CrossArm

Just another crosscompiling tool for arm/aarch64 GNU/Linux.

The aim of this project was to make crosscompiling as simple as possible.

The docker image is using Ubuntu 20.04.

Toolchains

• Arm 10.3 (2021.07)
• Aarch64 10.3 (2021.07)

Installing

You can easily install CrossArm using the build script

You must run the install script as root

./install.sh (Default architecture is arm)

For list of arguments use the help argument

./install.sh -h

The script builds a docker ubuntu image with the selected architecture toolchain.

Script for running the crosscompiling environment is installed in /usr/bin.
The name of the script is crossarm-{architecture} eg. crossarm-arm, crossarm-aarch64.

Uninstall

To uninstall use ./install.sh -u. (Keeps the chroot directory /opt/crossarm-{architecture})
For complete uninstall use ./install.sh -u -p

Usage

To open current directory in the crosscompile environment just run the crossarm-{architecture} script.
If you want to open a different directory in the environment run crossarm-{architecture} /path/to/dir.

The whole toolchain /toolchain is added in the PATH variable for more convenient usage.

To not lose the installed libraries, a folder /cross-chroot has been added, the folder is shared with the host in /opt/crossarm-{architecture}.
Therefore whenever you want to install a library and preserve it, use prefix /cross-chroot.

Examples

I will be using aarch64 for these examples.

Building simple C/C++ program

File main.c

#include <stdio.h>

int main() {
    printf("Hello arm\n");
    return 0;
}

Enter the environent crossarm-aarch64
Now you can build it using aarch64-none-linux-gnu-gcc main.c -o main
And viola

❯ file main
main: ELF 64-bit LSB executable, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0, with debug_info, not stripped

Building using CMake

For CMake nothing much changes. You just need to add the toolchain into your CMakeFile which is located in /opt/toolchain.cmake

set(CMAKE_TOOLCHAIN_FILE /opt/toolchain.cmake)

TODO

• Run the commands using oneliner without entering the docker