Add x86_64-unknown-linux-musl target (#46)

.cargo/config.toml

@@ -1,3 +1,13 @@
+[target.x86_64-unknown-linux-musl]
+  rustflags = [
+    "-C", "target-feature=+crt-static",
+    "-C", "link-arg=-s",
+    "-C", "link-arg=-lc",
+    "-C", "link-arg=-lgcc",
+    "-L", "native=/usr/local/x86_64-linux-musl-target/lib",
+    "-l", "static=stdc++",
+  ]
+
 [target.aarch64-unknown-linux-musl]
   rustflags = [
     "-C", "target-feature=+crt-static",

Cross.toml

@@ -1,3 +1,6 @@
+[target.x86_64-unknown-linux-musl]
+dockerfile="cross/Dockerfile.x86_64-unknown-linux-musl"
+
 [target.aarch64-unknown-linux-musl]
 dockerfile="cross/Dockerfile.aarch64-unknown-linux-musl"
 

Makefile

@@ -1,12 +1,17 @@
 .PHONY: dist
 
 # Compile the binaries for all targets.
-build: build-aarch64-unknown-linux-musl \
+build: \
+	build-x86_64-unknown-linux-musl \
+	build-aarch64-unknown-linux-musl \
 	build-armv5te-unknown-linux-musleabi \
 	build-armv7-unknown-linux-musleabihf \
 	build-mips-unknown-linux-musl \
 	build-mipsel-unknown-linux-musl
 
+build-x86_64-unknown-linux-musl:
+	cross build --target x86_64-unknown-linux-musl --release
+
 build-aarch64-unknown-linux-musl:
 	cross build --target aarch64-unknown-linux-musl --release
 
@@ -23,12 +28,16 @@ build-mipsel-unknown-linux-musl:
 	cross build --target mipsel-unknown-linux-musl --release --no-default-features --features semtech_udp
 
 # Build distributable binaries for all targets.
-dist: dist-aarch64-unknown-linux-musl \
+dist: \
+	dist-x86_64-unknown-linux-musl \
+	dist-aarch64-unknown-linux-musl \
 	dist-armv5te-unknown-linux-musleabi \
 	dist-armv7-unknown-linux-musleabihf \
 	dist-mips-unknown-linux-musl \
 	dist-mipsel-unknown-linux-musl
 
+dist-x86_64-unknown-linux-musl: build-x86_64-unknown-linux-musl package-x86_64-unknown-linux-musl
+
 dist-aarch64-unknown-linux-musl: build-aarch64-unknown-linux-musl package-aarch64-unknown-linux-musl
 
 dist-armv5te-unknown-linux-musleabi: build-armv5te-unknown-linux-musleabi package-armv5te-unknown-linux-musleabi
@@ -40,6 +49,17 @@ dist-mips-unknown-linux-musl: build-mips-unknown-linux-musl package-mips-unknown
 dist-mipsel-unknown-linux-musl: build-mipsel-unknown-linux-musl package-mipsel-unknown-linux-musl
 
 # Package the compiled binaries
+package-x86_64-unknown-linux-musl:
+	$(eval PKG_VERSION := $(shell cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version'))
+	mkdir -p dist
+
+	# .tar.gz
+	tar -czvf dist/chirpstack-mqtt-forwarder_$(PKG_VERSION)_amd64.tar.gz -C target/x86_64-unknown-linux-musl/release chirpstack-mqtt-forwarder
+
+	# .deb
+	cargo deb --target x86_64-unknown-linux-musl --no-build --no-strip
+	cp target/x86_64-unknown-linux-musl/debian/*.deb ./dist
+
 package-aarch64-unknown-linux-musl:
 	$(eval PKG_VERSION := $(shell cargo metadata --no-deps --format-version 1 | jq -r '.packages[0].version'))
 	mkdir -p dist

cross/Dockerfile.x86_64-unknown-linux-musl

@@ -0,0 +1,28 @@
+FROM ghcr.io/cross-rs/x86_64-unknown-linux-musl:latest
+
+ENV OPENSSL_VERSION=3.1.2
+ENV OPENSSL_TARGET=linux-x86_64
+ENV MUSL_PREFIX=x86_64-linux-musl
+
+RUN apt-get update && \
+    apt-get --assume-yes install \
+    protobuf-compiler \
+    libprotobuf-dev \
+    libssl-dev
+
+RUN echo "Building OpenSSL" && \
+    cd /tmp && \
+    curl -fLO "https://www.openssl.org/source/openssl-$OPENSSL_VERSION.tar.gz" && \
+    tar xvzf "openssl-$OPENSSL_VERSION.tar.gz" && cd "openssl-$OPENSSL_VERSION" && \
+    env CC=$MUSL_PREFIX-gcc ./Configure no-shared no-zlib -fPIC --prefix=/usr/local/$MUSL_PREFIX-target -DOPENSSL_NO_SECURE_MEMORY $OPENSSL_TARGET && \
+    env C_INCLUDE_PATH=/usr/local/$MUSL_PREFIX/include/ make depend && \
+    env C_INCLUDE_PATH=/usr/local/$MUSL_PREFIX/include/ make && \
+    make install_sw && \
+    rm -r /tmp/*
+
+RUN echo "Copy libstdc++" && \
+    mkdir -p /usr/local/$MUSL_PREFIX-target/lib && \
+    cp /usr/local/$MUSL_PREFIX/lib/libstdc++* /usr/local/$MUSL_PREFIX-target/lib
+
+ENV PKG_CONFIG_PATH=/usr/local/$MUSL_PREFIX-target/lib/pkgconfig
+ENV OPENSSL_DIR=/usr/local/$MUSL_PREFIX-target