Cross-compile rsync in static mode

cross-static-rsync.sh

# get rsync
❯ git clone [email protected]:WayneD/rsync.git
❯ git checkout v3.2.3  # recent tag

# get musl cross toolchain from https://musl.cc/
❯ wget https://musl.cc/arm-linux-musleabihf-cross.tgz
❯ tar zxvf arm-linux-musleabihf-cross.tgz

# now add the toolchain to path and configure + make
❯ export PATH=$PATH:$PWD/arm-linux-musleabihf-cross/bin
❯ export CC=arm-linux-musleabihf-gcc
❯ ./configure CFLAGS='-static' --host=arm-linux-musleabihf \
  --disable-simd \
  --disable-openssl \
  --disable-xxhash \
  --disable-zstd \
  --disable-lz4 \
  --disable-asm
  
❯ make -j $(getconf _NPROCESSORS_CONF)

# install qemu to test
❯ sudo apt install qemu-user-static
❯ ./rsync --help