[Qemu-devel] [patch] add configure check for working alsa

[Bernhard Fischer <rep.nop@aon.at>]

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Hi,

This patchlet adds a check to configure that makes sure that we have a
working alsa setup.

Previously, if --enable-alsa was given but the user forgot to install
the alsa libs proper, the build failed later on due to eventually
missing libs. The patch makes sure that the user can spot that alsa
support was turned off after configuration completed.

thanks,

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diff --exclude='*.diff' -rduNp ../qemu_trunk.orig/configure ./configure
--- ../qemu_trunk.orig/configure	2007-01-04 14:38:58.000000000 +0100
+++ ./configure	2007-01-04 14:48:14.000000000 +0100
@@ -509,6 +509,17 @@ fi # sdl compile test
 fi # cross compilation
 fi # -z $sdl
 
+##########################################
+# sound support libraries
+# alsa
+if test "$alsa" = "yes" ; then
+  cat > $TMPC << EOF
+#include <alsa/asoundlib.h>
+int main(void) { snd_pcm_t **handle; return snd_pcm_close(*handle); }
+EOF
+  $cc -o $TMPE $TMPC -lasound 2> /dev/null || alsa="no"
+fi # alsa
+
 # Check if tools are available to build documentation.
 if [ -x "`which texi2html`" ] && [ -x "`which pod2man`" ]; then
   build_docs="yes"