dnl @synopsis AX_ARG_WITH_CHECK(PACKAGE, HELP-STRING, RESULT-ID, TEST-SCRIPT, ACTION-IF-TRUE [, ACTION-IF-FALSE])
dnl
dnl @summary Check for an external requirement and add a switch to force it on or off.
dnl
dnl This macro is used to peform a test on the availability
dnl of a feature that needs an external requirement, giving
dnl the user the possibility to explicitely enable or
dnl disable the feature through a configure switch.
dnl
dnl If the user gave `configure' the option `--with-PACKAGE',
dnl or no option was given, run commands TEST-SCRIPT, which
dnl are supposed to store the result in RESULT-ID. If the value
dnl of RESULT-ID is `no', the test is considered failed, and
dnl ACTION-IF-FALSE is run. Any other value is considered a
dnl success, and ACTION-IF-TRUE is run. If the user gave
dnl `--without-PACKAGE', ACTION-IF-FALSE is run. If the user
dnl gave `--with-PACKAGE' and the test failed, exit with an
dnl error.
dnl
dnl Example:
dnl
dnl   AX_ARG_WITH_CHECK(libidn, AC_HELP_STRING([--with-libidn],[enable support for the idn library]), have_libidn,
dnl   [
dnl       AC_CHECK_LIB(idn, idna_to_ascii_4i, have_libidn=yes, have_libidn=no)
dnl   ],
dnl   [
dnl       LIBIDN="-lidn"
dnl       AC_DEFINE_UNQUOTED(HAVE_LIBIDN, 1, [Define if you have libidn])
dnl   ],
dnl   [
dnl       LIBIDN=
dnl   ])
dnl   AC_SUBST(LIBIDN)
dnl
dnl @author Gregorio Guidi <address@hidden>
dnl @version 2005-02-03
dnl @license AllPermissive

AC_DEFUN(AX_ARG_WITH_CHECK,
[AC_ARG_WITH([$1], [$2 @<:@default=check@:>@], , [with_]patsubst([$1], -, _)=check)
if test "[x$with_]patsubst([$1], -, _)" != xno; then
  $4
  if test "x$[$3]" != xno; then
    ifelse([$5], , :, [$5])
  else
    if test "[x$with_]patsubst([$1], -, _)" != xcheck; then
      AC_MSG_ERROR([--with-[$1] was given, but test for [$1] failed])
    fi
  fi
fi
ifelse([$6], , , [if test "[x$with_]patsubst([$1], -, _)" = xno || test "x$[$3]" = xno; then
  $6
fi])])

dnl @synopsis AX_ARG_ENABLE_CHECK(FEATURE, HELP-STRING, RESULT-ID, TEST-SCRIPT, ACTION-IF-TRUE [, ACTION-IF-FALSE])
dnl
dnl @summary Check for a feature and add a switch to force it on or off.
dnl
dnl This macro is used to peform a test on the availability
dnl of an internal feature, giving the user the possibility to
dnl explicitely enable or disable the feature through a
dnl configure switch.
dnl
dnl If the user gave `configure' the option `--enable-FEATURE',
dnl or no option was given, run commands TEST-SCRIPT, which
dnl are supposed to store the result in RESULT-ID. If the value
dnl of RESULT-ID is `no', the test is considered failed, and
dnl ACTION-IF-FALSE is run. Any other value is considered a
dnl success, and ACTION-IF-TRUE is run. If the user gave
dnl `--disable-FEATURE', ACTION-IF-FALSE is run. If the user
dnl gave `--enable-FEATURE' and the test failed, exit with an
dnl error.
dnl
dnl Example:
dnl
dnl   AX_ARG_ENABLE_CHECK(internal-malloc, AC_HELP_STRING([--enable-internal-malloc],[use own malloc implementation]), ac_cv_internal_malloc,
dnl   [
dnl       AC_CACHE_CHECK([whether own malloc implementation can be used], ac_cv_internal_malloc,
dnl       [
dnl           case $target_cpu in
dnl           i?86)
dnl               ac_cv_internal_malloc=yes;;
dnl           *)
dnl               ac_cv_internal_malloc=no;;
dnl           esac
dnl       ])
dnl   ],
dnl   [
dnl       AC_DEFINE_UNQUOTED(USE_INTERNAL_MALLOC, 1, [Define to use internal malloc implementation])
dnl   ])
dnl
dnl @author Gregorio Guidi <address@hidden>
dnl @version 2005-02-03
dnl @license AllPermissive

AC_DEFUN(AX_ARG_ENABLE_CHECK,
[AC_ARG_ENABLE([$1], [$2 @<:@default=check@:>@], , [enable_]patsubst([$1], -, _)=check)
if test "[x$enable_]patsubst([$1], -, _)" != xno; then
  $4
  if test "x$[$3]" != xno; then
    ifelse([$5], , :, [$5])
  else
    if test "[x$enable_]patsubst([$1], -, _)" != xcheck; then
      AC_MSG_ERROR([--enable-[$1] was given, but test for [$1] failed])
    fi
  fi
fi
ifelse([$6], , , [if test "[x$enable_]patsubst([$1], -, _)" = xno || test "x$[$3]" = xno; then
  $6
fi])])