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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 dnl with modifications to support building with in-tree libiconv
     11 
     12 AC_DEFUN([AM_ICONV_LINKFLAGS_BODY],
     13 [
     14   dnl Prerequisites of AC_LIB_LINKFLAGS_BODY.
     15   AC_REQUIRE([AC_LIB_PREPARE_PREFIX])
     16   AC_REQUIRE([AC_LIB_RPATH])
     17 
     18   dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
     19   dnl accordingly.
     20   AC_LIB_LINKFLAGS_BODY([iconv])
     21 ])
     22 
     23 AC_DEFUN([AM_ICONV_LINK],
     24 [
     25   dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
     26   dnl those with the standalone portable GNU libiconv installed).
     27 
     28   dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
     29   dnl accordingly.
     30   AC_REQUIRE([AM_ICONV_LINKFLAGS_BODY])
     31 
     32   AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
     33     am_cv_func_iconv="no, consider installing GNU libiconv"
     34     am_cv_lib_iconv=no
     35     dnl Add $INCICONV to CPPFLAGS before performing the first check,
     36     dnl because if the user has installed libiconv and not disabled its use
     37     dnl via --without-libiconv-prefix, he wants to use it. This first
     38     dnl AC_TRY_LINK will then fail, the second AC_TRY_LINK will succeed.
     39     am_save_CPPFLAGS="$CPPFLAGS"
     40     CPPFLAGS="$CPPFLAGS $INCICONV"
     41     AC_TRY_LINK([#include <stdlib.h>
     42 #include <iconv.h>],
     43       [iconv_t cd = iconv_open("","");
     44        iconv(cd,NULL,NULL,NULL,NULL);
     45        iconv_close(cd);],
     46       am_cv_func_iconv=yes)
     47     CPPFLAGS="$am_save_CPPFLAGS"
     48 
     49     if test "$am_cv_func_iconv" != yes && test -d ../libiconv; then
     50       for _libs in .libs _libs; do
     51         am_save_CPPFLAGS="$CPPFLAGS"
     52         am_save_LIBS="$LIBS"
     53         CPPFLAGS="$CPPFLAGS -I../libiconv/include"
     54         LIBS="$LIBS ../libiconv/lib/$_libs/libiconv.a"
     55         AC_TRY_LINK([#include <stdlib.h>
     56 #include <iconv.h>],
     57           [iconv_t cd = iconv_open("","");
     58            iconv(cd,NULL,NULL,NULL,NULL);
     59            iconv_close(cd);],
     60           INCICONV="-I../libiconv/include"
     61           LIBICONV='${top_builddir}'/../libiconv/lib/$_libs/libiconv.a
     62           LTLIBICONV='${top_builddir}'/../libiconv/lib/libiconv.la
     63           am_cv_lib_iconv=yes
     64           am_cv_func_iconv=yes)
     65         CPPFLAGS="$am_save_CPPFLAGS"
     66         LIBS="$am_save_LIBS"
     67         if test "$am_cv_func_iconv" = "yes"; then
     68           break
     69         fi
     70       done
     71     fi
     72 
     73     if test "$am_cv_func_iconv" != yes; then
     74       am_save_CPPFLAGS="$CPPFLAGS"
     75       am_save_LIBS="$LIBS"
     76       CPPFLAGS="$LIBS $INCICONV"
     77       LIBS="$LIBS $LIBICONV"
     78       AC_TRY_LINK([#include <stdlib.h>
     79 #include <iconv.h>],
     80         [iconv_t cd = iconv_open("","");
     81          iconv(cd,NULL,NULL,NULL,NULL);
     82          iconv_close(cd);],
     83         am_cv_lib_iconv=yes
     84         am_cv_func_iconv=yes)
     85       CPPFLAGS="$am_save_CPPFLAGS"
     86       LIBS="$am_save_LIBS"
     87     fi
     88   ])
     89   if test "$am_cv_func_iconv" = yes; then
     90     AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
     91   fi
     92   if test "$am_cv_lib_iconv" = yes; then
     93     AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
     94     AC_MSG_CHECKING([how to link with libiconv])
     95     AC_MSG_RESULT([$LIBICONV])
     96   else
     97     LIBICONV=
     98     LTLIBICONV=
     99   fi
    100   AC_SUBST(LIBICONV)
    101   AC_SUBST(LTLIBICONV)
    102 ])
    103 
    104 AC_DEFUN([AM_ICONV],
    105 [
    106   AM_ICONV_LINK
    107   if test "$am_cv_func_iconv" = yes; then
    108     AC_MSG_CHECKING([for iconv declaration])
    109     AC_CACHE_VAL(am_cv_proto_iconv, [
    110       AC_TRY_COMPILE([
    111 #include <stdlib.h>
    112 #include <iconv.h>
    113 extern
    114 #ifdef __cplusplus
    115 "C"
    116 #endif
    117 #if defined(__STDC__) || defined(__cplusplus)
    118 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
    119 #else
    120 size_t iconv();
    121 #endif
    122 ], [], am_cv_proto_iconv_arg1="", am_cv_proto_iconv_arg1="const")
    123       am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
    124     am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
    125     AC_MSG_RESULT([$]{ac_t:-
    126          }[$]am_cv_proto_iconv)
    127     AC_DEFINE_UNQUOTED(ICONV_CONST, $am_cv_proto_iconv_arg1,
    128       [Define as const if the declaration of iconv() needs const.])
    129   fi
    130 ])
    131