wip: Add meson build

This adds support to build with Meson. There are a few missing things
here:

 - Doesn't have the same level of warnings
 - Doesn't handle exports, this requires a move to using
   gnu symbol visibility instead of using libtool.

Makefile.am

@@ -12,7 +12,7 @@ ChangeLog:
 
 dist-hook: ChangeLog INSTALL
 
-EXTRA_DIST = autogen.sh xcb-errors.pc.in src/errors.h src/extensions.py README.md
+EXTRA_DIST = autogen.sh xcb-errors.pc.in src/errors.h src/extensions.py README.md meson.build
 
 lib_LTLIBRARIES = libxcb-errors.la
 

meson.build

@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: MIT
+# Copyright © 2024 Dylan Baker
+
+project(
+  'libxcb-errors',
+  'c',
+  version : '1.0.1',
+  meson_version : '>= 1.0',  # arbitrary
+  default_options : ['warning_level=1']
+)
+
+dep_xcb = dependency('xcb', version : '>= 1.4')
+if dep_xcb.get_variable(pkgconfig : 'xcbproto_version').version_compare('< 1.6')
+  error('libxcb was compiled against xcb-proto < 1.6, which is the minimum supported version')
+endif
+
+dep_xcb_proto = dependency('xcb-proto', version : '>= 1.6')
+
+extensions_c = custom_target(
+  'extensions.c',
+  command : [
+    find_program('python', version : '>= 3.9'),
+    '@INPUT0@',
+    '@OUTPUT@',
+    dep_xcb_proto.get_variable(pkgconfig : 'xcbincludedir'),
+  ],
+  input : ['src/extensions.py'],
+  output : ['@PLAINNAME@.c', '@PLAINNAME@.checksums'],
+  # This is marked always stale because it does globbing. There's just no way to
+  # know if the inputs have changed.
+  build_always_stale : true,
+)
+
+inc_src = include_directories('src')
+
+libxcb_errors = library(
+  'xcb-errors',
+  'src/xcb_errors.c',
+  extensions_c,
+  include_directories: inc_src,
+  dependencies : [dep_xcb],
+  version : '0.0.0',
+  install : true,
+)
+
+dep_xcb_errors = declare_dependency(
+  link_with : libxcb_errors,
+  dependencies: [dep_xcb],
+  include_directories : inc_src,
+)
+
+test(
+  'xcb-errors-test',
+  executable(
+    'xcb-errors-test',
+    'tests/test.c',
+    dependencies : dep_xcb_errors,
+  )
+)
+
+install_headers('src/xcb_errors.h', subdir : 'xcb')
+
+pkg = import('pkgconfig')
+
+pkg.generate(
+  libxcb_errors,
+  filebase: 'xcb-errors',
+  name : 'XCB errors library',
+  description : 'XCB errors utility library',
+  variables : {'xcbproto_version': dep_xcb_proto.version()},
+)