*/plugins/meson.build: define feature macros in Features.h

This makes ccache more efficient when recompiling with different
plugins.

src/playlist/PlaylistRegistry.cxx

@@ -21,6 +21,7 @@
 #include "PlaylistRegistry.hxx"
 #include "PlaylistPlugin.hxx"
 #include "SongEnumerator.hxx"
+#include "playlist/Features.h"
 #include "plugins/ExtM3uPlaylistPlugin.hxx"
 #include "plugins/M3uPlaylistPlugin.hxx"
 #include "plugins/XspfPlaylistPlugin.hxx"
@@ -31,6 +32,7 @@
 #include "plugins/FlacPlaylistPlugin.hxx"
 #include "plugins/CuePlaylistPlugin.hxx"
 #include "plugins/EmbeddedCuePlaylistPlugin.hxx"
+#include "decoder/Features.h"
 #include "input/InputStream.hxx"
 #include "util/MimeType.hxx"
 #include "util/StringView.hxx"

src/playlist/meson.build

@@ -1,3 +1,5 @@
+playlist_features = configuration_data()
+
 playlist_api = static_library(
   'playlist_api',
   'PlaylistPlugin.cxx',
@@ -23,3 +25,5 @@ playlist_glue_dep = declare_dependency(
     playlist_plugins_dep,
   ],
 )
+
+configure_file(output: 'Features.h', configuration: playlist_features)

src/playlist/plugins/meson.build

@@ -9,7 +9,7 @@ playlist_plugins_deps = [
   flac_dep,
 ]
 
-conf.set('ENABLE_CUE', get_option('cue'))
+playlist_features.set('ENABLE_CUE', get_option('cue'))
 if get_option('cue')
   playlist_plugins_sources += [
     '../cue/CueParser.cxx',
@@ -39,7 +39,7 @@ else
     error('SoundCloud requires CURL and libyajl')
   endif
 endif
-conf.set('ENABLE_SOUNDCLOUD', enable_soundcloud)
+playlist_features.set('ENABLE_SOUNDCLOUD', enable_soundcloud)
 if enable_soundcloud
   playlist_plugins_sources += 'SoundCloudPlaylistPlugin.cxx'
   playlist_plugins_deps += yajl_dep