Cross compile Cuberite for Raspberry Pi

Seadragon91 · (This post was last modified: 09-25-2019, 02:32 AM by Seadragon91.)

Hello!

Compiling cuberite on a raspberry pi can take a long time. For this problem I looked for a way to cross compile a raspberry pi version. This tutorial should work on debian and on ubuntu based systems.

You will need a linux system for the compiling process, a raspberry pi image and other things too. If you open the terminal then the location should be by default your home location.
We need to do 3 steps. Let's start.

Install Requirements

Packages that are required. Run this command with sudo or as root:

apt-get install cmake lua5.1 gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf

Required for:

gcc-arm-linux-gnueabihf - Contains arm-linux-gnueabihf-gcc. the C Cross Compiler
g++-arm-linux-gnueabihf - Contains arm-linux-gnueabihf-cpp, the C++ Cross Compiler
cmake - Building cuberite
lua5.1 - In a build step, generates the c++ bindings for lua

Setting up the gcc cross compiler

Open a terminal, create the directory raspberrypi and cd into it
Inside of the directory raspberrypi, create a directory named rootfs. Now the raspberry pi image is required.
For mounting the image the offset of the second partition is required. Run this with sudo or as root:
```
fdisk -l <path to raspberry image>
```

Example of the output:

Disk 2019-07-10-raspbian-buster-lite.img: 2 GiB, 2197815296 bytes, 4292608 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x17869b7d

Device                              Boot  Start    End Sectors  Size Id Type
2019-07-10-raspbian-buster-lite.img1        8192  532480  524289  256M  c W95 FAT32 (LBA)
2019-07-10-raspbian-buster-lite.img2      540672 4292607 3751936  1.8G 83 Linux

Multiply the second number under start by 512
```
540672 * 512 = 276824064
```
This command has to be run with sudo or as a root user.
```
mount -o offset=276824064 <path to img file> /mnt
```
Run this commands with sudo or as root, to copy the lib and usr (can take a while is over 1,5 GiB big) directory into the raspberrypi/rootfs directory:
```
cp -r /mnt/lib $HOME/raspberrypi/rootfs
cp -r /mnt/usr $HOME/raspberrypi/rootfs
```
Run this with sudo or as root, to unmount the raspberry pi image:
```
umount /mnt
```

Create a file named pi.cmake in directory raspberrypi and add this content:

SET(CMAKE_SYSTEM_NAME Linux)
SET(CMAKE_SYSTEM_VERSION 1)
SET(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
SET(CMAKE_CXX_COMPILER arm-linux-gnueabihf-cpp)
SET(CMAKE_FIND_ROOT_PATH $ENV{HOME}/raspberrypi/rootfs)
SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

The compiling environment has been setup. Now cd into the cuberite source or clone it if you haven't it

Inside of raspberrypi create the directory Release and cd into it:

cmake -D CMAKE_TOOLCHAIN_FILE=$HOME/raspberrypi/pi.cmake -DCMAKE_BUILD_TYPE=RELEASE ..

For compiling you can add the number of cores / processors it should use. Run nproc to see how many threads are possible, e.g. 4
```
make -j<number of cores to use>
make - Only uses one thread
"make -j4" - Uses up to 4 cores / processors, if available
```
If it was successful the executable is inside the directory <path to cuberite>/Server

Everything completed. Copy the the directory Server to the raspberry pi and test if it's running.

If you have any questions, problems ask.

Good luck,
Seadragon91

Sources used:
http://stackoverflow.com/questions/19162...s-compiler
http://somewideopenspace.wordpress.com/2...pi-wheezy/
http://www.raspberrypi.org/downloads/