#14379: Make alsa an optional feature at compile time

daemon/configure.ac

@@ -102,7 +102,16 @@ PKG_CHECK_MODULES(LIBCRYPTO, libcrypto >= ${LIBCRYPTO_MIN_VERSION}, HAVE_LIBCRYP
 
 dnl Check for alsa development package - name: libasound2-dev
 ALSA_MIN_VERSION=1.0
-PKG_CHECK_MODULES(ALSA, alsa >= ${ALSA_MIN_VERSION},, AC_MSG_ERROR([Missing alsa development package: libasound2-dev or alsa-lib-devel]))
+AC_ARG_WITH([alsa],
+	[ AS_HELP_STRING([--without-alsa], [disable support for alsa]) ],
+	[],
+	[with_alsa=yes])
+AS_IF([test "x$with_alsa" = "xyes"], [
+	PKG_CHECK_MODULES(ALSA, alsa >= ${ALSA_MIN_VERSION},, AC_MSG_ERROR([Missing alsa development package: libasound2-dev or alsa-lib-devel]))
+	]);
+
+AC_DEFINE_UNQUOTED([HAVE_ALSA], `if test "x$with_alsa" = "xyes"; then echo 1; else echo 0; fi`, [Define if you have alsa])
+AM_CONDITIONAL(BUILD_ALSA, test "x$with_alsa" = "xyes")
 
 dnl Check for pulseaudio development package - name: libpulse-dev
 LIBPULSE_MIN_VERSION=0.9.15
@@ -115,7 +124,7 @@ AS_IF([test "x$with_pulse" = "xyes"], [
       ]);
 
 AC_DEFINE_UNQUOTED([HAVE_PULSE], `if test "x$with_pulse" = "xyes"; then echo 1; else echo 0; fi`, [Define if you have pulseaudio])
-AM_CONDITIONAL(BUILD_PULSE, test "x$with_pulse" = "xyes" )
+AM_CONDITIONAL(BUILD_PULSE, test "x$with_pulse" = "xyes")
 
 dnl Check for the samplerate development package - name: libsamplerate0-dev
 LIBSAMPLERATE_MIN_VERSION=0.1.2

daemon/src/audio/Makefile.am

@@ -2,7 +2,11 @@ include $(top_srcdir)/globals.mak
 
 noinst_LTLIBRARIES = libaudio.la
 
-SUBDIRS = codecs audiortp sound alsa
+SUBDIRS = codecs audiortp sound
+
+if BUILD_ALSA
+SUBDIRS += alsa
+endif
 
 if BUILD_PULSE
 SUBDIRS += pulseaudio
@@ -50,3 +54,7 @@ libaudio_la_LIBADD = \
 if BUILD_PULSE
 libaudio_la_LIBADD += ./pulseaudio/libpulselayer.la
 endif
+
+if BUILD_ALSA
+libaudio_la_LIBADD += ./alsaaudio/libaudiolayer.la
+endif

daemon/src/audio/alsa/Makefile.am

 include $(top_srcdir)/globals.mak
 
+if BUILD_ALSA
+
 noinst_LTLIBRARIES = libalsalayer.la
 
 libalsalayer_la_SOURCES = alsalayer.cpp
 
 noinst_HEADERS = alsalayer.h
 
+endif