Add WANT_OSS as a compile time option (#7099)

CMakeLists.txt

@@ -71,6 +71,7 @@ INCLUDE(VersionInfo)
 INCLUDE(DetectMachine)
 
 OPTION(WANT_ALSA	"Include ALSA (Advanced Linux Sound Architecture) support" ON)
+OPTION(WANT_OSS 	"Include Open Sound System support" ON)
 OPTION(WANT_CALF	"Include CALF LADSPA plugins" ON)
 OPTION(WANT_CAPS	"Include C* Audio Plugin Suite (LADSPA plugins)" ON)
 OPTION(WANT_CARLA	"Include Carla plugin" ON)
@@ -109,9 +110,11 @@ IF(LMMS_BUILD_APPLE)
 	LINK_DIRECTORIES("${APPLE_PREFIX}/lib")
 	SET(WANT_SOUNDIO OFF)
 	SET(WANT_ALSA OFF)
+	SET(WANT_OSS OFF)
 	SET(WANT_PULSEAUDIO OFF)
 	SET(WANT_VST OFF)
 	SET(STATUS_ALSA "<not supported on this platform>")
+	SET(STATUS_OSS "<not supported on this platform>")
 	SET(STATUS_PULSEAUDIO "<not supported on this platform>")
 	SET(STATUS_APPLEMIDI "OK")
 ELSE(LMMS_BUILD_APPLE)
@@ -121,6 +124,7 @@ ENDIF(LMMS_BUILD_APPLE)
 
 IF(LMMS_BUILD_WIN32)
 	SET(WANT_ALSA OFF)
+	SET(WANT_OSS OFF)
 	SET(WANT_PULSEAUDIO OFF)
 	SET(WANT_SNDIO OFF)
 	SET(WANT_SOUNDIO OFF)
@@ -128,6 +132,7 @@ IF(LMMS_BUILD_WIN32)
 	SET(BUNDLE_QT_TRANSLATIONS ON)
 	SET(LMMS_HAVE_WINMM TRUE)
 	SET(STATUS_ALSA "<not supported on this platform>")
+	SET(STATUS_OSS "<not supported on this platform>")
 	SET(STATUS_PULSEAUDIO "<not supported on this platform>")
 	SET(STATUS_SOUNDIO "<disabled in this release>")
 	SET(STATUS_SNDIO "<not supported on this platform>")
@@ -464,13 +469,13 @@ IF(WANT_OGGVORBIS)
 ENDIF(WANT_OGGVORBIS)
 
 
-# check whether to enable OSS-support
-IF(LMMS_HAVE_SOUNDCARD_H OR LMMS_HAVE_SYS_SOUNDCARD_H)
+# check for OSS
+IF(WANT_OSS AND (LMMS_HAVE_SOUNDCARD_H OR LMMS_HAVE_SYS_SOUNDCARD_H))
 	SET(LMMS_HAVE_OSS TRUE)
 	SET(STATUS_OSS "OK")
-ELSE(LMMS_HAVE_SOUNDCARD_H OR LMMS_HAVE_SYS_SOUNDCARD_H)
+ELSEIF(WANT_OSS)
 	SET(STATUS_OSS "<not found or not supported on this platform>")
-ENDIF(LMMS_HAVE_SOUNDCARD_H OR LMMS_HAVE_SYS_SOUNDCARD_H)
+ENDIF()
 
 
 # check for ALSA