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dnl From Bruno Haible.
AC_DEFUN([AM_ICONV],
[
dnl Some systems have iconv in libc, some have it in libiconv (OSF/1 and
dnl those with the standalone portable GNU libiconv installed).
AC_ARG_WITH([libiconv],
[ --with-libiconv=DIR search for libiconv in DIR/include and DIR/lib], [
for dir in `echo "$withval" | tr : ' '`; do
if test -d $dir/include; then CPPFLAGS="$CPPFLAGS -I$dir/include"; fi
if test -d $dir/lib; then LDFLAGS="$LDFLAGS -L$dir/lib"; fi
done
])
AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
am_cv_func_iconv="no, consider installing GNU libiconv"
am_cv_lib_iconv=no
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>
#include <iconv.h>]], [[iconv_t cd = iconv_open("","");
iconv(cd,NULL,NULL,NULL,NULL);
iconv_close(cd);]])],[am_cv_func_iconv=yes],[])
if test "$am_cv_func_iconv" != yes; then
am_save_LIBS="$LIBS"
LIBS="$LIBS -liconv"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdlib.h>
#include <iconv.h>]], [[iconv_t cd = iconv_open("","");
iconv(cd,NULL,NULL,NULL,NULL);
iconv_close(cd);]])],[am_cv_lib_iconv=yes
am_cv_func_iconv=yes],[])
LIBS="$am_save_LIBS"
fi
])
if test "$am_cv_func_iconv" = yes; then
AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
AC_MSG_CHECKING([for iconv declaration])
AC_CACHE_VAL(am_cv_proto_iconv, [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
#include <iconv.h>
extern
#ifdef __cplusplus
"C"
#endif
#if defined(__STDC__) || defined(__cplusplus)
size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);
#else
size_t iconv();
#endif
]], [[]])],[am_cv_proto_iconv_arg1=""],[am_cv_proto_iconv_arg1="const"])
am_cv_proto_iconv="extern size_t iconv (iconv_t cd, $am_cv_proto_iconv_arg1 char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft);"])
am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
AC_MSG_RESULT([$]{ac_t:-
}[$]am_cv_proto_iconv)
AC_DEFINE_UNQUOTED(ICONV_CONST, $am_cv_proto_iconv_arg1,
[Define as const if the declaration of iconv() needs const.])
else
AC_MSG_FAILURE([iconv() not found. Please install libiconv and use --with-libiconv=/path/to/dir.],[1])
fi
if test "$am_cv_lib_iconv" = yes; then
LIBS="$LIBS -liconv"
fi
])