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+# Autobuild script
+
+The Applications based on AGL framework should have a full packaging solution,
+independently of yocto workflow.
+
+Unfortunately the build part of the Applications is only in documentation or in
+yocto recipes.
+
+The Applications build with AGL framework must be automated without any yocto
+recipes.
+
+A script named **autobuild** is used to control applications build operations.
+The bbclass aglwgt.bbclass will call the **autobuild** script for all operations
+and is located at the top level of the application repository.
+
+This script could be written in one of the following languages:
+
+* Makefile
+* Bash
+* Python
+
+The script will be executed directly after a chmod() on it (this implies that the caller should make the script executable before calling it: caller could be aglwgt.bbclass, a jenkins job, a 'real' developer ...)
+An appropriate shebang is required to make the script callable directly:
+
+* '#!/usr/bin/make -f' for Makefile format,
+* '#!/usr/bin/bash' for Bash
+* etc.
+
+The calling convention is close to the one from make, in particular to pass arguments through env variables. This is also easy for bash, as a simple eval on arguments will set environment variables correctly.
+The generic call has the following format:
+
+```bash
+autobuild/agl/autobuild <command> [ARG1="value1" [ARG2="value2" ... ]]
+```
+
+autobuild can be invoked from any directory and all relative paths are
+considered to be relative to the location of autobuild.
+
+For makefile scripts, this is the usual behaviour.
+
+For bash scripts, running a 'cd $(dirname $0)' at the beginning is mandatory.
+
+At build time, the following calls must be made in the following order:
+
+```bash
+autobuild/agl/autobuild configure CONFIGURE_ARGS="..."
+```
+
+initializes the build environment (ex: if app uses cmake, the 'configure''
+step will run cmake)
+
+```bash
+autobuild/agl/autobuild build BUILD_ARGS="...."
+```
+
+builds the application (compile, link binaries, assembles javascript etc.)
+
+```bash
+autobuild/agl/autobuild package PACKAGE_ARGS="..." DEST=<path for resulting wgt
+file(s)>
+```
+
+creates the widget package(s) in the specified destination path prepared by the
+caller
+
+```bash
+autobuild/agl/autobuild package-test PACKAGE_ARGS="..." DEST=<path for resulting wgt
+file(s)>
+```
+
+creates the test widget package(s) in the specified destination path prepared by the
+caller
+
+```bash
+autobuild/agl/autobuild clean CLEAN_ARGS="..."
+```
+
+clean the built files (removes the result of autobuild build)
+
+```bash
+autobuild/agl/autobuild distclean DISTCLEAN_ARGS="..."
+```
+
+clean everything (removes the result of autobuild build + autobuild configure)
+
+## 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 _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.
+- **package-test** : build and output the test wgt as well as the normal wgt
+ package.
+- **install** : install the project in your filesystem
+
+You can specify variables that modify the behavior of compilation using
+the following variables:
+
+- **CLEAN_ARGS** : Variable used at **clean** time.
+- **DISTCLEAN_ARGS** : Variable used at **distclean** time.
+- **CONFIGURE_ARGS** : Variable used at **configure** time.
+- **BUILD_ARGS** : Variable used at **build** time.
+- **DEST** : Directory where to output ***wgt*** file (default at build root
+ directory).
+
+Variable as to be in CMake format. (ie: BUILD_ARGS="-DC_FLAGS='-g -O2'")
+
+Usage example:
+
+```bash
+./autobuild/wgt/autobuild package DEST=/tmp
+```