iconv.m4 revision 593c365a822e505dae3aaa4d8d66eca333911624 
1# iconv.m4 serial AM4 (gettext-0.11.3)
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_LINKFLAGS_BODY],
12[
13  dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
14  AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
15  AC_REQUIRE([AC_LIB_RPATH])
16
17  dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
18  dnl accordingly.
19  AC_LIB_LINKFLAGS_BODY([iconv])
20])
21
22AC_DEFUN([AM_ICONV_LINK],
23[
24  dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
25  dnl those with the standalone portable GNU libiconv installed).
26
27  dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
28  dnl accordingly.
29  AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY])
30
31  dnl Add $INCICONV to CPPFLAGS before performing the following checks,
32  dnl because if the user has installed libiconv and not disabled its use
33  dnl via --without-libiconv-prefix, he wants to use it. The first
34  dnl AC_TRY_LINK will then fail, the second AC_TRY_LINK will succeed.
35  am_save_CPPFLAGS="$CPPFLAGS"
36  AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
37
38  AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
39    am_cv_func_iconv="no, consider installing GNU libiconv"
40    am_cv_lib_iconv=no
41    AC_TRY_LINK([#include <stdlib.h>
42#include <iconv.h>],
43      [iconv_t cd = iconv_open("","");
44       iconv(cd,NULL,NULL,NULL,NULL);
45       iconv_close(cd);],
46      am_cv_func_iconv=yes)
47    if test "$am_cv_func_iconv" != yes; then
48      am_save_LIBS="$LIBS"
49      LIBS="$LIBS $LIBICONV"
50      AC_TRY_LINK([#include <stdlib.h>
51#include <iconv.h>],
52        [iconv_t cd = iconv_open("","");
53         iconv(cd,NULL,NULL,NULL,NULL);
54         iconv_close(cd);],
55        am_cv_lib_iconv=yes
56        am_cv_func_iconv=yes)
57      LIBS="$am_save_LIBS"
58    fi
59  ])
60  if test "$am_cv_func_iconv" = yes; then
61    AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
62  fi
63  if test "$am_cv_lib_iconv" = yes; then
64    AC_MSG_CHECKING([how to link with libiconv])
65    AC_MSG_RESULT([$LIBICONV])
66  else
67    dnl If $LIBICONV didn't lead to a usable library, we don't need $INCICONV
68    dnl either.
69    CPPFLAGS="$am_save_CPPFLAGS"
70    LIBICONV=
71    LTLIBICONV=
72  fi
73  AC_SUBST(LIBICONV)
74  AC_SUBST(LTLIBICONV)
75])
76
77AC_DEFUN([AM_ICONV],
78[
79  AM_ICONV_LINK
80  if test "$am_cv_func_iconv" = yes; then
81    AC_MSG_CHECKING([for iconv declaration])
82    AC_CACHE_VAL(am_cv_proto_iconv, [
83      AC_TRY_COMPILE([
84#include <stdlib.h>
85#include <iconv.h>
86extern
87#ifdef __cplusplus
88"C"
89#endif
90#if defined(__STDC__) || defined(__cplusplus)
91size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
92#else
93size_t iconv();
94#endif
95], [], am_cv_proto_iconv_arg1="", am_cv_proto_iconv_arg1="const")
96      am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
97    am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
98    AC_MSG_RESULT([$]{ac_t:-
99         }[$]am_cv_proto_iconv)
100    AC_DEFINE_UNQUOTED(ICONV_CONST, $am_cv_proto_iconv_arg1,
101      [Define as const if the declaration of iconv() needs const.])
102  fi
103])
104