1# iconv.m4 serial AM4 (gettext-0.11.3)
2dnl Copyright (C) 2000-2002 Free Software Foundation, Inc.
3dnl This file is free software; the Free Software Foundation
4dnl gives unlimited permission to copy and/or distribute it,
5dnl with or without modifications, as long as this notice is preserved.
6
7dnl From Bruno Haible.
8
9AC_DEFUN([AM_ICONV_LINKFLAGS_BODY],
10[
11  dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
12  AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
13  AC_REQUIRE([AC_LIB_RPATH])
14
15  dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
16  dnl accordingly.
17  AC_LIB_LINKFLAGS_BODY([iconv])
18])
19
20AC_DEFUN([AM_ICONV_LINK],
21[
22  dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
23  dnl those with the standalone portable GNU libiconv installed).
24
25  dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
26  dnl accordingly.
27  AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY])
28
29  dnl Add $INCICONV to CPPFLAGS before performing the following checks,
30  dnl because if the user has installed libiconv and not disabled its use
31  dnl via --without-libiconv-prefix, he wants to use it. The first
32  dnl AC_TRY_LINK will then fail, the second AC_TRY_LINK will succeed.
33  am_save_CPPFLAGS="$CPPFLAGS"
34  AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
35
36  AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
37    am_cv_func_iconv="no, consider installing GNU libiconv"
38    am_cv_lib_iconv=no
39    AC_TRY_LINK([#include <stdlib.h>
40#include <iconv.h>],
41      [iconv_t cd = iconv_open("","");
42       iconv(cd,NULL,NULL,NULL,NULL);
43       iconv_close(cd);],
44      am_cv_func_iconv=yes)
45    if test "$am_cv_func_iconv" != yes; then
46      am_save_LIBS="$LIBS"
47      LIBS="$LIBS $LIBICONV"
48      AC_TRY_LINK([#include <stdlib.h>
49#include <iconv.h>],
50        [iconv_t cd = iconv_open("","");
51         iconv(cd,NULL,NULL,NULL,NULL);
52         iconv_close(cd);],
53        am_cv_lib_iconv=yes
54        am_cv_func_iconv=yes)
55      LIBS="$am_save_LIBS"
56    fi
57  ])
58  if test "$am_cv_func_iconv" = yes; then
59    AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
60  fi
61  if test "$am_cv_lib_iconv" = yes; then
62    AC_MSG_CHECKING([how to link with libiconv])
63    AC_MSG_RESULT([$LIBICONV])
64  else
65    dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV
66    dnl either.
67    CPPFLAGS="$am_save_CPPFLAGS"
68    LIBICONV=
69    LTLIBICONV=
70  fi
71  AC_SUBST(LIBICONV)
72  AC_SUBST(LTLIBICONV)
73])
74
75AC_DEFUN([AM_ICONV],
76[
77  AM_ICONV_LINK
78  if test "$am_cv_func_iconv" = yes; then
79    AC_MSG_CHECKING([for iconv declaration])
80    AC_CACHE_VAL(am_cv_proto_iconv, [
81      AC_TRY_COMPILE([
82#include <stdlib.h>
83#include <iconv.h>
84extern
85#ifdef __cplusplus
86"C"
87#endif
88#if defined(__STDC__) || defined(__cplusplus)
89size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
90#else
91size_t iconv();
92#endif
93], [], am_cv_proto_iconv_arg1="", am_cv_proto_iconv_arg1="const")
94      am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
95    am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
96    AC_MSG_RESULT([$]{ac_t:-
97         }[$]am_cv_proto_iconv)
98    AC_DEFINE_UNQUOTED(ICONV_CONST, $am_cv_proto_iconv_arg1,
99      [Define as const if the declaration of iconv() needs const.])
100  fi
101])
102