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The one page on devicetree is too long. Split it into multiple pages to make it easier to digest and more squintable. This is basically just moving content around; minimal changes have been made apart from redoing some transitions and adding a couple of introductory paragraphs. Rename the 'device-tree' Sphinx :ref: target while we are here. Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
44 lines
1.7 KiB
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44 lines
1.7 KiB
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.. _custom_cmake_toolchains:
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Custom CMake Toolchains
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#######################
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To use a custom toolchain defined in an external CMake file, :ref:`set these
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environment variables <env_vars>`:
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- Set :envvar:`ZEPHYR_TOOLCHAIN_VARIANT` to your toolchain's name
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- Set :envvar:`TOOLCHAIN_ROOT` to the path to the directory containing your
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toolchain's CMake configuration files.
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Zephyr will then include the toolchain cmake files located in the
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:file:`TOOLCHAIN_ROOT` directory:
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- :file:`cmake/toolchain/generic.cmake`: configures the toolchain for "generic"
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use, which mostly means running the C preprocessor on the generated
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:ref:`devicetree` file.
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- :file:`cmake/toolchain/target.cmake`: configures the toolchain for "target"
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use, i.e. building Zephyr and your application's source code.
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See the zephyr files :zephyr_file:`cmake/generic_toolchain.cmake` and
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:zephyr_file:`cmake/target_toolchain.cmake` for more details on what your
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:file:`generic.cmake` and :file:`target.cmake` files should contain.
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You can also set ``ZEPHYR_TOOLCHAIN_VARIANT`` and ``TOOLCHAIN_ROOT`` as CMake
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variables when generating a build system for a Zephyr application, like so:
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.. code-block:: console
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west build ... -- -DZEPHYR_TOOLCHAIN_VARIANT=... -DTOOLCHAIN_ROOT=...
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.. code-block:: console
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cmake -DZEPHYR_TOOLCHAIN_VARIANT=... -DTOOLCHAIN_ROOT=...
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If you do this, ``-C <initial-cache>`` `cmake option`_ may useful. If you save
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your :makevar:`ZEPHYR_TOOLCHAIN_VARIANT`, :makevar:`TOOLCHAIN_ROOT`, and other
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settings in a file named :file:`my-toolchain.cmake`, you can then invoke cmake
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as ``cmake -C my-toolchain.cmake ...`` to save typing.
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.. _cmake option:
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https://cmake.org/cmake/help/latest/manual/cmake.1.html#options
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