PHP_ARG_WITH([iconv],
  [for iconv support],
  [AS_HELP_STRING([[--without-iconv[=DIR]]],
    [Exclude iconv support])],
  [yes])

if test "$PHP_ICONV" != "no"; then

  PHP_SETUP_ICONV(ICONV_SHARED_LIBADD, [
    iconv_avail="yes";
  ],[
    iconv_avail="no";
  ])

  if test "$iconv_avail" != "no"; then
    save_LDFLAGS="$LDFLAGS"
    save_CFLAGS="$CFLAGS"
    LDFLAGS="$ICONV_SHARED_LIBADD $LDFLAGS"
    CFLAGS="$INCLUDES $CFLAGS"

    AC_MSG_CHECKING([if iconv is glibc's])
    AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <gnu/libc-version.h>]], [[gnu_get_libc_version();]])],[
      AC_MSG_RESULT(yes)
      iconv_impl_name="glibc"
    ],[
      AC_MSG_RESULT(no)
    ])

    if test -z "$iconv_impl_name"; then
      AC_MSG_CHECKING([if using GNU libiconv])
      AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <iconv.h>
int main() {
  printf("%d", _libiconv_version);
  return 0;
}
      ]])],[
        AC_MSG_RESULT(yes)
        iconv_impl_name="gnu_libiconv"
      ],[
        AC_MSG_RESULT(no)
      ],[
        AC_MSG_RESULT([no, cross-compiling])
      ])
    fi

    if test -z "$iconv_impl_name"; then
      AC_MSG_CHECKING([if iconv is Konstantin Chuguev's])
      AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <iconv.h>]], [[iconv_ccs_init(NULL, NULL);]])],[
        AC_MSG_RESULT(yes)
        iconv_impl_name="bsd"
      ],[
        AC_MSG_RESULT(no)
      ])
    fi

    if test -z "$iconv_impl_name"; then
      AC_MSG_CHECKING([if using IBM iconv])
      AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <iconv.h>]], [[cstoccsid("");]])],[
        AC_MSG_RESULT(yes)
        iconv_impl_name="ibm"
      ],[
        AC_MSG_RESULT(no)
      ])
    fi

    case "$iconv_impl_name" in
      gnu_libiconv [)]
        AC_DEFINE([PHP_ICONV_IMPL],["libiconv"],[Which iconv implementation to use])
        AC_DEFINE([HAVE_LIBICONV],1,[Whether libiconv is used])
        ;;

      bsd [)]
        AC_DEFINE([HAVE_BSD_ICONV],1,[Konstantin Chuguev's iconv implementation])
        AC_DEFINE([PHP_ICONV_IMPL],["BSD iconv"],[Which iconv implementation to use])
        ;;

      glibc [)]
        AC_DEFINE([HAVE_GLIBC_ICONV],1,[glibc's iconv implementation])
        AC_DEFINE([PHP_ICONV_IMPL],["glibc"],[Which iconv implementation to use])
        ;;
      ibm [)]
        AC_DEFINE([HAVE_IBM_ICONV],1,[IBM iconv implementation])
        AC_DEFINE([PHP_ICONV_IMPL],["IBM iconv"],[Which iconv implementation to use])
        ;;
    esac

    AC_MSG_CHECKING([if iconv supports errno])
    AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <iconv.h>
#include <errno.h>

int main() {
  iconv_t cd;
  cd = iconv_open( "*blahblah*", "*blahblahblah*" );
  if (cd == (iconv_t)(-1)) {
    if (errno == EINVAL) {
      return 0;
  } else {
      return 1;
    }
  }
  iconv_close( cd );
  return 2;
}
    ]])],[
      AC_MSG_RESULT(yes)
    ],[
      AC_MSG_RESULT(no)
      AC_MSG_ERROR(iconv does not support errno)
    ],[
      AC_MSG_RESULT(yes, cross-compiling)
    ])

    AC_MSG_CHECKING([if iconv supports //IGNORE])
    AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <iconv.h>
#include <stdlib.h>

int main() {
  iconv_t cd = iconv_open( "UTF-8//IGNORE", "UTF-8" );
  if(cd == (iconv_t)-1) {
    return 1;
  }
  char *in_p = "\xC3\xC3\xC3\xB8";
  size_t in_left = 4, out_left = 4096;
  char *out = malloc(out_left);
  char *out_p = out;
  size_t result = iconv(cd, (char **) &in_p, &in_left, (char **) &out_p, &out_left);
  if(result == (size_t)-1) {
    return 1;
  }
  return 0;
}
   ]])],[
      AC_MSG_RESULT(yes)
      AC_DEFINE([ICONV_BROKEN_IGNORE],0,[Whether iconv supports IGNORE])
    ],[
      AC_MSG_RESULT(no)
      AC_DEFINE([ICONV_BROKEN_IGNORE],1,[Whether iconv supports IGNORE])
    ],[
      AC_MSG_RESULT(no, cross-compiling)
      AC_DEFINE([ICONV_BROKEN_IGNORE],0,[Whether iconv supports IGNORE])
    ])

    LDFLAGS="$save_LDFLAGS"
    CFLAGS="$save_CFLAGS"

    PHP_NEW_EXTENSION(iconv, iconv.c, $ext_shared,, [-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1])
    PHP_SUBST(ICONV_SHARED_LIBADD)
    PHP_INSTALL_HEADERS([ext/iconv/])
  else
    AC_MSG_ERROR(Please reinstall the iconv library.)
  fi
fi