M4 macros for autoconf

diff --git a/utils/alsa.m4 b/utils/alsa.m4
new file mode 100644 (file)
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+++ b/utils/alsa.m4
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+dnl Configure Paths for Alsa
+dnl Christopher Lansdown (lansdoct@cs.alfred.edu)
+dnl 29/10/1998
+dnl AM_PATH_ALSA(MINIMUM-VERSION)
+dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.
+dnl enables arguments --with-alsa-prefix= --with-alsa-enc-prefix= --disable-alsatest
+dnl
+AC_DEFUN(AM_PATH_ALSA,
+[dnl
+dnl Get the clfags and libraries for alsa
+dnl
+AC_ARG_WITH(alsa-prefix,[ --with-alsa-prefix=PFX  Prefix where Alsa library is installed(optional)],
+       [alsa_prefix="$withval"], [alsa_prefix=""])
+AC_ARG_WITH(alsa-inc-prefix, [ --with-alsa-inc-prefix=PFX  Prefix where include libraries are (optional)],
+       [alsa_in_prefix="$withval"], [alsa_inc_prefix=""])
+AC_ARG_ENABLE(alsatest, [ --disable-alsatest       Do not try to compile and run a test Alsa program], [enable_alsatest=no], [enable_alsatest=yes])
+
+dnl Add any special include directories
+AC_MSG_CHECKING(for ALSA CFLAGS)
+if test "$alsa_inc_prefix" != "" ; then
+       ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
+       CFLAGS="-I$alsa_inc_prefix"
+fi
+AC_MSG_RESULT($ALSA_CFLAGS)
+
+dnl add any special lib dirs
+AC_MSG_CHECKING(for ALSA LDFLAGS)
+if test "$alsa_prefix" != "" ; then
+       ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
+       LIBS="-L$alsa_prefix"
+fi
+
+dnl add the alsa library
+ALSA_LIBS="$ALSA_LIBS -lasound"
+LIBS="$ALSA_LIBS -lasound"
+AC_MSG_RESULT($ALSA_LIBS)
+
+dnl Check for the presence of the library
+dnl if test $enable_alsatest = yes; then
+dnl   AC_MSG_CHECKING(for working libasound)
+dnl   AC_TRY_RUN([
+dnl #include <sys/asoundlib.h>
+dnl void main(void)
+dnl {
+dnl   snd_cards();
+dnl   exit(0);
+dnl }
+dnl ],
+dnl    [AC_MSG_RESULT("present")],
+dnl    [AC_MSG_RESULT("not found. ")
+dnl    AC_MSG_ERROR(Fatal error: Install alsa-lib package or use --with-alsa-prefix option...)],
+dnl    [AC_MSG_RESULT(unsopported)
+dnl     AC_MSG_ERROR(Cross-compiling isn't supported...)]
+dnl  )
+dnl fi
+
+dnl Check for a working version of libasound that is of the right version.
+min_alsa_version=ifelse([$1], ,0.1.1,$1)
+AC_MSG_CHECKING(for libasound version >= $min_alsa_version)
+no_alsa=""
+    alsa_min_major_version=`echo $min_alsa_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
+    alsa_min_minor_version=`echo $min_alsa_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
+    alsa_min_micro_version=`echo $min_alsa_version | \
+           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
+
+AC_TRY_RUN([
+#include <sys/asoundlib.h>
+void main(void)
+{
+  if(SOUNDLIB_VERSION_MAJOR >= $alsa_min_major_version)
+    if(SOUNDLIB_VERSION_MINOR >= $alsa_min_minor_version) 
+      if(SOUNDLIB_VERSION_SUBMINOR >= $alsa_min_micro_version)
+       exit(0);
+
+  exit(1);
+}
+],
+  [AC_MSG_RESULT("found.")],
+  [AC_MSG_RESULT("not present.")
+  AC_MSG_ERROR(Fatal error: Installed version of alsa-lib is too old.)],
+  [AC_MSG_RESULT("not supported")
+  AC_MSG_ERROR(Fatal error: Cross-compiling is not supported...)]
+)
+
+dnl That should be it.  Now just export out symbols:
+AC_SUBST(ALSA_CFLAGS)
+AC_SUBST(ALSA_LIBS)
+])
+