m4/iconv.m4

   1 #serial AM2
   2
   3 dnl From Bruno Haible.
   4
   5 AC_DEFUN([AM_ICONV],
   6 [
   7   dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
   8   dnl those with the standalone portable GNU libiconv installed).
   9
  10   AC_ARG_WITH([libiconv-prefix],
  11 [  --with-libiconv-prefix=DIR  search for libiconv in DIR/include and DIR/lib], [
  12     for dir in `echo "$withval" | tr : ' '`; do
  13       if test -d $dir/include; then CPPFLAGS="$CPPFLAGS -I$dir/include"; fi
  14       if test -d $dir/lib; then LDFLAGS="$LDFLAGS -L$dir/lib"; fi
  15     done
  16    ])
  17
  18   AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
  19     am_cv_func_iconv="no, consider installing GNU libiconv"
  20     am_cv_lib_iconv=no
  21     AC_TRY_LINK([#include <stdlib.h>
  22 #include <iconv.h>],
  23       [iconv_t cd = iconv_open("","");
  24        iconv(cd,NULL,NULL,NULL,NULL);
  25        iconv_close(cd);],
  26       am_cv_func_iconv=yes)
  27     if test "$am_cv_func_iconv" != yes; then
  28       am_save_LIBS="$LIBS"
  29       LIBS="$LIBS -liconv"
  30       AC_TRY_LINK([#include <stdlib.h>
  31 #include <iconv.h>],
  32         [iconv_t cd = iconv_open("","");
  33          iconv(cd,NULL,NULL,NULL,NULL);
  34          iconv_close(cd);],
  35         am_cv_lib_iconv=yes
  36         am_cv_func_iconv=yes)
  37       LIBS="$am_save_LIBS"
  38     fi
  39   ])
  40   if test "$am_cv_func_iconv" = yes; then
  41     AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
  42     AC_MSG_CHECKING([for iconv declaration])
  43     AC_CACHE_VAL(am_cv_proto_iconv, [
  44       AC_TRY_COMPILE([
  45 #include <stdlib.h>
  46 #include <iconv.h>
  47 extern
  48 #ifdef __cplusplus
  49 "C"
  50 #endif
  51 #if defined(__STDC__) || defined(__cplusplus)
  52 size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
  53 #else
  54 size_t iconv();
  55 #endif
  56 ], [], am_cv_proto_iconv_arg1="", am_cv_proto_iconv_arg1="const")
  57       am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
  58     am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
  59     AC_MSG_RESULT([$]{ac_t:-
  60          }[$]am_cv_proto_iconv)
  61     AC_DEFINE_UNQUOTED(ICONV_CONST, $am_cv_proto_iconv_arg1,
  62       [Define as const if the declaration of iconv() needs const.])
  63   fi
  64   LIBICONV=
  65   if test "$am_cv_lib_iconv" = yes; then
  66     LIBICONV="-liconv"
  67   fi
  68   AC_SUBST(LIBICONV)
  69 ])