196 lines
6.1 KiB
ReStructuredText
196 lines
6.1 KiB
ReStructuredText
.. _env_vars:
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Environment Variables
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=====================
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Various pages in this documentation refer to setting Zephyr-specific
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environment variables. This page describes how.
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Setting Variables
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*****************
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Option 1: Just Once
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-------------------
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To set the environment variable :envvar:`MY_VARIABLE` to ``foo`` for the
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lifetime of your current terminal window:
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.. tabs::
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.. group-tab:: Linux/macOS
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.. code-block:: console
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export MY_VARIABLE=foo
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.. group-tab:: Windows
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.. code-block:: console
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set MY_VARIABLE=foo
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.. warning::
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This is best for experimentation. If you close your terminal window, use
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another terminal window or tab, restart your computer, etc., this setting
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will be lost forever.
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Using options 2 or 3 is recommended if you want to keep using the setting.
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Option 2: In all Terminals
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--------------------------
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.. tabs::
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.. group-tab:: Linux/macOS
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Add the ``export MY_VARIABLE=foo`` line to your shell's startup script in
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your home directory. For Bash, this is usually :file:`~/.bashrc` on Linux
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or :file:`~/.bash_profile` on macOS. Changes in these startup scripts
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don't affect shell instances already started; try opening a new terminal
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window to get the new settings.
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.. group-tab:: Windows
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You can use the ``setx`` program in ``cmd.exe`` or the third-party RapidEE
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program.
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To use ``setx``, type this command, then close the terminal window. Any
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new ``cmd.exe`` windows will have :envvar:`MY_VARIABLE` set to ``foo``.
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.. code-block:: console
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setx MY_VARIABLE foo
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To install RapidEE, a freeware graphical environment variable editor,
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`using Chocolatey`_ in an Administrator command prompt:
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.. code-block:: console
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choco install rapidee
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You can then run ``rapidee`` from your terminal to launch the program and set
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environment variables. Make sure to use the "User" environment variables area
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-- otherwise, you have to run RapidEE as administrator. Also make sure to save
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your changes by clicking the Save button at top left before exiting.Settings
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you make in RapidEE will be available whenever you open a new terminal window.
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.. _env_vars_zephyrrc:
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Option 3: Using ``zephyrrc`` files
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----------------------------------
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Choose this option if you don't want to make the variable's setting available
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to all of your terminals, but still want to save the value for loading into
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your environment when you are using Zephyr.
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.. tabs::
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.. group-tab:: Linux/macOS
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Create a file named :file:`~/.zephyrrc` if it doesn't exist, then add this
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line to it:
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.. code-block:: console
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export MY_VARIABLE=foo
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To get this value back into your current terminal environment, **you must
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run** ``source zephyr-env.sh`` from the main ``zephyr`` repository. Among
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other things, this script sources :file:`~/.zephyrrc`.
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The value will be lost if you close the window, etc.; run ``source
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zephyr-env.sh`` again to get it back.
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.. group-tab:: Windows
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Add the line ``set MY_VARIABLE=foo`` to the file
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:file:`%userprofile%\\zephyrrc.cmd` using a text editor such as Notepad to
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save the value.
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To get this value back into your current terminal environment, **you must
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run** ``zephyr-env.cmd`` in a ``cmd.exe`` window after changing directory
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to the main ``zephyr`` repository. Among other things, this script runs
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:file:`%userprofile%\\zephyrrc.cmd`.
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The value will be lost if you close the window, etc.; run
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``zephyr-env.cmd`` again to get it back.
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These scripts:
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- set :envvar:`ZEPHYR_BASE` (see below) to the location of the zephyr
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repository
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- adds some Zephyr-specific locations (such as zephyr's :file:`scripts`
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directory) to your :envvar:`PATH` environment variable
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- loads any settings from the ``zephyrrc`` files described above in
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:ref:`env_vars_zephyrrc`.
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You can thus use them any time you need any of these settings.
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.. _zephyr-env:
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Zephyr Environment Scripts
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**************************
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You can use the zephyr repository scripts ``zephyr-env.sh`` (for macOS and
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Linux) and ``zephyr-env.cmd`` (for Windows) to load Zephyr-specific settings
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into your current terminal's environment. To do so, run this command from the
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zephyr repository:
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.. tabs::
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.. group-tab:: Linux/macOS
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.. code-block:: console
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source zephyr-env.sh
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.. group-tab:: Windows
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.. code-block:: console
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zephyr-env.cmd
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These scripts:
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- set :envvar:`ZEPHYR_BASE` (see below) to the location of the zephyr
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repository
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- adds some Zephyr-specific locations (such as zephyr's :file:`scripts`
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directory) to your :envvar:`PATH` environment variable
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- loads any settings from the ``zephyrrc`` files described above in
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:ref:`env_vars_zephyrrc`.
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You can thus use them any time you need any of these settings.
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.. _env_vars_important:
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Important Environment Variables
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*******************************
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Some :ref:`important-build-vars` can also be set in the environment. Here
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is a description of some of these important environment variables. This is not
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a comprehensive list.
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- :envvar:`BOARD`
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- :envvar:`CONF_FILE`
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- :envvar:`SHIELD`
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- :envvar:`ZEPHYR_BASE`
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- :envvar:`ZEPHYR_EXTRA_MODULES`
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- :envvar:`ZEPHYR_MODULES`
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The following additional environment variables are significant when configuring
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the :ref:`toolchain <gs_toolchain>` used to build Zephyr applications.
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- :envvar:`ZEPHYR_TOOLCHAIN_VARIANT`: the name of the toolchain to use
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- :envvar:`<TOOLCHAIN>_TOOLCHAIN_PATH`: path to the toolchain specified by
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:envvar:`ZEPHYR_TOOLCHAIN_VARIANT`. For example, if
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``ZEPHYR_TOOLCHAIN_VARIANT=llvm``, use :envvar:`LLVM_TOOLCHAIN_PATH`. (Note
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the capitalization when forming the environment variable name.)
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Emulators and boards may also depend on additional programs. The build system
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will try to locate those programs automatically, but may rely on additional
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CMake or environment variables to do so. Please consult your emulator's or
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board's documentation for more information.
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.. _using Chocolatey: https://chocolatey.org/packages/RapidEE
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