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How to compile the player for Raspberry Pi from linux

The mqtt library is heavily-templated, and takes a lot of memory to compile (>1G) which does not work on RPI. To compile the player for RPI, use cross compiltion from linux machine with enough memory:

install

install cross compiler package for armhf (beaglebone / raspberry-pi 32 bit)

sudo apt install crossbuild-essential-armhf

install sshfs so we can mount the pi's filesystem to the PC

sudo apt install sshfs

mount rpi fs to linux

SSHFS here will mount the raspberry pi (its root - /) to the local filesystem

activate the mount

sudo sshfs ${RPI_USERNAME}@${RPI_IP}:/ $MOUNT_POINT example: sudo sshfs pi@10.0.0.200:/ /mnt/rpi

if for some reason there's an issue with the mount - do: ls -l /mnt if you see a lot of '?????????' on /mnt/rpi then run: fusermount -u /mnt/rpi and run the sshfs command again.

compile the player on linux with RPI mount

  1. clone the repository to a directory on RPI file system (using the mount, or directly).
  2. then cd to the project directory on the mount fs, for example: cd /mnt/rpi/home/pi/dev/wavplayeralsa
  3. create the cmake build directory: mkdir build && cd build
  4. run camke with relevant toolchain camke file: cmake -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_FILE .. where $TOOLCHAIN_FILE should point to the toolchain-armv7l.cmake file from cross-compile directory in the project repo. note that this file assumes rpi mounting point is at /mnt/rpi.
  5. make -j2 the generated project.
  6. the executable is now in the build directory on the rpi