glued_cross_compiler [Fish Otter Project Documentation]

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====== Cross-compiling for the Raspberry Pi ======
Compiling DUNE directly on the Raspberry Pi is possible, but soon becomes tedious, as it takes a while. Luckily there is an alternative, cross-compiling. The Raspberry Pi has an available toolchain at [[https://github.com/raspberrypi/tools|GitHub]], but it uses a too old version of the gcc compiler, and therefore it will not compile DUNE. The solution to this, is to use the cross-compiler environment that is made for LSTS Glued.

===== Setting up Glued cross-compiler for DUNE =====
  * Install required packages

  sudo apt-get install docker.io

  * Clone Glued from github

  git clone https://github.com/LSTS/glued.git

  * Run docker shell for the build system

  cd glued/docker && sudo make && sudo make shell

  * Create build configuration for mariner-01

   ./mkconfig.bash mariner-01

  * Compile system image for mariner-01

  ./mksystem.bash lctr-rpi/mariner-01.bash

  * Create cross-compilation toolchain

  ./pktoolchain.bash lctr-rpi/mariner-01.bash

  * Leave docker enviroment

  exit
===== Cross compiling with the Glued toolchain =====
  * Make directory for pibuild

  mkdir dunebuildrpi && cd dunebuildrpi

  * Create makefiles with cmake, replace ''%%[wherisit]%%'' with path to the glued folder just created and ''%%[dune_source]%%'' with dune folder

  cmake -DCROSS=[wherisit]/glued/lctr-rpi/toolchain/bin/armv7-lsts-linux-gnueabihf-gcc [dune_source]

  * Compile with make, add the -j4 for using more threads, add package to make a tar.gz2 archive that can easily be transferred to the Raspberry Pi

  make -j4