dnl Configure Paths for Alsa

dnl Some modifications by Richard Boulton <richard-alsa@tartarus.org>

dnl Christopher Lansdown <lansdoct@cs.alfred.edu>

dnl Jaroslav Kysela <perex@suse.cz>

dnl Last modification: alsa.m4,v 1.23 2004/01/16 18:14:22 tiwai Exp

dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])

dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.

dnl enables arguments --with-alsa-prefix=

dnl                   --with-alsa-enc-prefix=

dnl                   --disable-alsatest

dnl

dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,

dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.

dnl

AC_DEFUN([AM_PATH_ALSA],

[dnl Save the original CFLAGS, LDFLAGS, and LIBS

alsa_save_CFLAGS="$CFLAGS"

alsa_save_LDFLAGS="$LDFLAGS"

alsa_save_LIBS="$LIBS"

alsa_found=yes

dnl

dnl Get the cflags and libraries for alsa

dnl

AC_ARG_WITH(alsa-prefix,

  AC_HELP_STRING([--with-alsa-prefix=PFX],

                 [prefix where Alsa library is installed(optional)]),

  [alsa_prefix="$withval"], [alsa_prefix=""])

AC_ARG_WITH(alsa-inc-prefix,

  AC_HELP_STRING([--with-alsa-inc-prefix=PFX],

                 [prefix where include libraries are (optional)]),

  [alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])

dnl FIXME: this is not yet implemented

dnl AC_ARG_ENABLE(alsatest,

dnl  AC_HELP_STRING([--disable-alsatest],

dnl                 [do not try to compile and run a test Alsa program],

dnl                 [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="$CFLAGS -I$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"

	LDFLAGS="$LDFLAGS $ALSA_LIBS"

fi

dnl add the alsa library

ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"

LIBS=`echo $LIBS | sed 's/-lm//'`

LIBS=`echo $LIBS | sed 's/-ldl//'`

LIBS=`echo $LIBS | sed 's/-lpthread//'`

LIBS=`echo $LIBS | sed 's/  //'`

LIBS="$ALSA_LIBS $LIBS"

AC_MSG_RESULT($ALSA_LIBS)

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 headers 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_LANG_SAVE

AC_LANG_C

AC_TRY_COMPILE([

#include <alsa/asoundlib.h>

], [

void main(void)

{

/* ensure backward compatibility */

#if !defined(SND_LIB_MAJOR) && defined(SOUNDLIB_VERSION_MAJOR)

#define SND_LIB_MAJOR SOUNDLIB_VERSION_MAJOR

#endif

#if !defined(SND_LIB_MINOR) && defined(SOUNDLIB_VERSION_MINOR)

#define SND_LIB_MINOR SOUNDLIB_VERSION_MINOR

#endif

#if !defined(SND_LIB_SUBMINOR) && defined(SOUNDLIB_VERSION_SUBMINOR)

#define SND_LIB_SUBMINOR SOUNDLIB_VERSION_SUBMINOR

#endif

#  if(SND_LIB_MAJOR > $alsa_min_major_version)

  exit(0);

#  else

#    if(SND_LIB_MAJOR < $alsa_min_major_version)

#       error not present

#    endif

#   if(SND_LIB_MINOR > $alsa_min_minor_version)

  exit(0);

#   else

#     if(SND_LIB_MINOR < $alsa_min_minor_version)

#          error not present

#      endif

#      if(SND_LIB_SUBMINOR < $alsa_min_micro_version)

#        error not present

#      endif

#    endif

#  endif

exit(0);

}

],

  [AC_MSG_RESULT(found.)],

  [AC_MSG_RESULT(not present.)

   ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])

   alsa_found=no]

)

AC_LANG_RESTORE

dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.

if test "x$enable_alsatest" = "xyes"; then

AC_CHECK_LIB([asound], [snd_ctl_open],,

	[ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])

	 alsa_found=no]

)

fi

if test "x$alsa_found" = "xyes" ; then

   ifelse([$2], , :, [$2])

   LIBS=`echo $LIBS | sed 's/-lasound//g'`

   LIBS=`echo $LIBS | sed 's/  //'`

   LIBS="-lasound $LIBS"

fi

if test "x$alsa_found" = "xno" ; then

   ifelse([$3], , :, [$3])

   CFLAGS="$alsa_save_CFLAGS"

   LDFLAGS="$alsa_save_LDFLAGS"

   LIBS="$alsa_save_LIBS"

   ALSA_CFLAGS=""

   ALSA_LIBS=""

fi

dnl That should be it.  Now just export out symbols:

AC_SUBST(ALSA_CFLAGS)

AC_SUBST(ALSA_LIBS)

])