From d0f57b4ec3bdc0074010df66cc347165a42a7c01 Mon Sep 17 00:00:00 2001
From: Andre Noll <maan@systemlinux.org>
Date: Mon, 7 Jan 2008 17:50:15 +0100
Subject: [PATCH] configure.ac: Improve alsa checks.

On non-Linux systems, do not check for alsa, and do not print the
warning message stating that alsa could not be found.

Also, skip further alsa-checks on the first failure.
---
 configure.ac | 37 +++++++++++++++++++++++++++----------
 1 file changed, 27 insertions(+), 10 deletions(-)

diff --git a/configure.ac b/configure.ac
index 8e9ca7d0..6c555538 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,8 +36,6 @@ AC_CHECK_HEADERS([arpa/inet.h ctype.h fcntl.h limits.h netdb.h netinet/in.h \
 	sys/ipc.h unistd.h utime.h stddef.h],
 	[], [AC_MSG_ERROR([$ac_header not found])])
 
-AC_CHECK_HEADER(linux/soundcard.h, [extras="$extras para_fade"],
-	[AC_MSG_WARN([linux/soundcard.h not found, cannot build para_fade])])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
@@ -427,15 +425,34 @@ have_alsa="yes"
 OLD_CPPFLAGS="$CPPFLAGS"
 OLD_LD_FLAGS="$LDFLAGS"
 OLD_LIBS="$LIBS"
-msg="=> no alsa support for para_audiod/para_write"
-AC_CHECK_HEADERS([alsa/asoundlib.h], [], [
-	AC_MSG_WARN([no alsa/asoundlib $msg])
+if test "$OSTYPE" != "Linux"; then
 	have_alsa="no"
-])
-AC_CHECK_LIB([asound], [snd_pcm_open], [], [
-	AC_MSG_WARN([no libasound $msg])
-	have_alsa="no"
-])
+fi
+msg="=> can not build para_fade, and no alsa support for para_audiod/para_write"
+if test "$have_alsa" = "yes"; then
+	AC_CHECK_HEADER(linux/soundcard.h,
+		[extras="$extras para_fade"],
+		[
+			have_alsa="no"
+			AC_MSG_WARN([no linux/soundcard.h $msg])
+		]
+	)
+fi
+
+if test "$have_alsa" = "yes"; then
+	AC_CHECK_HEADERS([alsa/asoundlib.h], [], [
+		have_alsa="no"
+		AC_MSG_WARN([no alsa/asoundlib $msg])
+	])
+fi
+
+if test "$have_alsa" = "yes"; then
+	AC_CHECK_LIB([asound], [snd_pcm_open], [], [
+		have_alsa="no"
+		AC_MSG_WARN([no libasound $msg])
+	])
+fi
+
 if test "$have_alsa" = "yes"; then
 	all_errlist_objs="$all_errlist_objs alsa_write"
 	audiod_errlist_objs="$audiod_errlist_objs alsa_write"
-- 
2.39.2