Dogcows Code - chaz/tar/blob - m4/mbstate_t.m4

   1 # serial 2
   2
   3 # From Paul Eggert.
   4
   5 # Some versions of BeOS define mbstate_t to be an incomplete type,
   6 # so you can't declare an object of that type.
   7 # Check for this incompatibility with Standard C.
   8
   9 # Include stdio.h first, because otherwise this test would fail on Linux
  10 # (at least 2.2.16) because the `_XOPEN_SOURCE 500' definition elicits
  11 # a syntax error in wchar.h due to the use of undefined __int32_t.
  12
  13 AC_DEFUN(AC_MBSTATE_T_OBJECT,
  14   [AC_CACHE_CHECK([for mbstate_t object type], ac_cv_type_mbstate_t_object,
  15     [AC_TRY_COMPILE([#include <stdio.h>
  16 #include <wchar.h>],
  17       [mbstate_t x; return sizeof x;],
  18       ac_cv_type_mbstate_t_object=yes,
  19       ac_cv_type_mbstate_t_object=no)])
  20    if test $ac_cv_type_mbstate_t_object = yes; then
  21      AC_DEFINE(HAVE_MBSTATE_T_OBJECT, 1,
  22                [Define if mbstate_t is an object type.])
  23    fi])