audio/sdl: build as module

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20180306074053.22856-8-kraxel@redhat.com

audio/Makefile.objs

@@ -1,14 +1,11 @@
 common-obj-y = audio.o noaudio.o wavaudio.o mixeng.o
-common-obj-$(CONFIG_AUDIO_SDL) += sdlaudio.o
 common-obj-$(CONFIG_SPICE) += spiceaudio.o
 common-obj-$(CONFIG_AUDIO_COREAUDIO) += coreaudio.o
 common-obj-$(CONFIG_AUDIO_DSOUND) += dsoundaudio.o
 common-obj-$(CONFIG_AUDIO_PT_INT) += audio_pt_int.o
 common-obj-$(CONFIG_AUDIO_WIN_INT) += audio_win_int.o
 common-obj-y += wavcapture.o
 
-sdlaudio.o-cflags := $(SDL_CFLAGS)
-sdlaudio.o-libs := $(SDL_LIBS)
 coreaudio.o-libs := $(COREAUDIO_LIBS)
 dsoundaudio.o-libs := $(DSOUND_LIBS)
 
@@ -26,3 +23,9 @@ oss.mo-libs := $(OSS_LIBS)
 common-obj-$(CONFIG_AUDIO_PA) += pa.mo
 pa.mo-objs = paaudio.o
 pa.mo-libs := $(PULSE_LIBS)
+
+# sdl module
+common-obj-$(CONFIG_AUDIO_SDL) += sdl.mo
+sdl.mo-objs = sdlaudio.o
+sdl.mo-cflags := $(SDL_CFLAGS)
+sdl.mo-libs := $(SDL_LIBS)

configure

@@ -5974,7 +5974,7 @@ echo "CONFIG_AUDIO_DRIVERS=$audio_drv_list" >> $config_host_mak
 for drv in $audio_drv_list; do
     def=CONFIG_AUDIO_$(echo $drv | LC_ALL=C tr '[a-z]' '[A-Z]')
     case "$drv" in
-	alsa | oss | pa)
+	alsa | oss | pa | sdl)
 	    echo "$def=m" >> $config_host_mak ;;
 	*)
 	    echo "$def=y" >> $config_host_mak ;;