src/m4/optional-fmt.m4

dnl SoX autoconf macro: optional format     (c) 2009 robs@users.sourceforge.net
dnl
dnl This program is free software; you can redistribute it and/or modify it
dnl under the terms of the GNU General Public License as published by the
dnl Free Software Foundation; either version 2 of the License, or (at your
dnl option) any later version.
dnl
dnl This program is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
dnl Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License along
dnl with this program; if not, write to the Free Software Foundation, Inc.,
dnl 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

dnl $1 package name                  e.g. flac 
dnl $2 package name in conditionals  e.g. FLAC 
dnl $3 using check

AC_DEFUN([AC_OPTIONAL_FORMAT],
  [AC_ARG_WITH($1, AC_HELP_STRING([--with-$1=dyn], [load $1 dynamically]))
  using_$1=$with_$1
  if test "_$with_$1" = _dyn; then
    if test $using_libltdl != yes; then
      AC_MSG_FAILURE([not using libltdl; cannot load $1 dynamically])
    fi
  elif test "_$with_$1" = _; then
    using_$1=$opt_default
  elif test "_$with_$1" != _yes -a "_$with_$1" != _no; then
    AC_MSG_FAILURE([invalid selection --with-$1=$with_$1])
  fi
  if test _$with_$1 != _no; then
    $3
    if test _$with_$1 != _ -a $using_$1 = no; then
      AC_MSG_FAILURE([cannot find $1])
    fi
  fi
  if test "$using_$1" != no; then
    AC_DEFINE(HAVE_$2, 1, [Define to 1 if you have $1.])
    if test "$using_$1" = yes; then
      AC_DEFINE(STATIC_$2, 1, [Define to 1 if you have static $1.])
    fi
  fi
  AM_CONDITIONAL(HAVE_$2, test $using_$1 != no)
  AM_CONDITIONAL(STATIC_$2, test $using_$1 = yes)
  AC_SUBST($2_CFLAGS)
  AC_SUBST($2_LIBS)]
)