add meson build system

After switching to meson, calling the `g-ir-scanner` command with the
`--warn-all` parameter in the generated `build.ninja` file will display these warnings:

```
Warning: MateMenu: symbol="DesktopEntryType": unknown namespace for identifier "DesktopEntryType"
Warning: MateMenu: symbol='desktop_entry_new': Unknown namespace for symbol 'desktop_entry_new'
Warning: MateMenu: symbol='EntryDirectory': Unknown namespace for identifier 'EntryDirectory'
```

The reason for these warnings is that we use `MateMenu` as `identifier_prefix`
and `matemenu` as `symbol_prefix`, but the symbols that report warnings do not
start with these prefixes.

1 files changed, 185 insertions, 0 deletions

diff --git a/meson.build b/meson.build
new file mode 100644
index 0000000..0cbef89
--- /dev/null
+++ b/meson.build
@@ -0,0 +1,185 @@
+project(
+  'mate-menus', 'c',
+  version: '1.27.0',
+  meson_version: '>=0.56.0',
+  license: 'GPL2',
+  default_options : [ 'warning_level=1', 'buildtype=debugoptimized', 'c_std=gnu11'],
+)
+
+package_name = meson.project_name()
+package_version = meson.project_version()
+
+# Versionning
+version_arr = package_version.split('.')
+mate_menu_version_major = version_arr[0].to_int()
+mate_menu_version_minor = version_arr[1].to_int()
+mate_menu_version_micro = version_arr[2].to_int()
+
+api_version = '2.0'
+soversion = 2
+
+if mate_menu_version_minor.is_odd()
+  mate_menu_interface_age = 0
+else
+  mate_menu_interface_age = mate_menu_version_micro
+endif
+
+# maintaining compatibility with the previous libtool versioning
+# current = minor * 100 + micro - interface
+# revision = interface
+current = mate_menu_version_minor * 100 + mate_menu_version_micro - mate_menu_interface_age
+revision = mate_menu_interface_age
+libversion = '@0@.@1@.@2@'.format(soversion, current, revision)
+# FIXME: next version should use above code for libversion
+libversion = '2.4.9'
+
+package_string = '@0@ @[email protected]'.format(package_name, package_version)
+
+config_h = configuration_data()
+config_h.set_quoted('PACKAGE', package_name, description: 'Name of package')
+config_h.set_quoted('PACKAGE_NAME', package_name, description: 'Define to the full name of this package.')
+config_h.set_quoted('PACKAGE_STRING', package_string, description: 'Define to the full name and version of this package.')
+config_h.set_quoted('PACKAGE_VERSION', package_version, description: 'Define to the version of this package.')
+config_h.set_quoted('PACKAGE_URL', 'https://mate-desktop.org', description: 'Define to the home page for this package.')
+config_h.set_quoted('GETTEXT_PACKAGE', package_name, description: 'Gettext package')
+config_h.set_quoted('VERSION', package_version, description: 'Name of package')
+
+if get_option('collection')
+  config_h.set10('WITH_COLLECTION', true)
+endif
+
+# Compiler & Project arguments
+add_project_arguments([
+  '-DHAVE_CONFIG_H',
+  '-DMATEMENU_I_KNOW_THIS_IS_UNSTABLE',
+  '-I' + meson.project_build_root(),
+  ], language: 'c')
+
+# get suported warning flags
+test_args = [
+  '-fstack-protector-strong',
+  '-Waggregate-return',
+  '-Warray-bounds',
+  '-Wcast-align',
+  '-Wchar-subscripts',
+  '-Wclobbered',
+  '-Wdeclaration-after-statement',
+  '-Wempty-body',
+  '-Wformat=2',
+  '-Wformat-nonliteral',
+  '-Wformat-security',
+  '-Werror=format-security',
+  '-Werror=format=2',
+  '-Wformat-signedness',
+  '-Wignored-qualifiers',
+  '-Wimplicit-function-declaration',
+  '-Winit-self',
+  '-Winline',
+  '-Wmissing-declarations',
+  '-Wmissing-format-attribute',
+  '-Wmissing-include-dirs',
+  '-Wmissing-noreturn',
+  '-Wmissing-parameter-type',
+  '-Wmissing-prototypes',
+  '-Wnested-externs',
+  '-Wno-discarded-qualifiers',
+  '-Wno-missing-field-initializers',
+  '-Wno-strict-aliasing',
+  '-Wno-suggest-attribute=format',
+  '-Wno-unused-parameter',
+  '-Wold-style-definition',
+  '-Woverride-init',
+  '-Wpacked',
+  '-Wpointer-arith',
+  '-Wredundant-decls',
+  '-Wreturn-type',
+  '-Wshadow',
+  '-Wsign-compare',
+  '-Wstrict-aliasing',
+  '-Wstrict-prototypes',
+  '-Wswitch-default',
+  '-Wtype-limits',
+  '-Wundef',
+  '-Wuninitialized',
+  '-Wunused-but-set-variable',
+  '-Wwrite-strings',
+  '-ansi',
+  ]
+
+cc = meson.get_compiler('c')
+
+foreach arg: test_args
+  if cc.has_multi_arguments(arg)
+    add_project_arguments(arg, language : 'c')
+  endif
+endforeach
+
+gnome = import('gnome')
+i18n = import('i18n')
+
+# Paths
+top_srcdir = include_directories('.')
+srcdir = meson.current_source_dir()
+builddir = meson.current_build_dir()
+
+prefix = get_option('prefix')
+buildtype = get_option('buildtype')
+bindir = join_paths(prefix, get_option('bindir'))
+libdir = join_paths(prefix, get_option('libdir'))
+datadir = join_paths(prefix, get_option('datadir'))
+pkgdatadir = join_paths(datadir, package_name)
+
+# Setup various paths that subdirectory meson.build files need
+package_subdir = get_option('package_subdir')
+girdir = join_paths(get_option('datadir'), package_subdir, 'gir-1.0')
+typelibdir = join_paths(get_option('libdir'), package_subdir, 'girepository-1.0')
+libdir = join_paths(get_option('libdir'), package_subdir)
+if package_subdir != ''
+  vapidir = join_paths(get_option('datadir'), package_subdir, 'vapi')
+else
+  vapidir = join_paths(get_option('datadir'), 'vala', 'vapi')
+endif
+
+if get_option('debug')
+  add_project_arguments('-DG_ENABLE_DEBUG', language : 'c')
+else
+  add_project_arguments('-DG_DISABLE_ASSERT',
+                        '-DG_DISABLE_CHECKS',
+                        language : 'c')
+endif
+
+# Dependencies
+gio_req = '>= 2.50.0'
+gio_unix_dep = dependency('gio-unix-2.0', version: gio_req)
+
+configure_file(
+  output: 'config.h',
+  configuration: config_h
+)
+
+subdir('libmenu')
+subdir('layout')
+subdir('desktop-directories')
+subdir('util')
+subdir('po')
+
+summary({
+  'prefix': prefix,
+  'exec_prefix': get_option('bindir'),
+  'libdir': libdir,
+  'bindir': bindir,
+  'sbindir': get_option('sbindir'),
+  'sysconfdir': get_option('sysconfdir'),
+  'localstatedir': get_option('localstatedir'),
+  'datadir': datadir,
+  },
+  section: 'Directories'
+)
+
+summary({
+  'Turn on debugging': get_option('debug'),
+  'Collection menu entry': get_option('collection'),
+  'Build introspection support': get_option('introspection'),
+  },
+  section: 'Configuration'
+)