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      1 # iconv.m4 serial AM4 (gettext-0.11.3)
      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_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 
     22 AC_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 
     77 AC_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>
     86 extern
     87 #ifdef __cplusplus
     88 "C"
     89 #endif
     90 #if defined(__STDC__) || defined(__cplusplus)
     91 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
     92 #else
     93 size_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