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diff --git a/documentation/sdk-manual/extensible.rst b/documentation/sdk-manual/extensible.rst index 81727e6f28..3f6a754d88 100644 --- a/documentation/sdk-manual/extensible.rst +++ b/documentation/sdk-manual/extensible.rst @@ -15,9 +15,8 @@ hardware, and ease integration into the rest of the .. note:: For a side-by-side comparison of main features supported for an - extensible SDK as compared to a standard SDK, see the " - Introduction - " section. + extensible SDK as compared to a standard SDK, see the + :ref:`sdk-manual/intro:introduction` section. In addition to the functionality available through ``devtool``, you can alternatively make use of the toolchain directly, for example from @@ -42,6 +41,46 @@ functionality. Installing the Extensible SDK ============================= +Two ways to install the Extensible SDK +-------------------------------------- + +Extensible SDK can be installed in two different ways, and both have +their own pros and cons: + +#. *Setting up the Extensible SDK environment directly in a Yocto build*. This + avoids having to produce, test, distribute and maintain separate SDK + installer archives, which can get very large. There is only one environment + for the regular Yocto build and the SDK and less code paths where things can + go not according to plan. It's easier to update the SDK: it simply means + updating the Yocto layers with git fetch or layer management tooling. The + SDK extensibility is better than in the second option: just run ``bitbake`` + again to add more things to the sysroot, or add layers if even more things + are required. + +#. *Setting up the Extensible SDK from a standalone installer*. This has the + benefit of having a single, self-contained archive that includes all the + needed binary artifacts. So nothing needs to be rebuilt, and there is no + need to provide a well-functioning binary artefact cache over the network + for developers with underpowered laptops. + +.. _setting_up_ext_sdk_in_build: + +Setting up the Extensible SDK environment directly in a Yocto build +------------------------------------------------------------------- + +#. Set up all the needed layers and a Yocto :term:`Build Directory`, e.g. a regular Yocto + build where ``bitbake`` can be executed. + +#. Run:: + + $ bitbake meta-ide-support + $ bitbake -c populate_sysroot gtk+3 + # or any other target or native item that the application developer would need + $ bitbake build-sysroots -c build_native_sysroot && bitbake build-sysroots -c build_target_sysroot + +Setting up the Extensible SDK from a standalone installer +--------------------------------------------------------- + The first thing you need to do is install the SDK on your :term:`Build Host` by running the ``*.sh`` installation script. @@ -89,9 +128,9 @@ the SDK for ``core-image-sato`` and using the current &DISTRO; snapshot:: .. note:: As an alternative to downloading an SDK, you can build the SDK - installer. For information on building the installer, see the " - Building an SDK Installer - " section. + installer. For information on building the installer, see the + :ref:`sdk-manual/appendix-obtain:building an sdk installer` + section. The SDK and toolchains are self-contained and by default are installed into the ``poky_sdk`` folder in your home directory. You can choose to @@ -103,16 +142,7 @@ must be writable for whichever users need to use the SDK. The following command shows how to run the installer given a toolchain tarball for a 64-bit x86 development host system and a 64-bit x86 target architecture. The example assumes the SDK installer is located in -``~/Downloads/`` and has execution rights. - -.. note:: - - If you do not have write permissions for the directory into which you - are installing the SDK, the installer notifies you and exits. For - that case, set up the proper permissions in the directory and run the - installer again. - -:: +``~/Downloads/`` and has execution rights:: $ ./Downloads/poky-glibc-x86_64-core-image-minimal-core2-64-toolchain-ext-2.5.sh Poky (Yocto Project Reference Distro) Extensible SDK installer version 2.5 @@ -133,11 +163,25 @@ architecture. The example assumes the SDK installer is located in Each time you wish to use the SDK in a new shell session, you need to source the environment setup script e.g. $ . /home/scottrif/poky_sdk/environment-setup-core2-64-poky-linux +.. note:: + + If you do not have write permissions for the directory into which you + are installing the SDK, the installer notifies you and exits. For + that case, set up the proper permissions in the directory and run the + installer again. + +.. _running_the_ext_sdk_env: + Running the Extensible SDK Environment Setup Script =================================================== Once you have the SDK installed, you must run the SDK environment setup -script before you can actually use the SDK. This setup script resides in +script before you can actually use the SDK. + +When using a SDK directly in a Yocto build, you will find the script in +``tmp/deploy/images/qemux86-64/`` in your :term:`Build Directory`. + +When using a standalone SDK installer, this setup script resides in the directory you chose when you installed the SDK, which is either the default ``poky_sdk`` directory or the directory you chose during installation. @@ -155,13 +199,18 @@ script is for an IA-based target machine using i586 tuning:: SDK environment now set up; additionally you may now run devtool to perform development tasks. Run devtool --help for further details. -Running the setup script defines many environment variables needed in -order to use the SDK (e.g. ``PATH``, -:term:`CC`, -:term:`LD`, and so forth). If you want to -see all the environment variables the script exports, examine the +When using the environment script directly in a Yocto build, it can +be run similarly:: + + $ source tmp/deploy/images/qemux86-64/environment-setup-core2-64-poky-linux + +Running the setup script defines many environment variables needed in order to +use the SDK (e.g. ``PATH``, :term:`CC`, :term:`LD`, and so forth). If you want +to see all the environment variables the script exports, examine the installation file itself. +.. _using_devtool: + Using ``devtool`` in Your SDK Workflow ====================================== @@ -173,11 +222,8 @@ system. .. note:: - The use of - devtool - is not limited to the extensible SDK. You can use - devtool - to help you easily develop any project whose build output must be + The use of ``devtool`` is not limited to the extensible SDK. You can use + ``devtool`` to help you easily develop any project whose build output must be part of an image built using the build system. The ``devtool`` command line is organized similarly to @@ -187,21 +233,18 @@ all the commands. .. note:: - See the " - devtool - Quick Reference - " in the Yocto Project Reference Manual for a - devtool - quick reference. + See the ":doc:`/ref-manual/devtool-reference`" + section in the Yocto Project Reference Manual. -Three ``devtool`` subcommands exist that provide entry-points into -development: +``devtool`` subcommands provide entry-points into development: - *devtool add*: Assists in adding new software to be built. - *devtool modify*: Sets up an environment to enable you to modify the source of an existing component. +- *devtool ide-sdk*: Generates a configuration for an IDE. + - *devtool upgrade*: Updates an existing recipe so that you can build it for an updated set of source files. @@ -234,9 +277,9 @@ shows common development flows you would use with the ``devtool add`` command: .. image:: figures/sdk-devtool-add-flow.png - :align: center + :width: 100% -1. *Generating the New Recipe*: The top part of the flow shows three +#. *Generating the New Recipe*: The top part of the flow shows three scenarios by which you could use ``devtool add`` to generate a recipe based on existing source code. @@ -253,7 +296,7 @@ command: - *Left*: The left scenario in the figure represents a common situation where the source code does not exist locally and needs to be extracted. In this situation, the source code is extracted - to the default workspace - you do not want the files in some + to the default workspace --- you do not want the files in some specific location outside of the workspace. Thus, everything you need will be located in the workspace:: @@ -268,30 +311,28 @@ command: - *Middle*: The middle scenario in the figure also represents a situation where the source code does not exist locally. In this case, the code is again upstream and needs to be extracted to some - local area - this time outside of the default workspace. + local area --- this time outside of the default workspace. .. note:: - If required, - devtool - always creates a Git repository locally during the extraction. + If required, ``devtool`` always creates a Git repository locally + during the extraction. - Furthermore, the first positional argument srctree in this case + Furthermore, the first positional argument ``srctree`` in this case identifies where the ``devtool add`` command will locate the extracted code outside of the workspace. You need to specify an empty directory:: $ devtool add recipe srctree fetchuri - In summary, - the source code is pulled from fetchuri and extracted into the - location defined by srctree as a local Git repository. + In summary, the source code is pulled from fetchuri and extracted into the + location defined by ``srctree`` as a local Git repository. Within workspace, ``devtool`` creates a recipe named recipe along with an associated append file. - *Right*: The right scenario in the figure represents a situation - where the srctree has been previously prepared outside of the + where the ``srctree`` has been previously prepared outside of the ``devtool`` workspace. The following command provides a new recipe name and identifies @@ -303,28 +344,26 @@ command: recipe for the code and places the recipe into the workspace. Because the extracted source code already exists, ``devtool`` does - not try to relocate the source code into the workspace - only the + not try to relocate the source code into the workspace --- only the new recipe is placed in the workspace. Aside from a recipe folder, the command also creates an associated append folder and places an initial ``*.bbappend`` file within. -2. *Edit the Recipe*: You can use ``devtool edit-recipe`` to open up the +#. *Edit the Recipe*: You can use ``devtool edit-recipe`` to open up the editor as defined by the ``$EDITOR`` environment variable and modify the file:: $ devtool edit-recipe recipe - From within the editor, you - can make modifications to the recipe that take affect when you build - it later. + From within the editor, you can make modifications to the recipe that + take effect when you build it later. -3. *Build the Recipe or Rebuild the Image*: The next step you take +#. *Build the Recipe or Rebuild the Image*: The next step you take depends on what you are going to do with the new code. If you need to eventually move the build output to the target - hardware, use the following ``devtool`` command: - :; + hardware, use the following ``devtool`` command:: $ devtool build recipe @@ -335,7 +374,7 @@ command: $ devtool build-image image -4. *Deploy the Build Output*: When you use the ``devtool build`` command +#. *Deploy the Build Output*: When you use the ``devtool build`` command to build out your recipe, you probably want to see if the resulting build output works as expected on the target hardware. @@ -349,20 +388,22 @@ command: development machine. You can deploy your build output to that target hardware by using the - ``devtool deploy-target`` command: $ devtool deploy-target recipe - target The target is a live target machine running as an SSH server. + ``devtool deploy-target`` command:: + + $ devtool deploy-target recipe target + + The target is a live target machine running as an SSH server. You can, of course, also deploy the image you build to actual hardware by using the ``devtool build-image`` command. However, ``devtool`` does not provide a specific command that allows you to deploy the image to actual hardware. -5. *Finish Your Work With the Recipe*: The ``devtool finish`` command +#. *Finish Your Work With the Recipe*: The ``devtool finish`` command creates any patches corresponding to commits in the local Git repository, moves the new recipe to a more permanent layer, and then resets the recipe so that the recipe is built normally rather than - from the workspace. - :: + from the workspace:: $ devtool finish recipe layer @@ -380,11 +421,9 @@ command: .. note:: - You can use the - devtool reset - command to put things back should you decide you do not want to - proceed with your work. If you do use this command, realize that - the source tree is preserved. + You can use the ``devtool reset`` command to put things back should you + decide you do not want to proceed with your work. If you do use this + command, realize that the source tree is preserved. Use ``devtool modify`` to Modify the Source of an Existing Component -------------------------------------------------------------------- @@ -402,9 +441,9 @@ diagram shows common development flows for the ``devtool modify`` command: .. image:: figures/sdk-devtool-modify-flow.png - :align: center + :width: 100% -1. *Preparing to Modify the Code*: The top part of the flow shows three +#. *Preparing to Modify the Code*: The top part of the flow shows three scenarios by which you could use ``devtool modify`` to prepare to work on source files. Each scenario assumes the following: @@ -431,15 +470,13 @@ command: $ devtool modify recipe - Once - ``devtool``\ locates the recipe, ``devtool`` uses the recipe's - :term:`SRC_URI` statements to - locate the source code and any local patch files from other - developers. + Once ``devtool`` locates the recipe, ``devtool`` uses the recipe's + :term:`SRC_URI` statements to locate the source code and any local + patch files from other developers. - With this scenario, no srctree argument exists. Consequently, the + With this scenario, there is no ``srctree`` argument. Consequently, the default behavior of the ``devtool modify`` command is to extract - the source files pointed to by the ``SRC_URI`` statements into a + the source files pointed to by the :term:`SRC_URI` statements into a local Git structure. Furthermore, the location for the extracted source is the default area within the ``devtool`` workspace. The result is that the command sets up both the source code and an @@ -447,7 +484,7 @@ command: original location. Additionally, if you have any non-patch local files (i.e. files - referred to with ``file://`` entries in ``SRC_URI`` statement + referred to with ``file://`` entries in :term:`SRC_URI` statement excluding ``*.patch/`` or ``*.diff``), these files are copied to an ``oe-local-files`` folder under the newly created source tree. Copying the files here gives you a convenient area from which you @@ -471,33 +508,29 @@ command: .. note:: - You cannot provide a URL for - srctree - using the - devtool - command. + You cannot provide a URL for ``srctree`` using the ``devtool`` command. - As with all extractions, the command uses the recipe's ``SRC_URI`` + As with all extractions, the command uses the recipe's :term:`SRC_URI` statements to locate the source files and any associated patch files. Non-patch files are copied to an ``oe-local-files`` folder under the newly created source tree. Once the files are located, the command by default extracts them - into srctree. + into ``srctree``. Within workspace, ``devtool`` creates an append file for the recipe. The recipe remains in its original location but the source - files are extracted to the location you provide with srctree. + files are extracted to the location you provide with ``srctree``. - *Right*: The right scenario in the figure represents a situation - where the source tree (srctree) already exists locally as a + where the source tree (``srctree``) already exists locally as a previously extracted Git structure outside of the ``devtool`` workspace. In this example, the recipe also exists elsewhere locally in its own layer. The following command tells ``devtool`` the recipe with which to work, uses the "-n" option to indicate source does not need to be - extracted, and uses srctree to point to the previously extracted + extracted, and uses ``srctree`` to point to the previously extracted source files:: $ devtool modify -n recipe srctree @@ -513,11 +546,11 @@ command: append file for the recipe in the ``devtool`` workspace. The recipe and the source code remain in their original locations. -2. *Edit the Source*: Once you have used the ``devtool modify`` command, +#. *Edit the Source*: Once you have used the ``devtool modify`` command, you are free to make changes to the source files. You can use any editor you like to make and save your source code modifications. -3. *Build the Recipe or Rebuild the Image*: The next step you take +#. *Build the Recipe or Rebuild the Image*: The next step you take depends on what you are going to do with the new code. If you need to eventually move the build output to the target @@ -528,9 +561,11 @@ command: On the other hand, if you want an image to contain the recipe's packages from the workspace for immediate deployment onto a device (e.g. for testing purposes), you can use the ``devtool build-image`` - command: $ devtool build-image image + command:: + + $ devtool build-image image -4. *Deploy the Build Output*: When you use the ``devtool build`` command +#. *Deploy the Build Output*: When you use the ``devtool build`` command to build out your recipe, you probably want to see if the resulting build output works as expected on target hardware. @@ -555,13 +590,12 @@ command: ``devtool`` does not provide a specific command to deploy the image to actual hardware. -5. *Finish Your Work With the Recipe*: The ``devtool finish`` command +#. *Finish Your Work With the Recipe*: The ``devtool finish`` command creates any patches corresponding to commits in the local Git repository, updates the recipe to point to them (or creates a ``.bbappend`` file to do so, depending on the specified destination layer), and then resets the recipe so that the recipe is built - normally rather than from the workspace. - :: + normally rather than from the workspace:: $ devtool finish recipe layer @@ -569,8 +603,7 @@ command: Any changes you want to turn into patches must be staged and committed within the local Git repository before you use the - devtool finish - command. + ``devtool finish`` command. Because there is no need to move the recipe, ``devtool finish`` either updates the original recipe in the original layer or the @@ -585,11 +618,282 @@ command: .. note:: - You can use the - devtool reset - command to put things back should you decide you do not want to - proceed with your work. If you do use this command, realize that - the source tree is preserved. + You can use the ``devtool reset`` command to put things back should you + decide you do not want to proceed with your work. If you do use this + command, realize that the source tree is preserved. + +``devtool ide-sdk`` configures IDEs for the extensible SDK +---------------------------------------------------------- + +``devtool ide-sdk`` automatically configures IDEs to use the extensible SDK. +To make sure that all parts of the extensible SDK required by the generated +IDE configuration are available, ``devtool ide-sdk`` uses BitBake in the +background to bootstrap the extensible SDK. + +The extensible SDK supports two different development modes. +``devtool ide-sdk`` supports both of them: + +#. *Modified mode*: + + By default ``devtool ide-sdk`` generates IDE configurations for recipes in + workspaces created by ``devtool modify`` or ``devtool add`` as described in + :ref:`using_devtool`. This mode creates IDE configurations with support for + advanced features, such as deploying the binaries to the remote target + device and performing remote debugging sessions. The generated IDE + configurations use the per recipe sysroots as Bitbake does internally. + + In order to use the tool, a few settings are needed. As a starting example, + the following lines of code can be added to the ``local.conf`` file:: + + # Build the companion debug file system + IMAGE_GEN_DEBUGFS = "1" + # Optimize build time: with devtool ide-sdk the dbg tar is not needed + IMAGE_FSTYPES_DEBUGFS = "" + # Without copying the binaries into roofs-dbg, GDB does not find all source files. + IMAGE_CLASSES += "image-combined-dbg" + + # SSH is mandatory, no password simplifies the usage + EXTRA_IMAGE_FEATURES += "\ + ssh-server-openssh \ + debug-tweaks \ + " + + # Remote debugging needs gdbserver on the target device + IMAGE_INSTALL:append = " gdbserver" + + # Add the recipes which should be modified to the image + # Otherwise some dependencies might be missing. + IMAGE_INSTALL:append = " my-recipe" + + Assuming the BitBake environment is set up correctly and a workspace has + been created for the recipe using ``devtool modify my-recipe``, the + following command can create the SDK and the configuration for VSCode in + the recipe workspace:: + + $ devtool ide-sdk my-recipe core-image-minimal --target root@192.168.7.2 + + The command requires an image recipe (``core-image-minimal`` for this example) + that is used to create the SDK. This firmware image should also be installed + on the target device. It is possible to pass multiple package recipes. + ``devtool ide-sdk`` tries to create an IDE configuration for all package + recipes. + + What this command does exactly depends on the recipe, more precisely on the + build tool used by the recipe. The basic idea is to configure the IDE so + that it calls the build tool exactly as ``bitbake`` does. + + For example, a CMake preset is created for a recipe that inherits + :ref:`ref-classes-cmake`. In the case of VSCode, CMake presets are supported + by the CMake Tools plugin. This is an example of how the build + configuration used by ``bitbake`` is exported to an IDE configuration that + gives exactly the same build results. + + Support for remote debugging with seamless integration into the IDE is + important for a cross-SDK. ``devtool ide-sdk`` automatically generates the + necessary helper scripts for deploying the compiled artifacts to the target + device as well as the necessary configuration for the debugger and the IDE. + + .. note:: + + To ensure that the debug symbols on the build machine match the binaries + running on the target device, it is essential that the image built by + ``devtool ide-sdk`` is running on the target device. + + ``devtool ide-sdk`` aims to support multiple programming languages and + multiple IDEs natively. "Natively" means that the IDE is configured to call + the build tool (e.g. CMake or Meson) directly. This has several advantages. + First of all, it is much faster than ``devtool build``, but it also allows + to use the very good integration of tools like CMake or GDB in VSCode and + other IDEs. However, supporting many programming languages and multiple + IDEs is quite an elaborate and constantly evolving thing. Support for IDEs + is therefore implemented as plugins. Plugins can also be provided by + optional layers. + + The default IDE is VSCode. Some hints about using VSCode: + + - To work on the source code of a recipe an instance of VSCode is started in + the recipe's workspace. Example:: + + code build/workspace/sources/my-recipe + + - To work with CMake press ``Ctrl + Shift + p``, type ``cmake``. This will + show some possible commands like selecting a CMake preset, compiling or + running CTest. + + For recipes inheriting :ref:`ref-classes-cmake-qemu` rather than + :ref:`ref-classes-cmake`, executing cross-compiled unit tests on the host + can be supported transparently with QEMU user-mode. + + - To work with Meson press ``Ctrl + Shift + p``, type ``meson``. This will + show some possible commands like compiling or executing the unit tests. + + A note on running cross-compiled unit tests on the host: Meson enables + support for QEMU user-mode by default. It is expected that the execution + of the unit tests from the IDE will work easily without any additional + steps, provided that the code is suitable for execution on the host + machine. + + - For the deployment to the target device, just press ``Ctrl + Shift + p``, + type ``task``. Select ``install && deploy-target``. + + - For remote debugging, switch to the debugging view by pressing the "play" + button with the ``bug icon`` on the left side. This will provide a green + play button with a drop-down list where a debug configuration can be + selected. After selecting one of the generated configurations, press the + "play" button. + + Starting a remote debugging session automatically initiates the deployment + to the target device. If this is not desired, the + ``"dependsOn": ["install && deploy-target...]`` parameter of the tasks + with ``"label": "gdbserver start...`` can be removed from the + ``tasks.json`` file. + + VSCode supports GDB with many different setups and configurations for many + different use cases. However, most of these setups have some limitations + when it comes to cross-development, support only a few target + architectures or require a high performance target device. Therefore + ``devtool ide-sdk`` supports the classic, generic setup with GDB on the + development host and gdbserver on the target device. + + Roughly summarized, this means: + + - The binaries are copied via SSH to the remote target device by a script + referred by ``tasks.json``. + + - gdbserver is started on the remote target device via SSH by a script + referred by ``tasks.json``. + + Changing the parameters that are passed to the debugging executable + requires modifying the generated script. The script is located at + ``oe-scripts/gdbserver_*``. Defining the parameters in the ``args`` + field in the ``launch.json`` file does not work. + + - VSCode connects to gdbserver as documented in + `Remote debugging or debugging with a local debugger server + <https://code.visualstudio.com/docs/cpp/launch-json-reference#_remote-debugging-or-debugging-with-a-local-debugger-server>`__. + + Additionally ``--ide=none`` is supported. With the ``none`` IDE parameter, + some generic configuration files like ``gdbinit`` files and some helper + scripts starting gdbserver remotely on the target device as well as the GDB + client on the host are generated. + + Here is a usage example for the ``cmake-example`` recipe from the + ``meta-selftest`` layer which inherits :ref:`ref-classes-cmake-qemu`: + + .. code-block:: sh + + # Create the SDK + devtool modify cmake-example + devtool ide-sdk cmake-example core-image-minimal -c --debug-build-config --ide=none + + # Install the firmware on a target device or start QEMU + runqemu + + # From exploring the workspace of cmake-example + cd build/workspace/sources/cmake-example + + # Find cmake-native and save the path into a variable + # Note: using just cmake instead of $CMAKE_NATIVE would work in many cases + CMAKE_NATIVE="$(jq -r '.configurePresets[0] | "\(.cmakeExecutable)"' CMakeUserPresets.json)" + + # List available CMake presets + "$CMAKE_NATIVE" --list-presets + Available configure presets: + + "cmake-example-cortexa57" - cmake-example: cortexa57 + + # Re-compile the already compiled sources + "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 + ninja: no work to do. + # Do a clean re-build + "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target clean + [1/1] Cleaning all built files... + Cleaning... 8 files. + "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target all + [7/7] Linking CXX executable cmake-example + + # Run the cross-compiled unit tests with QEMU user-mode + "$CMAKE_NATIVE" --build --preset cmake-example-cortexa57 --target test + [0/1] Running tests... + Test project .../build/tmp/work/cortexa57-poky-linux/cmake-example/1.0/cmake-example-1.0 + Start 1: test-cmake-example + 1/1 Test #1: test-cmake-example ............... Passed 0.03 sec + + 100% tests passed, 0 tests failed out of 1 + + Total Test time (real) = 0.03 sec + + # Using CTest directly is possible as well + CTEST_NATIVE="$(dirname "$CMAKE_NATIVE")/ctest" + + # List available CMake presets + "$CTEST_NATIVE" --list-presets + Available test presets: + + "cmake-example-cortexa57" - cmake-example: cortexa57 + + # Run the cross-compiled unit tests with QEMU user-mode + "$CTEST_NATIVE" --preset "cmake-example-cortexa57" + Test project ...build/tmp/work/cortexa57-poky-linux/cmake-example/1.0/cmake-example-1.0 + Start 1: test-cmake-example + 1/1 Test #1: test-cmake-example ............... Passed 0.03 sec + + 100% tests passed, 0 tests failed out of 1 + + Total Test time (real) = 0.03 sec + + # Deploying the new build to the target device (default is QEUM at 192.168.7.2) + oe-scripts/install_and_deploy_cmake-example-cortexa57 + + # Start a remote debugging session with gdbserver on the target and GDB on the host + oe-scripts/gdbserver_1234_usr-bin-cmake-example_m + oe-scripts/gdb_1234_usr-bin-cmake-example + break main + run + step + stepi + continue + quit + + # Stop gdbserver on the target device + oe-scripts/gdbserver_1234_usr-bin-cmake-example_m stop + +#. *Shared sysroots mode* + + For some recipes and use cases a per-recipe sysroot based SDK is not + suitable. Optionally ``devtool ide-sdk`` configures the IDE to use the + toolchain provided by the extensible SDK as described in + :ref:`running_the_ext_sdk_env`. ``devtool ide-sdk --mode=shared`` is + basically a wrapper for the setup of the extensible SDK as described in + :ref:`setting_up_ext_sdk_in_build`. The IDE gets a configuration to use the + shared sysroots. + + Creating a SDK with shared sysroots that contains all the dependencies needed + to work with ``my-recipe`` is possible with the following example command:: + + $ devtool ide-sdk --mode=shared my-recipe + + For VSCode the cross-toolchain is exposed as a CMake kit. CMake kits are + defined in ``~/.local/share/CMakeTools/cmake-tools-kits.json``. + The following example shows how the cross-toolchain can be selected in + VSCode. First of all we need a folder containing a CMake project. + For this example, let's create a CMake project and start VSCode:: + + mkdir kit-test + echo "project(foo VERSION 1.0)" > kit-test/CMakeLists.txt + code kit-test + + If there is a CMake project in the workspace, cross-compilation is supported: + + - Press ``Ctrl + Shift + P``, type ``CMake: Scan for Kits`` + - Press ``Ctrl + Shift + P``, type ``CMake: Select a Kit`` + + Finally most of the features provided by CMake and the IDE should be available. + + Other IDEs than VSCode are supported as well. However, + ``devtool ide-sdk --mode=shared --ide=none my-recipe`` is currently + just a simple wrapper for the setup of the extensible SDK, as described in + :ref:`setting_up_ext_sdk_in_build`. Use ``devtool upgrade`` to Create a Version of the Recipe that Supports a Newer Version of the Software ------------------------------------------------------------------------------------------------------- @@ -603,27 +907,25 @@ counterparts. .. note:: - Several methods exist by which you can upgrade recipes - - devtool upgrade - happens to be one. You can read about all the methods by which you - can upgrade recipes in the " - Upgrading Recipes - " section of the Yocto Project Development Tasks Manual. + Several methods exist by which you can upgrade recipes --- + ``devtool upgrade`` happens to be one. You can read about all the methods by + which you can upgrade recipes in the + :ref:`dev-manual/upgrading-recipes:upgrading recipes` section of the Yocto + Project Development Tasks Manual. -The ``devtool upgrade`` command is flexible enough to allow you to -specify source code revision and versioning schemes, extract code into -or out of the ``devtool`` -:ref:`devtool-the-workspace-layer-structure`, -and work with any source file forms that the -:ref:`fetchers <bitbake:bitbake-user-manual/bitbake-user-manual-fetching:fetchers>` support. +The ``devtool upgrade`` command is flexible enough to allow you to specify +source code revision and versioning schemes, extract code into or out of the +``devtool`` :ref:`devtool-the-workspace-layer-structure`, and work with any +source file forms that the +:ref:`bitbake-user-manual/bitbake-user-manual-fetching:fetchers` support. The following diagram shows the common development flow used with the ``devtool upgrade`` command: .. image:: figures/sdk-devtool-upgrade-flow.png - :align: center + :width: 100% -1. *Initiate the Upgrade*: The top part of the flow shows the typical +#. *Initiate the Upgrade*: The top part of the flow shows the typical scenario by which you use the ``devtool upgrade`` command. The following conditions exist: @@ -646,8 +948,9 @@ The following diagram shows the common development flow used with the code into the ``sources`` directory in the :ref:`devtool-the-workspace-layer-structure`. If you want the code extracted to any other location, you need to - provide the srctree positional argument with the command as follows: - $ devtool upgrade -V version recipe srctree + provide the ``srctree`` positional argument with the command as follows:: + + $ devtool upgrade -V version recipe srctree .. note:: @@ -655,18 +958,18 @@ The following diagram shows the common development flow used with the don't use "-V", the command upgrades the recipe to the latest version. - If the source files pointed to by the ``SRC_URI`` statement in the + If the source files pointed to by the :term:`SRC_URI` statement in the recipe are in a Git repository, you must provide the "-S" option and specify a revision for the software. - Once ``devtool`` locates the recipe, it uses the ``SRC_URI`` variable + Once ``devtool`` locates the recipe, it uses the :term:`SRC_URI` variable to locate the source code and any local patch files from other developers. The result is that the command sets up the source code, the new version of the recipe, and an append file all within the workspace. Additionally, if you have any non-patch local files (i.e. files - referred to with ``file://`` entries in ``SRC_URI`` statement + referred to with ``file://`` entries in :term:`SRC_URI` statement excluding ``*.patch/`` or ``*.diff``), these files are copied to an ``oe-local-files`` folder under the newly created source tree. Copying the files here gives you a convenient area from which you can @@ -674,9 +977,9 @@ The following diagram shows the common development flow used with the are incorporated into the build the next time you build the software just as are other changes you might have made to the source. -2. *Resolve any Conflicts created by the Upgrade*: Conflicts could exist - due to the software being upgraded to a new version. Conflicts occur - if your recipe specifies some patch files in ``SRC_URI`` that +#. *Resolve any Conflicts created by the Upgrade*: Conflicts could happen + after upgrading the software to a new version. Conflicts occur + if your recipe specifies some patch files in :term:`SRC_URI` that conflict with changes made in the new version of the software. For such cases, you need to resolve the conflicts by editing the source and following the normal ``git rebase`` conflict resolution process. @@ -685,7 +988,7 @@ The following diagram shows the common development flow used with the conflicts created through use of a newer or different version of the software. -3. *Build the Recipe or Rebuild the Image*: The next step you take +#. *Build the Recipe or Rebuild the Image*: The next step you take depends on what you are going to do with the new code. If you need to eventually move the build output to the target @@ -700,7 +1003,7 @@ The following diagram shows the common development flow used with the $ devtool build-image image -4. *Deploy the Build Output*: When you use the ``devtool build`` command +#. *Deploy the Build Output*: When you use the ``devtool build`` command or ``bitbake`` to build your recipe, you probably want to see if the resulting build output works as expected on target hardware. @@ -714,15 +1017,18 @@ The following diagram shows the common development flow used with the development machine. You can deploy your build output to that target hardware by using the - ``devtool deploy-target`` command: $ devtool deploy-target recipe - target The target is a live target machine running as an SSH server. + ``devtool deploy-target`` command:: + + $ devtool deploy-target recipe target + + The target is a live target machine running as an SSH server. You can, of course, also deploy the image you build using the ``devtool build-image`` command to actual hardware. However, ``devtool`` does not provide a specific command that allows you to do this. -5. *Finish Your Work With the Recipe*: The ``devtool finish`` command +#. *Finish Your Work With the Recipe*: The ``devtool finish`` command creates any patches corresponding to commits in the local Git repository, moves the new recipe to a more permanent layer, and then resets the recipe so that the recipe is built normally rather than @@ -734,8 +1040,7 @@ The following diagram shows the common development flow used with the If you specify a destination layer that is the same as the original source, then the old version of the recipe and associated files are - removed prior to adding the new version. - :: + removed prior to adding the new version:: $ devtool finish recipe layer @@ -750,11 +1055,9 @@ The following diagram shows the common development flow used with the .. note:: - You can use the - devtool reset - command to put things back should you decide you do not want to - proceed with your work. If you do use this command, realize that - the source tree is preserved. + You can use the ``devtool reset`` command to put things back should you + decide you do not want to proceed with your work. If you do use this + command, realize that the source tree is preserved. A Closer Look at ``devtool add`` ================================ @@ -822,30 +1125,27 @@ run ``devtool add`` again and provide the name or the version. Dependency Detection and Mapping -------------------------------- -The ``devtool add`` command attempts to detect build-time dependencies -and map them to other recipes in the system. During this mapping, the -command fills in the names of those recipes as part of the -:term:`DEPENDS` variable within the +The ``devtool add`` command attempts to detect build-time dependencies and map +them to other recipes in the system. During this mapping, the command fills in +the names of those recipes as part of the :term:`DEPENDS` variable within the recipe. If a dependency cannot be mapped, ``devtool`` places a comment in the recipe indicating such. The inability to map a dependency can result from naming not being recognized or because the dependency simply is not available. For cases where the dependency is not available, you must use the ``devtool add`` command to add an additional recipe that satisfies the dependency. Once you add that recipe, you need to update -the ``DEPENDS`` variable in the original recipe to include the new +the :term:`DEPENDS` variable in the original recipe to include the new recipe. If you need to add runtime dependencies, you can do so by adding the following to your recipe:: - RDEPENDS_${PN} += "dependency1 dependency2 ..." + RDEPENDS:${PN} += "dependency1 dependency2 ..." .. note:: - The - devtool add - command often cannot distinguish between mandatory and optional - dependencies. Consequently, some of the detected dependencies might + The ``devtool add`` command often cannot distinguish between mandatory and + optional dependencies. Consequently, some of the detected dependencies might in fact be optional. When in doubt, consult the documentation or the configure script for the software the recipe is building for further details. In some cases, you might find you can substitute the @@ -855,30 +1155,28 @@ following to your recipe:: License Detection ----------------- -The ``devtool add`` command attempts to determine if the software you -are adding is able to be distributed under a common, open-source -license. If so, the command sets the -:term:`LICENSE` value accordingly. +The ``devtool add`` command attempts to determine if the software you are +adding is able to be distributed under a common, open-source license. If +so, the command sets the :term:`LICENSE` value accordingly. You should double-check the value added by the command against the documentation or source files for the software you are building and, if -necessary, update that ``LICENSE`` value. +necessary, update that :term:`LICENSE` value. -The ``devtool add`` command also sets the -:term:`LIC_FILES_CHKSUM` +The ``devtool add`` command also sets the :term:`LIC_FILES_CHKSUM` value to point to all files that appear to be license-related. Realize that license statements often appear in comments at the top of source files or within the documentation. In such cases, the command does not recognize those license statements. Consequently, you might need to -amend the ``LIC_FILES_CHKSUM`` variable to point to one or more of those -comments if present. Setting ``LIC_FILES_CHKSUM`` is particularly +amend the :term:`LIC_FILES_CHKSUM` variable to point to one or more of those +comments if present. Setting :term:`LIC_FILES_CHKSUM` is particularly important for third-party software. The mechanism attempts to ensure correct licensing should you upgrade the recipe to a newer upstream version in future. Any change in licensing is detected and you receive an error prompting you to check the license text again. If the ``devtool add`` command cannot determine licensing information, -``devtool`` sets the ``LICENSE`` value to "CLOSED" and leaves the -``LIC_FILES_CHKSUM`` value unset. This behavior allows you to continue +``devtool`` sets the :term:`LICENSE` value to "CLOSED" and leaves the +:term:`LIC_FILES_CHKSUM` value unset. This behavior allows you to continue with development even though the settings are unlikely to be correct in all cases. You should check the documentation or source files for the software you are building to determine the actual license. @@ -904,12 +1202,12 @@ mind: hardcoding tools within the toolchain such as ``gcc`` and ``g++``. - The environment in which Make runs is set up with various standard - variables for compilation (e.g. ``CC``, ``CXX``, and so forth) in a + variables for compilation (e.g. :term:`CC`, :term:`CXX`, and so forth) in a similar manner to the environment set up by the SDK's environment setup script. One easy way to see these variables is to run the ``devtool build`` command on the recipe and then look in - ``oe-logs/run.do_compile``. Towards the top of this file, a list of - environment variables exists that are being set. You can take + ``oe-logs/run.do_compile``. Towards the top of this file, there is + a list of environment variables that are set. You can take advantage of these variables within the Makefile. - If the Makefile sets a default for a variable using "=", that default @@ -920,7 +1218,7 @@ mind: the command line, add the variable setting to :term:`EXTRA_OEMAKE` or :term:`PACKAGECONFIG_CONFARGS` - within the recipe. Here is an example using ``EXTRA_OEMAKE``:: + within the recipe. Here is an example using :term:`EXTRA_OEMAKE`:: EXTRA_OEMAKE += "'CC=${CC}' 'CXX=${CXX}'" @@ -944,10 +1242,9 @@ mind: Adding Native Tools ------------------- -Often, you need to build additional tools that run on the :term:`Build -Host` as opposed to -the target. You should indicate this requirement by using one of the -following methods when you run ``devtool add``: +Often, you need to build additional tools that run on the :term:`Build Host` +as opposed to the target. You should indicate this requirement by using one of +the following methods when you run ``devtool add``: - Specify the name of the recipe such that it ends with "-native". Specifying the name like this produces a recipe that only builds for @@ -971,8 +1268,7 @@ Adding Node.js Modules ---------------------- You can use the ``devtool add`` command two different ways to add -Node.js modules: 1) Through ``npm`` and, 2) from a repository or local -source. +Node.js modules: through ``npm`` or from a repository or local source. Use the following form to add Node.js modules through ``npm``:: @@ -987,7 +1283,7 @@ these behaviors ensure the reproducibility and integrity of the build. .. note:: - - You must use quotes around the URL. The ``devtool add`` does not + - You must use quotes around the URL. ``devtool add`` does not require the quotes, but the shell considers ";" as a splitter between multiple commands. Thus, without the quotes, ``devtool add`` does not receive the other parts, which results in @@ -1002,9 +1298,8 @@ repository or local source tree. To add modules this way, use $ devtool add https://github.com/diversario/node-ssdp -In this example, ``devtool`` -fetches the specified Git repository, detects the code as Node.js code, -fetches dependencies using ``npm``, and sets +In this example, ``devtool`` fetches the specified Git repository, detects the +code as Node.js code, fetches dependencies using ``npm``, and sets :term:`SRC_URI` accordingly. Working With Recipes @@ -1013,17 +1308,17 @@ Working With Recipes When building a recipe using the ``devtool build`` command, the typical build progresses as follows: -1. Fetch the source +#. Fetch the source -2. Unpack the source +#. Unpack the source -3. Configure the source +#. Configure the source -4. Compile the source +#. Compile the source -5. Install the build output +#. Install the build output -6. Package the installed output +#. Package the installed output For recipes in the workspace, fetching and unpacking is disabled as the source tree has already been prepared and is persistent. Each of these @@ -1037,10 +1332,9 @@ If you look at the contents of a recipe, you will see that the recipe does not include complete instructions for building the software. Instead, common functionality is encapsulated in classes inherited with the ``inherit`` directive. This technique leaves the recipe to describe -just the things that are specific to the software being built. A -:ref:`base <ref-classes-base>` class exists that -is implicitly inherited by all recipes and provides the functionality -that most recipes typically need. +just the things that are specific to the software being built. There is +a :ref:`ref-classes-base` class that is implicitly inherited by all recipes +and provides the functionality that most recipes typically need. The remainder of this section presents information useful when working with recipes. @@ -1066,9 +1360,9 @@ links created within the source tree: ``${``\ :term:`D`\ ``}``. - ``sysroot-destdir/``: Contains a subset of files installed within - ``do_install`` that have been put into the shared sysroot. For + :ref:`ref-tasks-install` that have been put into the shared sysroot. For more information, see the - ":ref:`dev-manual/common-tasks:sharing files between recipes`" section. + ":ref:`dev-manual/new-recipe:sharing files between recipes`" section. - ``packages-split/``: Contains subdirectories for each package produced by the recipe. For more information, see the @@ -1082,24 +1376,19 @@ Setting Configure Arguments If the software your recipe is building uses GNU autoconf, then a fixed set of arguments is passed to it to enable cross-compilation plus any -extras specified by -:term:`EXTRA_OECONF` or -:term:`PACKAGECONFIG_CONFARGS` +extras specified by :term:`EXTRA_OECONF` or :term:`PACKAGECONFIG_CONFARGS` set within the recipe. If you wish to pass additional options, add them -to ``EXTRA_OECONF`` or ``PACKAGECONFIG_CONFARGS``. Other supported build -tools have similar variables (e.g. -:term:`EXTRA_OECMAKE` for -CMake, :term:`EXTRA_OESCONS` -for Scons, and so forth). If you need to pass anything on the ``make`` -command line, you can use ``EXTRA_OEMAKE`` or the -:term:`PACKAGECONFIG_CONFARGS` -variables to do so. +to :term:`EXTRA_OECONF` or :term:`PACKAGECONFIG_CONFARGS`. Other supported build +tools have similar variables (e.g. :term:`EXTRA_OECMAKE` for CMake, +:term:`EXTRA_OESCONS` for Scons, and so forth). If you need to pass anything on +the ``make`` command line, you can use :term:`EXTRA_OEMAKE` or the +:term:`PACKAGECONFIG_CONFARGS` variables to do so. You can use the ``devtool configure-help`` command to help you set the arguments listed in the previous paragraph. The command determines the exact options being passed, and shows them to you along with any custom -arguments specified through ``EXTRA_OECONF`` or -``PACKAGECONFIG_CONFARGS``. If applicable, the command also shows you +arguments specified through :term:`EXTRA_OECONF` or +:term:`PACKAGECONFIG_CONFARGS`. If applicable, the command also shows you the output of the configure script's "--help" option as a reference. @@ -1110,15 +1399,14 @@ Recipes often need to use files provided by other recipes on the :term:`Build Host`. For example, an application linking to a common library needs access to the library itself and its associated headers. The way this access is accomplished -within the extensible SDK is through the sysroot. One sysroot exists per +within the extensible SDK is through the sysroot. There is one sysroot per "machine" for which the SDK is being built. In practical terms, this -means a sysroot exists for the target machine, and a sysroot exists for +means there is a sysroot for the target machine, and a sysroot for the build host. Recipes should never write files directly into the sysroot. Instead, files should be installed into standard locations during the -:ref:`ref-tasks-install` task within -the ``${``\ :term:`D`\ ``}`` directory. A +:ref:`ref-tasks-install` task within the ``${``\ :term:`D`\ ``}`` directory. A subset of these files automatically goes into the sysroot. The reason for this limitation is that almost all files that go into the sysroot are cataloged in manifests in order to ensure they can be removed later @@ -1134,14 +1422,12 @@ the target device, it is important to understand packaging because the contents of the image are expressed in terms of packages and not recipes. -During the :ref:`ref-tasks-package` -task, files installed during the -:ref:`ref-tasks-install` task are -split into one main package, which is almost always named the same as -the recipe, and into several other packages. This separation exists -because not all of those installed files are useful in every image. For -example, you probably do not need any of the documentation installed in -a production image. Consequently, for each recipe the documentation +During the :ref:`ref-tasks-package` task, files installed during the +:ref:`ref-tasks-install` task are split into one main package, which is almost +always named the same as the recipe, and into several other packages. This +separation exists because not all of those installed files are useful in every +image. For example, you probably do not need any of the documentation installed +in a production image. Consequently, for each recipe the documentation files are separated into a ``-doc`` package. Recipes that package software containing optional modules or plugins might undergo additional package splitting as well. @@ -1149,18 +1435,17 @@ package splitting as well. After building a recipe, you can see where files have gone by looking in the ``oe-workdir/packages-split`` directory, which contains a subdirectory for each package. Apart from some advanced cases, the -:term:`PACKAGES` and -:term:`FILES` variables controls -splitting. The ``PACKAGES`` variable lists all of the packages to be -produced, while the ``FILES`` variable specifies which files to include +:term:`PACKAGES` and :term:`FILES` variables controls +splitting. The :term:`PACKAGES` variable lists all of the packages to be +produced, while the :term:`FILES` variable specifies which files to include in each package by using an override to specify the package. For -example, ``FILES_${PN}`` specifies the files to go into the main package +example, ``FILES:${PN}`` specifies the files to go into the main package (i.e. the main package has the same name as the recipe and ``${``\ :term:`PN`\ ``}`` evaluates to the -recipe name). The order of the ``PACKAGES`` value is significant. For -each installed file, the first package whose ``FILES`` value matches the -file is the package into which the file goes. Defaults exist for both -the ``PACKAGES`` and ``FILES`` variables. Consequently, you might find +recipe name). The order of the :term:`PACKAGES` value is significant. For +each installed file, the first package whose :term:`FILES` value matches the +file is the package into which the file goes. Both the :term:`PACKAGES` and +:term:`FILES` variables have default values. Consequently, you might find you do not even need to set these variables in your recipe unless the software the recipe is building installs files into non-standard locations. @@ -1192,16 +1477,11 @@ target machine. .. note:: - The - devtool deploy-target - and - devtool undeploy-target - commands do not currently interact with any package management system - on the target device (e.g. RPM or OPKG). Consequently, you should not - intermingle - devtool deploy-target - and package manager operations on the target device. Doing so could - result in a conflicting set of files. + The ``devtool deploy-target`` and ``devtool undeploy-target`` commands do + not currently interact with any package management system on the target + device (e.g. RPM or OPKG). Consequently, you should not intermingle + ``devtool deploy-target`` and package manager operations on the target + device. Doing so could result in a conflicting set of files. Installing Additional Items Into the Extensible SDK =================================================== @@ -1215,9 +1495,29 @@ need to link to libGL but you are not sure which recipe provides libGL. You can use the following command to find out:: $ devtool search libGL mesa + A free implementation of the OpenGL API + +Once you know the recipe +(i.e. ``mesa`` in this example), you can install it. -A free implementation of the OpenGL API Once you know the recipe -(i.e. ``mesa`` in this example), you can install it:: +When using the extensible SDK directly in a Yocto build +------------------------------------------------------- + +In this scenario, the Yocto build tooling, e.g. ``bitbake`` +is directly accessible to build additional items, and it +can simply be executed directly:: + + $ bitbake curl-native + # Add newly built native items to native sysroot + $ bitbake build-sysroots -c build_native_sysroot + $ bitbake mesa + # Add newly built target items to target sysroot + $ bitbake build-sysroots -c build_target_sysroot + +When using a standalone installer for the Extensible SDK +-------------------------------------------------------- + +:: $ devtool sdk-install mesa @@ -1230,7 +1530,7 @@ source, you can add the "-s" option as follows:: It is important to remember that building the item from source takes significantly longer than installing the pre-built artifact. Also, -if no recipe exists for the item you want to add to the SDK, you must +if there is no recipe for the item you want to add to the SDK, you must instead add the item using the ``devtool add`` command. Applying Updates to an Installed Extensible SDK @@ -1244,13 +1544,13 @@ To update your installed SDK, use ``devtool`` as follows:: $ devtool sdk-update -The previous command assumes your SDK provider has set the -default update URL for you through the :term:`SDK_UPDATE_URL` -variable as described in the +The previous command assumes your SDK provider has set the default update URL +for you through the :term:`SDK_UPDATE_URL` variable as described in the ":ref:`sdk-manual/appendix-customizing:Providing Updates to the Extensible SDK After Installation`" section. If the SDK provider has not set that default URL, you need to -specify it yourself in the command as follows: $ devtool sdk-update -path_to_update_directory +specify it yourself in the command as follows:: + + $ devtool sdk-update path_to_update_directory .. note:: @@ -1267,15 +1567,15 @@ those customers need an SDK that has custom libraries. In such a case, you can produce a derivative SDK based on the currently installed SDK fairly easily by following these steps: -1. If necessary, install an extensible SDK that you want to use as a +#. If necessary, install an extensible SDK that you want to use as a base for your derivative SDK. -2. Source the environment script for the SDK. +#. Source the environment script for the SDK. -3. Add the extra libraries or other components you want by using the +#. Add the extra libraries or other components you want by using the ``devtool add`` command. -4. Run the ``devtool build-sdk`` command. +#. Run the ``devtool build-sdk`` command. The previous steps take the recipes added to the workspace and construct a new SDK installer that contains those recipes and the resulting binary |