Add support for Meson as build system

The Meson build system is being adopted by projects
such as GNOME, PulseAudio, GStreamer, VLC, systemd, Mesa,
Wayland, X.org, and many others. Having a meson build
upstream in tinyalsa would allow for easy use of tinyalsa
as a Meson subproject in other projects.

https://mesonbuild.com

examples/meson.build

@@ -0,0 +1,8 @@
+examples = ['pcm-readi', 'pcm-writei']
+
+foreach e : examples
+  executable(e, '@0@.c'.format(e),
+    include_directories: tinyalsa_includes,
+    link_with: tinyalsa,
+    install: false)
+endforeach

include/tinyalsa/meson.build

@@ -0,0 +1,10 @@
+tinyalsa_headers = [
+  'asoundlib.h',
+  'interval.h',
+  'limits.h',
+  'mixer.h',
+  'pcm.h',
+  'version.h'
+]
+
+install_headers(tinyalsa_headers, subdir: 'tinyalsa')

meson.build

@@ -0,0 +1,29 @@
+project ('tinyalsa', 'c', version : '1.1.1', meson_version : '>= 0.48.0')
+
+tinyalsa_includes = include_directories('.', 'include')
+
+tinyalsa = library('tinyalsa',
+  'src/mixer.c', 'src/pcm.c',
+  include_directories: tinyalsa_includes,
+  install: true)
+
+# For use as a Meson subproject
+tinyalsa_dep = declare_dependency(link_with: tinyalsa,
+  include_directories: include_directories('include'))
+
+if not get_option('docs').disabled()
+  # subdir('docs') # FIXME
+endif
+
+if not get_option('examples').disabled()
+  subdir('examples')
+endif
+
+subdir('include/tinyalsa')
+
+if not get_option('utils').disabled()
+  subdir('utils')
+endif
+
+pkg = import('pkgconfig')
+pkg.generate(tinyalsa, description: 'TinyALSA Library')

meson_options.txt

@@ -0,0 +1,6 @@
+option('docs', type: 'feature', value: 'auto', yield: true,
+  description : 'Generate documentation with Doxygen')
+option('examples', type: 'feature', value: 'auto', yield: true,
+  description : 'Build examples')
+option('utils', type: 'feature', value: 'auto', yield: true,
+  description : 'Build utility tools')

utils/meson.build

@@ -0,0 +1,9 @@
+utils = ['tinyplay', 'tinycap', 'tinymix', 'tinypcminfo']
+
+foreach util : utils
+  executable(util, '@0@.c'.format(util),
+    include_directories: tinyalsa_includes,
+    link_with: tinyalsa,
+    install: true)
+  install_man('@0@.1'.format(util))
+endforeach