make ALSA backend optional and disable by default

2 files changed, 12 insertions, 4 deletions

diff --git a/libs/backends/wscript b/libs/backends/wscript
index d405751f78..7f3dcaef28 100644
--- a/libs/backends/wscript
+++ b/libs/backends/wscript
@@ -28,8 +28,9 @@ def configure(conf):
     if Options.options.build_dummy: 
         backends += [ 'dummy' ]
 
-    if re.search ("linux", sys.platform) != None:
-        backends += [ 'alsa' ]
+    if Options.options.build_alsabackend:
+        if re.search ("linux", sys.platform) != None:
+            backends += [ 'alsa' ]
 
     for i in backends:
         sub_config_and_use(conf, i)
@@ -40,11 +41,11 @@ def build(bld):
     if sys.platform == 'darwin' or sys.platform == 'mingw' or sys.platform == 'msvc':
         backends += [ 'wavesaudio' ]
 
-    if bld.is_defined('HAVE_DUMMY'):
+    if bld.env['BUILD_DUMMYBACKEND']:
         backends += [ 'dummy' ]
 
     if re.search ("linux", sys.platform) != None:
-        if bld.is_defined('HAVE_ALSA'):
+        if bld.env['BUILD_ALSABACKEND'] and bld.is_defined('HAVE_ALSA'):
             backends += [ 'alsa' ]
 
     for i in backends:
diff --git a/wscript b/wscript
index 93368ddfa3..b29a39b6ae 100644
--- a/wscript
+++ b/wscript
@@ -410,6 +410,8 @@ def options(opt):
                     help='Architecture-specific compiler flags')
     opt.add_option('--with-dummy', action='store_true', default=False, dest='build_dummy',
                    help='Build the dummy backend (no audio/MIDI I/O, useful for profiling)')
+    opt.add_option('--with-alsabackend', action='store_true', default=False, dest='build_alsabackend',
+                   help='Build the ALSA backend')
     opt.add_option('--backtrace', action='store_true', default=True, dest='backtrace',
                     help='Compile with -rdynamic -- allow obtaining backtraces from within Ardour')
     opt.add_option('--no-carbon', action='store_true', default=False, dest='nocarbon',
@@ -740,6 +742,10 @@ def configure(conf):
         conf.env['DEBUG_DENORMAL_EXCEPTION'] = True
     if opts.build_tests:
         autowaf.check_pkg(conf, 'cppunit', uselib_store='CPPUNIT', atleast_version='1.12.0', mandatory=True)
+    if opts.build_alsabackend:
+        conf.env['BUILD_ALSABACKEND'] = True
+    if opts.build_dummy:
+        conf.env['BUILD_DUMMYBACKEND'] = True
 
     set_compiler_flags (conf, Options.options)
 
@@ -778,6 +784,7 @@ const char* const ardour_config_info = "\\n\\
     write_config_text('Use External Libraries', conf.is_defined('USE_EXTERNAL_LIBS'))
     write_config_text('Library exports hidden', conf.is_defined('EXPORT_VISIBILITY_HIDDEN'))
 
+    write_config_text('ALSA Backend',          opts.build_alsabackend)
     write_config_text('Architecture flags',    opts.arch)
     write_config_text('Aubio',                 conf.is_defined('HAVE_AUBIO'))
     write_config_text('AudioUnits',            conf.is_defined('AUDIOUNIT_SUPPORT'))