crosstool-arm-osx

Raspberry Pi Cross Compiler Script for OSX - Updated for crosstools-ng.1.23.0

Status: The cross-compiler, zImage, modules and dtbs now compile. Installing Raspbian Stretch works Installing compiled latest Raspbian cross compiled kernel works The kernel booted for the first time. Yeah!! Will start from scratch to reproduce success Wahoo, kernel boots again from previously downloaded sources

Note: The default is now crosstool-ng latest that will be downloaded automatially from GitHub because I believe there is a problems with the 1.23.0 tarball

build.sh Installs a gcc cross compiler for compiling code for raspberry pi on OSX. This script is based on several scripts and forum posts I've found around the web, the most significant being:

About the build.sh Script
How the build.sh Script Works
Features
Installation and Execution
Smoke Test
Inspiration and special thanks
Refrence Materials
License

About the build Script

The script downloads, compiles and installs all necessary software. The only prerequisite I know of is to have the latest version of XCode and have the command line tools installed. It works for me without modification on OSX 10.13.3 with XCode 9.2

*** The purpose is to eventually have a full script that builds on OSX and will compile the latest Linux with RT patches and with LinuxCnC.

How the build Script Works

The script starts by creating a sparse HFSX (case sensitive) filesystem on which to perform the build. The default volume name is CrossToolNG, but can be changed as an option to build.sh. The filesystem image created is a file that lives in the same directory as the build.sh script.

The build.sh script will then install some HomeBrew packages on the sparse volume. I currently use MacPorts. At some time during my attempts to setup this cross compiler it interfered with the install, and as such HomeBrew is placed on the same sparse image as the compiler. In this fashion, all tools are kept together in a completely controlled environment.

The script then downlaods and installs crosstool-ng. It helps to be a little familiar with the tool. See http://crosstool-ng.org/

Once crosstool-ng is installed, it is configured with the arm-unknown-linux-gnueabi.config file by copying that file to the approproite location and alter it for $Volume. The script then automatically fires up the crosstool config menu (menuconfig) so you can make changes. The menuconfig program is basically a front end for the config file. You can either make changes or just exit. You can also just edit the config file before running the script and remove call to:

   PATH=/Volumes/${Volume}/brew/bin:$PATH
  /Volumes/$({OLUME}/crosstool-ng-src/ct-ng menuconfig

Once that is all done, we run the build. If all goes well, you will then have a toolchain for comiling arm code on osx. The default install is in /Volumes/CrossToolNG/install/arm-unknown-linux-gnueabi

Features

The script can be restarted at any time and it will continue where it left off

Installation and Execution

To use: open and read the build.sh script to suite your needs. Then run the script from within the folder it is contained. It will need to access the arm-unknown-linux-gnueabi.config file.

 bash build.sh

At any time, you can re-run the script and it will try to continue where you left off, or you can run: bash build.sh realClean to start over. For further options try:

bash build.sh -h

License

See LICENSE

Smoke Test

As a smoke test a simple HelloWorld program can be run using build.sh -t

The test is something like:

cat <<EOF > HelloWorld.cpp
#include <iostream>
using namespace std;

int main ()
{
  cout << "Hello World!";
  return 0;
}
EOF

PATH=/Volumes/${Volume}/install/arm-unknown-linux-gnueabi/bin:$PATH arm-linux-gnueabihf-g++ HelloWorld.cpp -o HelloWorld

Go forth and compile.

Inspiration and special thanks

Based on:

[crosstool-arm-osx]https://github.com/asymptotik/crosstool-arm-osx<

So much was changed and the previous version was from 5 years ago, that it deserved its own repository. I do thank Rick Boykin very much though. It was a great place to start.

Reference Materials

[crosstool-arm-osx]http://github.com/asymptotik/crosstool-arm-osx
[osx-crosstool-ng-cmd]http://okertanov.github.com/2012/12/24/osx-crosstool-ng
[MacOS-X]http://crosstool-ng.org/hg/crosstool-ng/file/715b711da3ab/docs/MacOS-X.txt
[Toolchain_installation_on_OS_X]http://gnuarmeclipse.livius.net/wiki/Toolchain_installation_on_OS_Xt
[RPI_Kernel_compilation]http://elinux.org/RPi_Kernel_Compilationt

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