62 lines
2.5 KiB
ReStructuredText
62 lines
2.5 KiB
ReStructuredText
.. _other_x_compilers:
|
|
|
|
Other Cross Compilers
|
|
######################
|
|
|
|
This toolchain variant is borrowed from the Linux kernel build system's
|
|
mechanism of using a :envvar:`CROSS_COMPILE` environment variable to set up a
|
|
GNU-based cross toolchain.
|
|
|
|
Examples of such "other cross compilers" are cross toolchains that your Linux
|
|
distribution packaged, that you compiled on your own, or that you downloaded
|
|
from the net. Unlike toolchains specifically listed in
|
|
:ref:`toolchains`, the Zephyr build system may not have been
|
|
tested with them, and doesn't officially support them. (Nonetheless, the
|
|
toolchain set-up mechanism itself is supported.)
|
|
|
|
Follow these steps to use one of these toolchains.
|
|
|
|
#. Install a cross compiler suitable for your host and target systems.
|
|
|
|
For example, you might install the ``gcc-arm-none-eabi`` package on
|
|
Debian-based Linux systems, or ``arm-none-eabi-newlib`` on Fedora or Red
|
|
Hat:
|
|
|
|
.. code-block:: console
|
|
|
|
# On Debian or Ubuntu
|
|
sudo apt-get install gcc-arm-none-eabi
|
|
# On Fedora or Red Hat
|
|
sudo dnf install arm-none-eabi-newlib
|
|
|
|
#. :ref:`Set these environment variables <env_vars>`:
|
|
|
|
- Set :envvar:`ZEPHYR_TOOLCHAIN_VARIANT` to ``cross-compile``.
|
|
- Set :envvar:`CROSS_COMPILE` to the common path prefix which your
|
|
toolchain's binaries have, e.g. the path to the directory containing the
|
|
compiler binaries plus the target triplet and trailing dash.
|
|
|
|
#. To check that you have set these variables correctly in your current
|
|
environment, follow these example shell sessions (the
|
|
:envvar:`CROSS_COMPILE` value may be different on your system):
|
|
|
|
.. code-block:: console
|
|
|
|
# Linux, macOS:
|
|
$ echo $ZEPHYR_TOOLCHAIN_VARIANT
|
|
cross-compile
|
|
$ echo $CROSS_COMPILE
|
|
/usr/bin/arm-none-eabi-
|
|
|
|
You can also set ``CROSS_COMPILE`` as a CMake variable.
|
|
|
|
When using this option, all of your toolchain binaries must reside in the same
|
|
directory and have a common file name prefix. The ``CROSS_COMPILE`` variable
|
|
is set to the directory concatenated with the file name prefix. In the Debian
|
|
example above, the ``gcc-arm-none-eabi`` package installs binaries such as
|
|
``arm-none-eabi-gcc`` and ``arm-none-eabi-ld`` in directory ``/usr/bin/``, so
|
|
the common prefix is ``/usr/bin/arm-none-eabi-`` (including the trailing dash,
|
|
``-``). If your toolchain is installed in ``/opt/mytoolchain/bin`` with binary
|
|
names based on target triplet ``myarch-none-elf``, ``CROSS_COMPILE`` would be
|
|
set to ``/opt/mytoolchain/bin/myarch-none-elf-``.
|