1# iconv.m4 serial AM3 (gettext-0.11)
2dnl Copyright (C) 2000-2002 Free Software Foundation, Inc.
3dnl This file is free software, distributed under the terms of the GNU
4dnl General Public License.  As a special exception to the GNU General
5dnl Public License, this file may be distributed as part of a program
6dnl that contains a configuration script generated by Autoconf, under
7dnl the same distribution terms as the rest of that program.
8
9dnl From Bruno Haible.
10
11AC_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
70AC_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>
79extern
80#ifdef __cplusplus
81"C"
82#endif
83#if defined(__STDC__) || defined(__cplusplus)
84size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
85#else
86size_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])
97