m4/iconv.m4

   1 # iconv.m4 serial AM3 (gettext-0.11)
   2 dnl Copyright (C) 2000-2002 Free Software Foundation, Inc.
   3 dnl This file is free software, distributed under the terms of the GNU
   4 dnl General Public License.  As a special exception to the GNU General
   5 dnl Public License, this file may be distributed as part of a program
   6 dnl that contains a configuration script generated by Autoconf, under
   7 dnl the same distribution terms as the rest of that program.
   8
   9 dnl From Bruno Haible.
  10
  11 AC_DEFUN([AM_ICONV_LINK],
  12 [
  13   dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
  14   dnl those with the standalone portable GNU libiconv installed).
  15
  16   dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
  17   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
  18   AC_REQUIRE([AC_LIB_RPATH])
  19
  20   dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
  21   dnl accordingly.
  22   AC_LIB_LINKFLAGS_BODY([iconv])
  23
  24   dnl Add $INCICONV to CPPFLAGS before performing the following checks,
  25   dnl because if the user has installed libiconv and not disabled its use
  26   dnl via --without-libiconv-prefix, he wants to use it. The first
  27   dnl AC_TRY_LINK will then fail, the second AC_TRY_LINK will succeed.
  28   am_save_CPPFLAGS="$CPPFLAGS"
  29   AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
  30
  31   AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
  32     am_cv_func_iconv="no, consider installing GNU libiconv"
  33     am_cv_lib_iconv=no
  34     AC_TRY_LINK([#include <stdlib.h>
  35 #include <iconv.h>],
  36       [iconv_t cd = iconv_open("","");
  37        iconv(cd,NULL,NULL,NULL,NULL);
  38        iconv_close(cd);],
  39       am_cv_func_iconv=yes)
  40     if test "$am_cv_func_iconv" != yes; then
  41       am_save_LIBS="$LIBS"
  42       LIBS="$LIBS $LIBICONV"
  43       AC_TRY_LINK([#include <stdlib.h>
  44 #include <iconv.h>],
  45         [iconv_t cd = iconv_open("","");
  46          iconv(cd,NULL,NULL,NULL,NULL);
  47          iconv_close(cd);],
  48         am_cv_lib_iconv=yes
  49         am_cv_func_iconv=yes)
  50       LIBS="$am_save_LIBS"
  51     fi
  52   ])
  53   if test "$am_cv_func_iconv" = yes; then
  54     AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
  55   fi
  56   if test "$am_cv_lib_iconv" = yes; then
  57     AC_MSG_CHECKING([how to link with libiconv])
  58     AC_MSG_RESULT([$LIBICONV])
  59   else
  60     dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV
  61     dnl either.
  62     CPPFLAGS="$am_save_CPPFLAGS"
  63     LIBICONV=
  64     LTLIBICONV=
  65   fi
  66   AC_SUBST(LIBICONV)
  67   AC_SUBST(LTLIBICONV)
  68 ])
  69
  70 AC_DEFUN([AM_ICONV],
  71 [
  72   AC_REQUIRE([AM_ICONV_LINK])
  73   if test "$am_cv_func_iconv" = yes; then
  74     AC_MSG_CHECKING([for iconv declaration])
  75     AC_CACHE_VAL(am_cv_proto_iconv, [
  76       AC_TRY_COMPILE([
  77 #include <stdlib.h>
  78 #include <iconv.h>
  79 extern
  80 #ifdef __cplusplus
  81 "C"
  82 #endif
  83 #if defined(__STDC__) || defined(__cplusplus)
  84 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
  85 #else
  86 size_t iconv();
  87 #endif
  88 ], [], am_cv_proto_iconv_arg1="", am_cv_proto_iconv_arg1="const")
  89       am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
  90     am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
  91     AC_MSG_RESULT([$]{ac_t:-
  92          }[$]am_cv_proto_iconv)
  93     AC_DEFINE_UNQUOTED(ICONV_CONST, $am_cv_proto_iconv_arg1,
  94       [Define as const if the declaration of iconv() needs const.])
  95   fi
  96 ])