meson: Improve MSVC and MinGW support and fix dependencies everywhere

Disable gio tests on Windows, fix .gitignore to not ignore
config.h.meson, and add more things to it.

Rename the library file naming and versioning to match what Autotools
outputs, e.g., libglib-2.0.so.0.5000.2 on Linux, libglib-2.0-0.dll  and
glib-2.0-0.dll on Windows with MSVC.

Several more tiny fixes, more executables built and installed, install
pkg-config and m4 files, fix building of gobject tests.

Changes to gdbus-codegen to support out-of-tree builds without
environment variables set (which you can't in Meson). We now add the
build directory to the Python module search path.

gio/gdbus-2.0/codegen/codegen.py

@@ -50,7 +50,7 @@ class CodeGenerator:
             self.ns_upper = ''
             self.ns_lower = ''
         self.interface_prefix = interface_prefix
-        self.header_guard = header_name.upper().replace('.', '_').replace('-', '_').replace('/', '_')
+        self.header_guard = header_name.upper().replace('.', '_').replace('-', '_').replace('/', '_').replace(':', '_')
 
     # ----------------------------------------------------------------------------------------------------
 

gio/gdbus-2.0/codegen/config.py.in

@@ -19,7 +19,4 @@
 #
 # Author: David Zeuthen <davidz@redhat.com>
 
-DATADIR = "@datarootdir@"
-DATADIR = DATADIR.replace(
-    "${prefix}", "@prefix@")
 VERSION = "@VERSION@"

gio/gdbus-2.0/codegen/gdbus-codegen.in

@@ -24,14 +24,18 @@ import os
 import sys
 
 srcdir = os.getenv('UNINSTALLED_GLIB_SRCDIR', None)
+filedir = os.path.dirname(__file__)
 
 if srcdir is not None:
     path = os.path.join(srcdir, 'gio', 'gdbus-2.0')
-elif os.name == 'nt':
-    # Makes gdbus-codegen 'relocatable' at runtime on Windows.
-    path = os.path.join(os.path.dirname(__file__), '..', 'share', 'glib-2.0')
+elif os.path.basename(filedir) == 'bin':
+    # Make the prefix containing gdbus-codegen 'relocatable' at runtime by
+    # adding /some/prefix/bin/../share/glib-2.0 to the python path
+    path = os.path.join(filedir, '..', 'share', 'glib-2.0')
 else:
-    path = os.path.join('@datadir@', 'glib-2.0')
+    # Assume that the modules we need are in the current directory and add the
+    # parent directory to the python path.
+    path = os.path.join(filedir, '..')
 
 sys.path.insert(0, os.path.abspath(path))
 from codegen import codegen_main

gio/gdbus-2.0/codegen/meson.build

@@ -0,0 +1,35 @@
+gdbus_codegen_files = [
+  '__init__.py',
+  'codegen.py',
+  'codegen_main.py',
+  'codegen_docbook.py',
+  'dbustypes.py',
+  'parser.py',
+  'utils.py',
+]
+
+gdbus_codegen_conf = configuration_data()
+gdbus_codegen_conf.set('VERSION', glib_version)
+gdbus_codegen_conf.set('PYTHON', python.path())
+
+# Install gdbus-codegen executable
+# FIXME: Set permissions
+gdbus_codegen = configure_file(input : 'gdbus-codegen.in',
+  output : 'gdbus-codegen',
+  install : true,
+  install_dir : 'bin', configuration : gdbus_codegen_conf)
+
+configure_file(input : 'config.py.in',
+  output : 'config.py',
+  install : true,
+  install_dir : 'share/glib-2.0/codegen', configuration : gdbus_codegen_conf)
+
+blank_conf = configuration_data()
+foreach f : gdbus_codegen_files
+  # Copy these into the builddir so that gdbus-codegen can be used uninstalled
+  # and then install it too so that it can be used after installation
+  configure_file(input : f, output : f,
+    install : true,
+    install_dir : 'share/glib-2.0/codegen',
+    configuration : blank_conf)
+endforeach