File: ao.m4

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libao 1.2.2+20180113-1
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# ao.m4
# Configure paths for libao
# Jack Moffitt <jack@icecast.org> 10-21-2000
# Shamelessly stolen from Owen Taylor and Manish Singh

dnl XIPH_PATH_AO([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
dnl Test for libao, and define AO_CFLAGS and AO_LIBS
dnl
AC_DEFUN([XIPH_PATH_AO],
[dnl 
dnl Get the cflags and libraries
dnl
AC_ARG_WITH(ao,[  --with-ao=PFX   Prefix where libao is installed (optional)], ao_prefix="$withval", ao_prefix="")
AC_ARG_WITH(ao-libraries,[  --with-ao-libraries=DIR   Directory where libao library is installed (optional)], ao_libraries="$withval", ao_libraries="")
AC_ARG_WITH(ao-includes,[  --with-ao-includes=DIR   Directory where libao header files are installed (optional)], ao_includes="$withval", ao_includes="")
AC_ARG_ENABLE(aotest, [  --disable-aotest       Do not try to compile and run a test ao program],, enable_aotest=yes)


  if test "x$ao_libraries" != "x" ; then
    AO_LIBS="-L$ao_libraries"
  elif test "x$ao_prefix" != "x"; then
    AO_LIBS="-L$ao_prefix/lib"
  elif test "x$prefix" != "xNONE"; then
    AO_LIBS="-L$prefix/lib"
  fi

  if test "x$ao_includes" != "x" ; then
    AO_CFLAGS="-I$ao_includes"
  elif test "x$ao_prefix" != "x"; then
    AO_CFLAGS="-I$ao_prefix/include"
  elif test "x$prefix" != "xNONE"; then
    AO_CFLAGS="-I$prefix/include"
  fi

  # see where dl* and friends live
  AC_CHECK_FUNCS(dlopen, [AO_DL_LIBS=""], [
    AC_CHECK_LIB(dl, dlopen, [AO_DL_LIBS="-ldl"], [
      AC_MSG_WARN([could not find dlopen() needed by libao sound drivers
      your system may not be supported.])
    ])
  ])

  AO_LIBS="$AO_LIBS -lao $AO_DL_LIBS"

  AC_MSG_CHECKING(for ao)
  no_ao=""


  if test "x$enable_aotest" = "xyes" ; then
    ac_save_CFLAGS="$CFLAGS"
    ac_save_LIBS="$LIBS"
    CFLAGS="$CFLAGS $AO_CFLAGS"
    LIBS="$LIBS $AO_LIBS"
dnl
dnl Now check if the installed ao is sufficiently new.
dnl
      rm -f conf.aotest
      AC_TRY_RUN([
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ao/ao.h>

int main ()
{
  system("touch conf.aotest");
  return 0;
}

],, no_ao=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
       CFLAGS="$ac_save_CFLAGS"
       LIBS="$ac_save_LIBS"
  fi

  if test "x$no_ao" = "x" ; then
     AC_MSG_RESULT(yes)
     ifelse([$1], , :, [$1])     
  else
     AC_MSG_RESULT(no)
     if test -f conf.aotest ; then
       :
     else
       echo "*** Could not run ao test program, checking why..."
       CFLAGS="$CFLAGS $AO_CFLAGS"
       LIBS="$LIBS $AO_LIBS"
       AC_TRY_LINK([
#include <stdio.h>
#include <ao/ao.h>
],     [ return 0; ],
       [ echo "*** The test program compiled, but did not run. This usually means"
       echo "*** that the run-time linker is not finding ao or finding the wrong"
       echo "*** version of ao. If it is not finding ao, you'll need to set your"
       echo "*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point"
       echo "*** to the installed location  Also, make sure you have run ldconfig if that"
       echo "*** is required on your system"
       echo "***"
       echo "*** If you have an old version installed, it is best to remove it, although"
       echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
       [ echo "*** The test program failed to compile or link. See the file config.log for the"
       echo "*** exact error that occured. This usually means ao was incorrectly installed"
       echo "*** or that you have moved ao since it was installed." ])
       CFLAGS="$ac_save_CFLAGS"
       LIBS="$ac_save_LIBS"
     fi
     AO_CFLAGS=""
     AO_LIBS=""
     ifelse([$2], , :, [$2])
  fi
  AC_SUBST(AO_CFLAGS)
  AC_SUBST(AO_LIBS)
  rm -f conf.aotest
])