[add] Initial commit of the meta-toki-apps layer

This layer is intended to hold the recipes for applications that are portable to different platforms supported by toki.

- Added a recipe for the minimal application
- Added a toki-app base class that shall be inherited by all application recipes

LICENSE

+BSD with Attribution License
+
+Copyright (c) 2015-2020 fortiss GmbH - Research Institute of the
+    Free State of Bavaria, Guerickestr. 25, 80805 Munich, Germany
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in
+   the documentation and/or other materials provided with the
+   distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived
+   from this software without specific prior written permission.
+
+4. Redistributions of any form whatsoever must retain the following
+   acknowledgment: 'This product includes software developed by the
+   fortiss GmbH -- Research Institute of the Free State of Bavaria,
+   Munich, Germany (https://www.fortiss.org/).'
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+SPDX-License-Identifier: BSD-3-Clause-Attribution

classes/toki-app.bbclass

+inherit cmake
+
+def generate_cmake_param_list(d, var_name, param):
+    retVal = []
+    if type(param) is dict:
+        for key in param.keys():
+            _var_name = str(var_name) + "_" + str(key)
+            retVal.extend( generate_cmake_param_list(d, _var_name, param[key]) )
+    else:
+        _var_name = str(var_name).upper()
+        retVal.append( ( str(_var_name), str(param) ) )
+
+    return retVal
+
+def app_build_params (d):
+    if d.getVar('PN'):
+        app_name = d.getVar('PN')
+        app_build_params = get_toki_app_build_params(d, app_name)
+
+        return generate_cmake_param_list(d, app_name, app_build_params)
+    return []
+
+# We do need to populate the site-file.cmake with the build parameters of each application,
+# as the it is not possible to evaluate them at an earlier stage on the Yocto build process.
+python do_populate_site_file () {
+    import os
+
+    build_params = app_build_params(d)
+
+    if len(build_params) > 0:
+        filename = "{}/site-file.cmake".format(d.getVar('WORKDIR'))
+        mode = 'w'
+
+        f = open(filename, mode)
+        for var, val in app_build_params(d):
+            f.write("set({} \"{}\" CACHE STRING \"Build parameter of the application {} automatically set according to the deployment configuration.\")".format(var, val, d.getVar('PN')) + '\n')
+        f.close()
+}
+
+# The site-file.cmake has to be generated before the CMake configuration process is started.
+addtask do_populate_site_file after generate_toolchain_file before do_configure

conf/layer.conf

+# We have a conf and classes directory, add to BBPATH
+BBPATH .= ":${LAYERDIR}"
+
+# We have recipes-* directories, add to BBFILES
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
+            ${LAYERDIR}/recipes-*/*/*.bbappend"
+
+BBFILE_COLLECTIONS += "toki-apps-layer"
+BBFILE_PATTERN_toki-apps-layer = "^${LAYERDIR}/"
+BBFILE_PRIORITY_toki-apps-layer = "6"
+LAYERVERSION_toki-apps-layer = "1"
+LAYERSERIES_COMPAT_toki-apps-layer = "thud"
+LAYERDEPENDS_toki-apps-layer = "toki-layer"

recipes-core/minimal/minimal_git.bb

+LICENSE = "CLOSED"
+LIC_FILES_CHKSUM = ""
+
+SRC_URI = "git://git.fortiss.org/toki/applications/minimal.git;protocol=https"
+
+SRCREV = "61374c9a9c21d552f96dc8124ad27ab43d3c86f1"
+PV = "0.0.1+git${SRCPV}"
+
+S = "${WORKDIR}/git"
+
+inherit toki-externalsrc
+EXTERNALSRC = "${@relative_externalsrc(d, "applications/minimal")}"
+
+BINARY_NAME = "minimal.elf"
+
+inherit toki-app
+
+FILES_${PN}-dev += "${libdir}/cmake/*"
+
+TARGET_CFLAGS += "-fpie"
+TARGET_LDFLAGS += "-pie"
+
+SYSROOT_DIRS_append = " ${bindir}"