AGL-repo - ##### AGL-repo is the central repo file to checkout AGL #####

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# AGL CMake template Files used to build an application, or binding, project with the AGL Application Framework. To build your AGL project using these templates, you have to install them within your project and adjust compilation option in `config.cmake`. For technical reasons, you also have to specify **cmake** target in sub CMakeLists.txt installed. Make a globbing search to find source files isn't recommended now to handle project build especially in a multiuser project because CMake will not be aware of new or removed source files. You'll find usage samples here: - [helloworld-service](https://github.com/iotbzh/helloworld-service) - [low-level-can-service](https://gerrit.automotivelinux.org/gerrit/apps/low-level-can-service) - [high-level-viwi-service](https://github.com/iotbzh/high-level-viwi-service) - [audio-binding](https://github.com/iotbzh/audio-binding) - [unicens2-binding](https://github.com/iotbzh/unicens2-binding) ## Quickstart ### Initialization To use these templates files on your project just install the reference files using **git submodule** then use `config.cmake` file to configure your project specificities : ```bash git submodule add https://gerrit.automotivelinux.org/gerrit/p/apps/app-templates.git conf.d/app-templates mkdir conf.d/cmake cp conf.d/app-templates/samples.d/config.cmake.sample conf.d/cmake/config.cmake ``` Edit the copied config.cmake file to fit your needs. Now, create your top CMakeLists.txt file which include `config.cmake` file. An example is available in **app-templates** submodule that you can copy and use: ```bash cp conf.d/app-templates/samples.d/CMakeLists.txt.sample CMakeLists.txt ``` ### Create your CMake targets For each target part of your project, you need to use ***PROJECT_TARGET_ADD*** to include this target to your project. Using it, make available the cmake variable ***TARGET_NAME*** until the next ***PROJECT_TARGET_ADD*** is invoked with a new target name. So, typical usage defining a target is: ```cmake PROJECT_TARGET_ADD(SuperExampleName) --> Adding target to your project add_executable/add_library(${TARGET_NAME}.... --> defining your target sources SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES.... --> fit target properties for macros usage ``` ### Targets PROPERTIES You should set properties on your targets that will be used to package your apps in a widget file that could be installed on an AGL system. Specify what is the type of your targets that you want to be included in the widget package with the property **LABELS**: Choose between: - **BINDING**: Shared library that be loaded by the AGL Application Framework - **BINDINGV2**: Shared library that be loaded by the AGL Application Framework This has to be accompagnied with a JSON file named like the *${OUTPUT_NAME}-apidef* of the target that describe the API with OpenAPI syntax (e.g: *mybinding-apidef*). Or you can choose the name, without the extension, by setting the *CACHE* cmake variable *OPENAPI_DEF* (***CAUTION***: setting a CACHE variable is needed, or set a normal variable with the *PARENT_SCOPE* option to make it visible for the parent scope where the target is defined) JSON file will be used to generate header file using `afb-genskel` tool. - **PLUGIN**: Shared library meant to be used as a binding plugin. Binding would load it as a plugin to extend its functionnalities. It should be named with a special extension that you choose with SUFFIX cmake target property or it'd be **.ctlso** by default. - **HTDOCS**: Root directory of a web app. This target has to build its directory and puts its files in the ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME} - **DATA**: Resources used by your application. This target has to build its directory and puts its files in the ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME} - **EXECUTABLE**: Entry point of your application executed by the AGL Application Framework - **LIBRARY**: An external 3rd party library bundled with the binding for its own purpose because platform doesn't provide it. > **TIP** you should use the prefix _afb-_ with your **BINDING* targets which > stand for **Application Framework Binding**. ```cmake SET_TARGET_PROPERTIES(${TARGET_NAME} PREFIX "afb-" LABELS "BINDING" OUTPUT_NAME "file_output_name" ) ``` > **NOTE**: You doesn't need to specify an **INSTALL** command for these > targets. This is already handle by template and will be installed in the > following path : **${CMAKE_INSTALL_PREFIX}/${PROJECT_NAME}** ## More details: Typical project architecture A typical project architecture would be : ```tree <project-root-path> │ ├── conf.d/ │ ├── autobuild/ │ │ ├── agl │ │ │ └── autobuild │ │ ├── linux │ │ │ └── autobuild │ │ └── windows │ │ └── autobuild │ ├── app-templates/ │ │ ├── README.md │ │ ├── cmake/ │ │ │ ├── export.map │ │ │ └── macros.cmake │ │ ├── samples.d/ │ │ │ ├── CMakeLists.txt.sample │ │ │ ├── config.cmake.sample │ │ │ ├── config.xml.in.sample │ │ │ └── xds-config.env.sample │ │ ├── template.d/ │ │ │ ├── autobuild/ │ │ │ │ ├── agl │ │ │ │ │ └── autobuild.in │ │ │ │ ├── linux │ │ │ │ │ └── autobuild.in │ │ │ │ └── windows │ │ │ │ └── autobuild.in │ │ │ ├── config.xml.in │ │ │ ├── deb-config.dsc.in │ │ │ ├── deb-config.install.in │ │ │ ├── debian.changelog.in │ │ │ ├── debian.compat.in │ │ │ ├── debian.rules.in │ │ │ ├── gdb-on-target.ini.in │ │ │ ├── install-wgt-on-target.sh.in │ │ │ ├── start-on-target.sh.in │ │ │ ├── rpm-config.spec.in │ │ │ └── xds-project-target.conf.in │ │ └── wgt/ │ │ ├── icon-default.png │ │ ├── icon-html5.png │ │ ├── icon-native.png │ │ ├── icon-qml.png │ │ └── icon-service.png │ ├── packaging/ │ │ ├── config.spec │ │ └── config.deb │ ├── cmake │ │ └── config.cmake │ └── wgt │ └── config.xml.in ├── <libs> ├── <target> │ └── <files> ├── <target> │ └── <file> └── <target> └── <files> ``` | # | Parent | Description | | - | -------| ----------- | | \<root-path\> | - | Path to your project. Hold master CMakeLists.txt and general files of your projects. | | conf.d | \<root-path\> | Holds needed files to build, install, debug, package an AGL app project | | app-templates | conf.d | Git submodule to app-templates AGL repository which provides CMake helpers macros library, and build scripts. config.cmake is a copy of config.cmake.sample configured for the projects. SHOULD NOT BE MODIFIED MANUALLY !| | autobuild | conf.d | Scripts generated from app-templates to build packages the same way for differents platforms.| | cmake | conf.d | Contains at least config.cmake file modified from the sample provided in app-templates submodule. | | wgt | conf.d | Contains at least config.xml.in template file modified from the sample provided in app-templates submodule for the needs of project (See config.xml.in.sample file for more details). | | packaging | conf.d | Contains output files used to build packages. | | \<libs\> | \<root-path\> | External dependencies libraries. This isn't to be used to include header file but build and link statically specifics libraries. | Library sources files. Can be a decompressed library archive file or project fork. | | \<target\> | \<root-path\> | A target to build, typically library, executable, etc. | ### Update app-templates submodule You may have some news bug fixes or features available from app-templates repository that you want. To update your submodule proceed like the following: ```bash git submodule update --remote git commit -s conf.d/app-templates ``` This will update the submodule to the HEAD of master branch repository. You could just want to update at a specified repository tag or branch or commit , here are the method to do so: ```bash cd conf.d/app-templates # Choose one of the following depending what you want git checkout <tag_name> git checkout --detach <branch_name> git checkout --detach <commit_id> # Then commit cd ../.. git commit -s conf.d/app-templates ``` ### Build a widget #### config.xml.in file To build a widget you need a _config.xml_ file describing what is your apps and how Application Framework would launch it. This repo provide a simple default file _config.xml.in_ that should work for simple application without interactions with others bindings. It is recommanded that you use the sample one which is more complete. You can find it at the same location under the name _config.xml.in.sample_ (stunning isn't it). Just copy the sample file to your _conf.d/wgt_ directory and name it _config.xml.in_, then edit it to fit your needs. > ***CAUTION*** : The default file is only meant to be use for a > simple widget app, more complicated ones which needed to export > their api, or ship several app in one widget need to use the provided > _config.xml.in.sample_ which had all new Application Framework > features explained and examples. #### Using cmake template macros To leverage all cmake templates features, you have to specify ***properties*** on your targets. Some macros will not works without specifying which is the target type. As the type is not always specified for some custom targets, like an ***HTML5*** application, macros make the difference using ***LABELS*** property. Choose between: - **BINDING**: Shared library that be loaded by the AGL Application Framework - **BINDINGV2**: Shared library that be loaded by the AGL Application Framework This has to be accompagnied with a JSON file named like the *${OUTPUT_NAME}-apidef* of the target that describe the API with OpenAPI syntax (e.g: *mybinding-apidef*). Or you can choose the name, without the extension, by setting the *CACHE* cmake variable *OPENAPI_DEF* (***CAUTION***: setting a CACHE variable is needed, or set a normal variable with the *PARENT_SCOPE* option to make it visible for the parent scope where the target is defined) JSON file will be used to generate header file using `afb-genskel` tool. - **PLUGIN**: Shared library meant to be used as a binding plugin. Binding would load it as a plugin to extend its functionnalities. It should be named with a special extension that you choose with SUFFIX cmake target property or it'd be **.ctlso** by default. - **HTDOCS**: Root directory of a web app. This target has to build its directory and puts its files in the ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME} - **DATA**: Resources used by your application. This target has to build its directory and puts its files in the ${CMAKE_CURRENT_BINARY_DIR}/${TARGET_NAME} - **EXECUTABLE**: Entry point of your application executed by the AGL Application Framework - **LIBRARY**: An external 3rd party library bundled with the binding for its own purpose because platform doesn't provide it. > **TIP** you should use the prefix _afb-_ with your **BINDING* targets which > stand for **Application Framework Binding**. Example: ```cmake SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES LABELS "HTDOCS" OUTPUT_NAME dist.prod ) ``` > **NOTE**: You doesn't need to specify an **INSTALL** command for these > targets. This is already handle by template and will be installed in the > following path : **${CMAKE_INSTALL_PREFIX}/${PROJECT_NAME}** #### Add external 3rd party library You could need to include an external library that isn't shipped in the platform. Then you have to bundle the required library in the `lib` widget directory. Templates includes some facilities to help you to do so. Classic way to do so is to declare as many CMake ExternalProject as library you need. An ExternalProject is a special CMake module that let you define how to: download, update, patch, configure, build and install an external project. It doesn't have to be a CMake project and custom step could be added for special needs using ExternalProject step. More informations on CMake [ExternalProject documentation site](https://cmake.org/cmake/help/v3.5/module/ExternalProject.html?highlight=externalproject). Example to include `mxml` library for [unicens2-binding](https://github.com/iotbzh/unicens2-binding) project: ```cmake set(MXML external-mxml) set(MXML_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/mxml) ExternalProject_Add(${MXML} GIT_REPOSITORY https://github.com/michaelrsweet/mxml.git GIT_TAG release-2.10 SOURCE_DIR ${MXML_SOURCE_DIR} CONFIGURE_COMMAND ./configure --build x86_64 --host aarch64 BUILD_COMMAND make libmxml.so.1.5 BUILD_IN_SOURCE 1 INSTALL_COMMAND "" ) PROJECT_TARGET_ADD(mxml) add_library(${TARGET_NAME} SHARED IMPORTED GLOBAL) SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES LABELS LIBRARY IMPORTED_LOCATION ${MXML_SOURCE_DIR}/libmxml.so.1 INTERFACE_INCLUDE_DIRECTORIES ${MXML_SOURCE_DIR} ) add_dependencies(${TARGET_NAME} ${MXML}) ``` Here we define an external project that drive the build of the library then we define new CMake target of type **IMPORTED**. Meaning that this target hasn't be built using CMake but is available at the location defined in the target property *IMPORTED_LOCATION*. Then target *LABELS* property is set to **LIBRARY** to ship it in the widget. Unicens project also need some header from this library, so we use the target property *INTERFACE_INCLUDE_DIRECTORIES*. Setting that when another target link to that imported target, it can access to the include directories. We bound the target to the external project using a CMake dependency at last. #### Macro reference ##### PROJECT_TARGET_ADD Typical usage would be to add the target to your project using macro `PROJECT_TARGET_ADD` with the name of your target as parameter. Example: ```cmake PROJECT_TARGET_ADD(low-can-demo) ``` > ***NOTE***: This will make available the variable `${TARGET_NAME}` > set with the specificied name. This variable will change at the next call > to this macros. ##### project_subdirs_add This macro will search in all subfolder any `CMakeLists.txt` file. If found then it will be added to your project. This could be use in an hybrid application by example where the binding lay in a sub directory. Usage : ```cmake project_subdirs_add() ``` You also can specify a globbing pattern as argument to filter which folders will be looked for. To filter all directories that begin with a number followed by a dash the anything: ```cmake project_subdirs_add("[0-9]-*") ``` ## Advanced build customization ### Including additionnals cmake files #### Machine and system custom cmake files Advanced tuning is possible using addionnals cmake files that are included automatically from some specifics locations. They are included in that order: - Project CMake files normaly located in _<project-root-path>/conf.d/app-templates/cmake/cmake.d_ - Home CMake files located in _$HOME/.config/app-templates/cmake.d_ - System CMake files located in _/etc/app-templates/cmake.d_ CMake files has to be named using the following convention: `XX-common*.cmake` or `XX-${PROJECT_NAME}*.cmake`, where `XX` are numbers, `*` file name (ie. `99-common-my_customs.cmake`). > **NOTE** You need to specify after numbers that indicate include order, to which project that file applies, if it applies to all project then use keyword `common`. So, saying that you should be aware that every normal cmake variables used at project level could be overwrited by home or system located cmake files if variables got the same name. Exceptions are cached variables set using **CACHE** keyword: Example: ```cmake set(VARIABLE_NAME 'value string random' CACHE STRING 'docstring') ``` #### OS custom cmake files This is meant to personalize the project depending on the OS your are using. At the end of config.cmake, common.cmake will include lot of cmake file to customize project build depending on your plateform. It will detect your OS deducing it from file _/etc/os-release_ now as default in almost all Linux distribution. So you can use the value of field **ID_LIKE** or **ID** if the first one doesn't exists and add a cmake file for that distribution in your _conf.d/cmake/_ directory or relatively to your _app-templates_ submodule path _app-templates/../cmake/_ Those files has to be named use the following scheme _XX-${OSRELEASE}*.cmake_ where _XX_ are numbers, ${OSRELEASE} the **ID_LIKE** or **ID** field from _/etc/os-release_ file. You can also define default OS configuration file to use as fallback is none specific OS configuration is available using the scheme _XX-default*.cmake_. Then is you need by example a module that isn't named the same in one distro only, you only has to define a specific file to handle that case then for all the other case put the configuration in the default file. ### Include customs templated scripts As well as for additionnals cmake files you can include your own templated scripts that will be passed to cmake command `configure_file`. Just create your own script to the following directories: - Home location in _$HOME/.config/app-templates/scripts_ - System location in _/etc/app-templates/scripts_ Scripts only needs to use the extension `.in` to be parsed and configured by CMake command. ## Autobuild script usage ### Generation To be integrated in the Yocto build workflow you have to generate `autobuild` scripts using _autobuild_ target. To generate those scripts proceeds: ```bash mkdir -p build cd build cmake .. && make autobuild ``` You should see _conf.d/autobuild/agl/autobuild_ file now. ### Available targets Here are the available targets available from _autobuild_ scripts: - **clean** : clean build directory from object file and targets results. - **distclean** : delete build directory - **configure** : generate project Makefile from CMakeLists.txt files. - **build** : compile all project targets. - **package** : build and output a wgt package. You can specify variables that modify the behavior of compilation using the following variables: - **CONFIGURE_ARGS** : Variable used at **configure** time. - **BUILD_ARGS** : Variable used at **build** time. - **DEST** : Directory where to output ***wgt*** file. Variable as to be in CMake format. (ie: BUILD_ARGS="-DC_FLAGS='-g -O2'") Usage example: ```bash ./conf.d/autobuild/wgt/autobuild package DEST=/tmp ```


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