Cross-compile to armhf

.github/workflows/build.yml

@@ -12,12 +12,19 @@ jobs:
         arch:
           - x86_64
           - i686
+          - armhf
     env:
       ARCH: ${{ matrix.arch }}
     steps:
       - uses: actions/checkout@v1
       - name: Install dependencies
-        run: sudo apt-get install nasm gcc-multilib
+        run: sudo apt-get install nasm
+      - name: Install i686 cross-compile dependencies
+        run: sudo apt-get install gcc-multilib
+        if: matrix.arch == 'i686'
+      - name: Install armhf cross-compile dependencies
+        run: sudo apt-get install gcc-multilib-arm-linux-gnueabihf
+        if: matrix.arch == 'armhf'
       - name: Build
         run: |
           mkdir artifacts
@@ -92,6 +99,10 @@ jobs:
         with:
           name: ffmpeg-linux-i686
           path: artifacts/
+      - uses: actions/download-artifact@v1
+        with:
+          name: ffmpeg-linux-armhf
+          path: artifacts/
       - uses: actions/download-artifact@v1
         with:
           name: ffmpeg-windows-x86_64

build-linux.sh

@@ -20,7 +20,29 @@ case $ARCH in
 i686)
     FFMPEG_CONFIGURE_FLAGS+=(--cc="gcc -m32")
     ;;
-x86_64|armhf)
+armhf*)
+    FFMPEG_CONFIGURE_FLAGS+=(
+        --enable-cross-compile
+        --cross-prefix=arm-linux-gnueabihf-
+        --target-os=linux
+        --arch=arm
+    )
+    case $ARCH in
+    armhf-rpi2)
+        FFMPEG_CONFIGURE_FLAGS+=(
+            --cpu=cortex-a7
+            --extra-cflags='-fPIC -mcpu=cortex-a7 -mfloat-abi=hard -mfpu=neon-vfpv4 -mvectorize-with-neon-quad'
+        )
+        ;;
+    armhf-rpi3)
+        FFMPEG_CONFIGURE_FLAGS+=(
+            --cpu=cortex-a53
+            --extra-cflags='-fPIC -mcpu=cortex-a53 -mfloat-abi=hard -mfpu=neon-fp-armv8 -mvectorize-with-neon-quad'
+        )
+        ;;
+    esac
+    ;;
+x86_64)
     ;;
 *)
     echo "Unknown architecture"