This is the documentation for the latest (main) development branch of Zephyr. If you are looking for the documentation of previous releases, use the drop-down menu on the left and select the desired version.

3rd Party Toolchains¶

A “3rd party toolchain” is an officially supported toolchain provided by an external organization. Several of these are available.

GNU ARM Embedded¶

Warning

Do not install the toolchain into a path with spaces.

Download and install a GNU ARM Embedded build for your operating system and extract it on your file system.

Note

On Windows, we’ll assume you install into the directory C:\gnu_arm_embedded.

Warning

On macOS Catalina or later you might need to change a security policy for the toolchain to be able to run from the terminal.
Set these environment variables:
- Set ZEPHYR_TOOLCHAIN_VARIANT to gnuarmemb.
- Set GNUARMEMB_TOOLCHAIN_PATH to the toolchain installation directory.
To check that you have set these variables correctly in your current environment, follow these example shell sessions (the GNUARMEMB_TOOLCHAIN_PATH values may be different on your system):
```
# Linux, macOS:
$ echo $ZEPHYR_TOOLCHAIN_VARIANT
gnuarmemb
$ echo $GNUARMEMB_TOOLCHAIN_PATH
/home/you/Downloads/gnu_arm_embedded

# Windows:
> echo %ZEPHYR_TOOLCHAIN_VARIANT%
gnuarmemb
> echo %GNUARMEMB_TOOLCHAIN_PATH%
C:\gnu_arm_embedded
```
Warning

On macOS, if you are having trouble with the suggested procedure, there is an unofficial package on brew that might help you. Run brew install gcc-arm-embedded and configure the variables
- Set ZEPHYR_TOOLCHAIN_VARIANT to gnuarmemb.
- Set GNUARMEMB_TOOLCHAIN_PATH to the brew installation directory (something like /usr/local)

Intel oneAPI Toolkit¶

Download Intel oneAPI Base Toolkit
Assuming the toolkit is installed in /opt/intel/oneApi, set environment using:
```
# Linux, macOS:
export ONEAPI_TOOLCHAIN_PATH=/opt/intel/oneapi
source $ONEAPI_TOOLCHAIN_PATH/compiler/latest/env/vars.sh

# Windows:
> set ONEAPI_TOOLCHAIN_PATH=C:\Users\Intel\oneapi
```
To setup the complete oneApi environment, use:
```
source  /opt/intel/oneapi/setvars.sh
```
The above will also change the python environment to the one used by the toolchain and might conflict with what Zephyr uses.
Set ZEPHYR_TOOLCHAIN_VARIANT to oneApi.

DesignWare ARC MetaWare Development Toolkit (MWDT)¶

You need to have ARC MWDT installed on your host.
Set these environment variables:
- Set ZEPHYR_TOOLCHAIN_VARIANT to arcmwdt.
- Set ARCMWDT_TOOLCHAIN_PATH to the toolchain installation directory. MWDT installation provides METAWARE_ROOT so simply set ARCMWDT_TOOLCHAIN_PATH to $METAWARE_ROOT/../ (Linux) or %METAWARE_ROOT%\..\ (Windows)

To check that you have set these variables correctly in your current environment, follow these example shell sessions (the ARCMWDT_TOOLCHAIN_PATH values may be different on your system):

# Linux:
$ echo $ZEPHYR_TOOLCHAIN_VARIANT
arcmwdt
$ echo $ARCMWDT_TOOLCHAIN_PATH
/home/you/ARC/MWDT_2019.12/

# Windows:
> echo %ZEPHYR_TOOLCHAIN_VARIANT%
arcmwdt
> echo %ARCMWDT_TOOLCHAIN_PATH%
C:\ARC\MWDT_2019.12\

Crosstool-NG¶

You can build toolchains from source code using crosstool-NG.

Follow the steps on the crosstool-NG website to prepare your host.
Follow the Zephyr SDK with Crosstool NG instructions to build your toolchain. Repeat as necessary to build toolchains for multiple target architectures.

You will need to clone the sdk-ng repo and run the following command:
```
./go.sh <arch>
```
Note

Currently, only i586 and Arm toolchain builds are verified.
Set these environment variables:
- Set ZEPHYR_TOOLCHAIN_VARIANT to xtools.
- Set XTOOLS_TOOLCHAIN_PATH to the toolchain build directory.
To check that you have set these variables correctly in your current environment, follow these example shell sessions (the XTOOLS_TOOLCHAIN_PATH values may be different on your system):
```
# Linux, macOS:
$ echo $ZEPHYR_TOOLCHAIN_VARIANT
xtools
$ echo $XTOOLS_TOOLCHAIN_PATH
/Volumes/CrossToolNGNew/build/output/
```