Add aarch64 as a cross-compilation target (#194)

contrib/Dockerfile

@@ -15,22 +15,25 @@
 
 FROM debian:stretch
 
+RUN dpkg --add-architecture arm64
 RUN dpkg --add-architecture armhf
 RUN dpkg --add-architecture armel
 RUN dpkg --add-architecture mipsel
 RUN apt-get update
 
-RUN apt-get install -y curl git build-essential crossbuild-essential-armhf crossbuild-essential-armel crossbuild-essential-mipsel
-RUN apt-get install -y libasound2-dev libasound2-dev:armhf libasound2-dev:armel libasound2-dev:mipsel
+RUN apt-get install -y curl git build-essential crossbuild-essential-arm64 crossbuild-essential-armel crossbuild-essential-armhf crossbuild-essential-mipsel
+RUN apt-get install -y libasound2-dev libasound2-dev:arm64 libasound2-dev:armel libasound2-dev:armhf libasound2-dev:mipsel
 
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
 ENV PATH="/root/.cargo/bin/:${PATH}"
+RUN rustup target add aarch64-unknown-linux-gnu
 RUN rustup target add arm-unknown-linux-gnueabi
 RUN rustup target add arm-unknown-linux-gnueabihf
 RUN rustup target add mipsel-unknown-linux-gnu
 
 RUN mkdir /.cargo && \
-    echo '[target.arm-unknown-linux-gnueabihf]\nlinker = "arm-linux-gnueabihf-gcc"' > /.cargo/config && \
+    echo '[target.aarch64-unknown-linux-gnu]\nlinker = "aarch64-linux-gnu-gcc"' > /.cargo/config && \
+    echo '[target.arm-unknown-linux-gnueabihf]\nlinker = "arm-linux-gnueabihf-gcc"' >> /.cargo/config && \
     echo '[target.arm-unknown-linux-gnueabi]\nlinker = "arm-linux-gnueabi-gcc"' >> /.cargo/config && \
     echo '[target.mipsel-unknown-linux-gnu]\nlinker = "mipsel-linux-gnu-gcc"' >> /.cargo/config
 

contrib/docker-build.sh

@@ -2,6 +2,7 @@
 set -eux
 
 cargo build --release --no-default-features --features alsa-backend
+cargo build --release --target aarch64-unknown-linux-gnu --no-default-features --features alsa-backend
 cargo build --release --target arm-unknown-linux-gnueabihf --no-default-features --features alsa-backend
 cargo build --release --target arm-unknown-linux-gnueabi --no-default-features --features alsa-backend
 cargo build --release --target mipsel-unknown-linux-gnu --no-default-features --features alsa-backend