iconv: detect AIX bug

[Bruno Haible]

AIX iconv is unusable: it does not report conversion failures.

2007-03-29  Bruno Haible  <address@hidden>

        * m4/iconv.m4 (AM_ICONV_LINK): Require AC_CANONICAL_HOST. Test against
        a bug in AIX iconv().

*** m4/iconv.m4 18 Jan 2005 13:07:56 -0000      1.10
--- m4/iconv.m4 30 Mar 2007 01:45:18 -0000
***************
*** 1,5 ****
! # iconv.m4 serial AM4 (gettext-0.11.3)
! dnl Copyright (C) 2000-2002 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
--- 1,5 ----
! # iconv.m4 serial AM5 (gettext-0.16.2)
! dnl Copyright (C) 2000-2002, 2007 Free Software Foundation, Inc.
  dnl This file is free software; the Free Software Foundation
  dnl gives unlimited permission to copy and/or distribute it,
  dnl with or without modifications, as long as this notice is preserved.
***************
*** 21,26 ****
--- 21,27 ----
  [
    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_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
  
    dnl Search for libiconv and define LIBICONV, LTLIBICONV and INCICONV
    dnl accordingly.
***************
*** 33,39 ****
    am_save_CPPFLAGS="$CPPFLAGS"
    AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
  
!   AC_CACHE_CHECK(for iconv, am_cv_func_iconv, [
      am_cv_func_iconv="no, consider installing GNU libiconv"
      am_cv_lib_iconv=no
      AC_TRY_LINK([#include <stdlib.h>
--- 34,40 ----
    am_save_CPPFLAGS="$CPPFLAGS"
    AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
  
!   AC_CACHE_CHECK([for iconv], am_cv_func_iconv, [
      am_cv_func_iconv="no, consider installing GNU libiconv"
      am_cv_lib_iconv=no
      AC_TRY_LINK([#include <stdlib.h>
***************
*** 56,62 ****
      fi
    ])
    if test "$am_cv_func_iconv" = yes; then
!     AC_DEFINE(HAVE_ICONV, 1, [Define if you have the iconv() function.])
    fi
    if test "$am_cv_lib_iconv" = yes; then
      AC_MSG_CHECKING([how to link with libiconv])
--- 57,105 ----
      fi
    ])
    if test "$am_cv_func_iconv" = yes; then
!     AC_CACHE_CHECK([for working iconv], am_cv_func_iconv_works, [
!       dnl This tests against a bug in AIX 5.1: failures are not 
distinguishable
!       dnl from successul returns.
!       am_save_LIBS="$LIBS"
!       if test $am_cv_lib_iconv = yes; then
!         LIBS="$LIBS $LIBICONV"
!       fi
!       AC_TRY_RUN([
! int main ()
! {
!   static const char input[] = "\342\202\254"; /* EURO SIGN */
!   iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8");
!   if (cd_utf8_to_88591 != (iconv_t)(-1))
!     {
!       char buf[10];
!       const char *inptr = input;
!       size_t inbytesleft = strlen (input);
!       char *outptr = buf;
!       size_t outbytesleft = sizeof (buf);
!       size_t res = iconv (cd_utf8_to_88591,
!                           (char **) &inptr, &inbytesleft,
!                           &outptr, &outbytesleft);
!       return res == 0;
!     }
!   else
!     return 0;
! }], [am_cv_func_iconv_works=yes], [am_cv_func_iconv_works=no],
!         [case "$host_os" in
!            aix*) am_cv_func_iconv_works="guessing no" ;;
!            *)    am_cv_func_iconv_works="guessing yes" ;;
!          esac])
!       LIBS="$am_save_LIBS"
!     ])
!     case "$am_cv_func_iconv_works" in
!       *no) am_func_iconv=no am_cv_lib_iconv=no ;;
!       *)   am_func_iconv=yes ;;
!     esac
!   else
!     am_func_iconv=no am_cv_lib_iconv=no
!   fi
!   if test "$am_func_iconv" = yes; then
!     AC_DEFINE(HAVE_ICONV, 1,
!       [Define if you have the iconv() function and it works.])
    fi
    if test "$am_cv_lib_iconv" = yes; then
      AC_MSG_CHECKING([how to link with libiconv])