOS=android' >> $GITHUB_ENV
+           echo 'GOARCH=arm' >> $GITHUB_ENV
+           echo 'GOARM=7' >> $GITHUB_ENV
+           echo 'CGO_ENABLED=1' >> $GITHUB_ENV
+           echo 'CGO_LDFLAGS=-fuse-ld=lld -s -w' >> $GITHUB_ENV
+       - name: arm-v7a build
+         run: go build -v -tags android -trimpath -o build/rclone-android-16-armv7a .
 
-      - name: Build rclone
-        shell: bash
-        run: |
-          make
+       - name: arm64-v8a Set environment variables
+         shell: bash
+         run: |
+           echo "CC=$(echo $ANDROID_HOME/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android21-clang)" >> $GITHUB_ENV
+           echo "CC_FOR_TARGET=$CC" >> $GITHUB_ENV
+           echo 'GOOS=android' >> $GITHUB_ENV
+           echo 'GOARCH=arm64' >> $GITHUB_ENV
+           echo 'CGO_ENABLED=1' >> $GITHUB_ENV
+           echo 'CGO_LDFLAGS=-fuse-ld=lld -s -w' >> $GITHUB_ENV
 
-      - name: Upload artifacts
-        run: |
-          make ci_upload
-        env:
-          RCLONE_CONFIG_PASS: ${{ secrets.RCLONE_CONFIG_PASS }}
-        # Upload artifacts if not a PR && not a fork
-        if: github.head_ref == '' && github.repository == 'rclone/rclone'
+       - name: arm64-v8a build
+         run: go build -v -tags android -trimpath -o build/rclone-android-21-armv8a .
+
+       - name: x86 Set environment variables
+         shell: bash
+         run: |
+           echo "CC=$(echo $ANDROID_HOME/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/i686-linux-android16-clang)" >> $GITHUB_ENV
+           echo "CC_FOR_TARGET=$CC" >> $GITHUB_ENV
+           echo 'GOOS=android' >> $GITHUB_ENV
+           echo 'GOARCH=386' >> $GITHUB_ENV
+           echo 'CGO_ENABLED=1' >> $GITHUB_ENV
+           echo 'CGO_LDFLAGS=-fuse-ld=lld -s -w' >> $GITHUB_ENV
+
+       - name: x86 build
+         run: go build -v -tags android -trimpath -o build/rclone-android-16-x86 .
+
+       - name: x64 Set environment variables
+         shell: bash
+         run: |
+           echo "CC=$(echo $ANDROID_HOME/ndk/21.4.7075529/toolchains/llvm/prebuilt/linux-x86_64/bin/x86_64-linux-android21-clang)" >> $GITHUB_ENV
+           echo "CC_FOR_TARGET=$CC" >> $GITHUB_ENV
+           echo 'GOOS=android' >> $GITHUB_ENV
+           echo 'GOARCH=amd64' >> $GITHUB_ENV
+           echo 'CGO_ENABLED=1' >> $GITHUB_ENV
+           echo 'CGO_LDFLAGS=-fuse-ld=lld -s -w' >> $GITHUB_ENV
+
+       - name: x64 build
+         run: go build -v -tags android -trimpath -o build/rclone-android-21-x64 .
+
+       - name: Upload artifacts
+         run: |
+           make ci_upload
+         env:
+           RCLONE_CONFIG_PASS: ${{ secrets.RCLONE_CONFIG_PASS }}
+         # Upload artifacts if not a PR && not a fork
+         if: github.head_ref == '' && github.repository == 'rclone/rclone'