make build option --firewire an auto option

linux/wscript

@@ -7,9 +7,6 @@ def configure(conf):
     conf. check_cfg(package='libfreebob', atleast_version='1.0.0', args='--cflags --libs', mandatory=False)
     conf.env['BUILD_DRIVER_FREEBOB'] = conf.is_defined('HAVE_LIBFREEBOB')
 
-    conf. check_cfg(package='libffado', atleast_version='1.999.17', args='--cflags --libs', mandatory=False)
-    conf.env['BUILD_DRIVER_FFADO'] = conf.is_defined('HAVE_LIBFFADO')
-
     conf.define('HAVE_PPOLL', 1 )
 
     conf.check_cfg(package='gtkIOStream', atleast_version='1.4.0', args='--cflags --libs', mandatory=False)

wscript

@@ -392,7 +392,8 @@ def options(opt):
     doxygen.add_program('doxygen')
     alsa = add_auto_option(opt, 'alsa', help='Enable ALSA driver', conf_dest='BUILD_DRIVER_ALSA')
     alsa.add_package('alsa', atleast_version='1.0.18')
-    opt.add_option('--firewire', action='store_true', default=False, help='Enable FireWire driver (FFADO)')
+    firewire = add_auto_option(opt, 'firewire', help='Enable FireWire driver (FFADO)', conf_dest='BUILD_DRIVER_FFADO')
+    firewire.add_package('libffado', atleast_version='1.999.17')
     opt.add_option('--freebob', action='store_true', default=False, help='Enable FreeBob driver')
     opt.add_option('--iio', action='store_true', default=False, help='Enable IIO driver')
     opt.add_option('--portaudio', action='store_true', default=False, help='Enable Portaudio driver')
@@ -464,11 +465,8 @@ def configure(conf):
         conf.sub_config('linux')
         if Options.options.freebob and not conf.env['BUILD_DRIVER_FREEBOB']:
             conf.fatal('FreeBob driver was explicitly requested but cannot be built')
-        if Options.options.firewire and not conf.env['BUILD_DRIVER_FFADO']:
-            conf.fatal('FFADO driver was explicitly requested but cannot be built')
         if Options.options.iio and not conf.env['BUILD_DRIVER_IIO']:
             conf.fatal('IIO driver was explicitly requested but cannot be built')
-        conf.env['BUILD_DRIVER_FFADO'] = Options.options.firewire
         conf.env['BUILD_DRIVER_FREEBOB'] = Options.options.freebob
         conf.env['BUILD_DRIVER_IIO'] = Options.options.iio
     if conf.env['IS_WINDOWS']:
@@ -668,7 +666,6 @@ def configure(conf):
 
     if conf.env['IS_LINUX']:
         display_feature('Build with FireWire (FreeBob) support', conf.env['BUILD_DRIVER_FREEBOB'] == True)
-        display_feature('Build with FireWire (FFADO) support', conf.env['BUILD_DRIVER_FFADO'] == True)
         display_feature('Build with IIO support', conf.env['BUILD_DRIVER_IIO'] == True)
 
     if conf.env['IS_WINDOWS']: