gdbus: Add glib DBus bindings

Adds support for generating dbus bindings using the newer gdbus-codegen
tool that is designed to replace the deprecated dbus-binding-tool tool

demos/gdbus/main.c

@@ -0,0 +1,3 @@
+int main() {
+	return 0;
+}

demos/gdbus/test.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<node name="/org/freedesktop/DBus/Properties">
+ <interface name="org.freedesktop.DBus.Properties">
+   <method name="Set">
+     <arg type="s" name="interface_name"/>
+     <arg type="s" name="property_name"/>
+     <arg type="v" name="value"/>
+   </method>
+ </interface>
+</node>

demos/gdbus/wscript

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+#! /usr/bin/env python
+# encoding: utf-8
+# Copyright Garmin International or its subsidiaries, 2018
+
+VERSION = '1.0'
+
+def options(opt):
+	opt.load('compiler_c')
+
+def configure(conf):
+	conf.load('compiler_c gdbus')
+        conf.check_cfg(package='gio-2.0', args='--cflags --libs')
+        conf.check_cfg(package='gio-unix-2.0', args='--cflags --libs')
+        conf.check_cfg(package='glib-2.0', args='--cflags --libs')
+
+def build(bld):
+	tg = bld.program(
+		includes = '.',
+		source = bld.path.ant_glob('*.c'),
+		target = 'gnome-hello',
+                use = 'GIO-2.0 GIO-UNIX-2.0 GLIB-2.0')
+
+	tg.add_gdbus_file('test.xml', 'test_prefix', 'glib_server')
+

waflib/Tools/gdbus.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python
+# encoding: utf-8
+# Copyright Garmin International or its subsidiaries, 2018
+#
+# Heavily based on dbus.py
+
+"""
+Compiles dbus files with **gdbus-codegen**
+Typical usage::
+    def options(opt):
+        opt.load('compiler_c gdbus')
+    def configure(conf):
+        conf.load('compiler_c gdbus')
+    def build(bld):
+        tg = bld.program(
+            includes = '.',
+            source = bld.path.ant_glob('*.c'),
+            target = 'gnome-hello')
+        tg.add_gdbus_file('test.xml', 'com.example.example.', 'Example')
+"""
+
+import os
+from waflib import Task, Errors, Utils
+from waflib.TaskGen import taskgen_method, before_method
+
+@taskgen_method
+def add_gdbus_file(self, filename, prefix, namespace, export=False):
+    """
+    Adds a dbus file to the list of dbus files to process. Store them in the attribute *dbus_lst*.
+    :param filename: xml file to compile
+    :type filename: string
+    :param prefix: interface prefix (--interface-prefix=prefix)
+    :type prefix: string
+    :param mode: C namespace (--c-namespace=namespace)
+    :type mode: string
+    :param export: Export Headers?
+    :type export: boolean
+    """
+    if not hasattr(self, 'gdbus_lst'):
+        self.gdbus_lst = []
+    if not 'process_gdbus' in self.meths:
+        self.meths.append('process_gdbus')
+    self.gdbus_lst.append([filename, prefix, namespace, export])
+
+@before_method('apply_core')
+@before_method('process_source')
+def process_gdbus(self):
+    """
+    Processes the dbus files stored in the attribute *gdbus_lst* to create :py:class:`gdbus_binding_tool` instances.
+    """
+    output_node = self.path.get_bld().make_node(['gdbus', self.get_name()])
+    sources = []
+
+    for filename, prefix, namespace, export in getattr(self, 'gdbus_lst', []):
+        node = self.path.find_resource(filename)
+        if not node:
+            raise Errors.WafError('file not found ' + filename)
+        c_file = output_node.find_or_declare(node.change_ext('.c').name)
+        h_file = output_node.find_or_declare(node.change_ext('.h').name)
+        tsk = self.create_task('gdbus_binding_tool', node, [c_file, h_file])
+        tsk.cwd = output_node.abspath()
+
+        tsk.env.GDBUS_CODEGEN_INTERFACE_PREFIX = prefix
+        tsk.env.GDBUS_CODEGEN_NAMESPACE = namespace
+        tsk.env.GDBUS_CODEGEN_OUTPUT = node.change_ext('').name
+        sources.append(c_file)
+
+    if sources:
+        output_node.mkdir()
+        self.source = Utils.to_list(self.source) + sources
+        self.includes = [output_node] + self.to_incnodes(getattr(self, 'includes', []))
+        if export:
+            self.export_includes = [output_node] + self.to_incnodes(getattr(self, 'export_includes', []))
+
+class gdbus_binding_tool(Task.Task):
+    """
+    Compiles a dbus file
+    """
+    color   = 'BLUE'
+    ext_out = ['.h', '.c']
+    run_str = '${GDBUS_CODEGEN} --interface-prefix ${GDBUS_CODEGEN_INTERFACE_PREFIX} --generate-c-code ${GDBUS_CODEGEN_OUTPUT} --c-namespace ${GDBUS_CODEGEN_NAMESPACE} --c-generate-object-manager ${SRC[0].abspath()}'
+    shell = True
+
+def configure(conf):
+    """
+    Detects the program gdbus-codegen and sets ``conf.env.GDBUS_CODEGEN``
+    """
+    conf.find_program('gdbus-codegen', var='GDBUS_CODEGEN')
+