code.delx.au - gnu-emacs/blob - m4/ssize_t.m4

   1 # ssize_t.m4 serial 5 (gettext-0.18.2)
   2 dnl Copyright (C) 2001-2003, 2006, 2010-2015 Free Software Foundation,
   3 dnl Inc.
   4 dnl This file is free software; the Free Software Foundation
   5 dnl gives unlimited permission to copy and/or distribute it,
   6 dnl with or without modifications, as long as this notice is preserved.
   7
   8 dnl From Bruno Haible.
   9 dnl Test whether ssize_t is defined.
  10
  11 AC_DEFUN([gt_TYPE_SSIZE_T],
  12 [
  13   AC_CACHE_CHECK([for ssize_t], [gt_cv_ssize_t],
  14     [AC_COMPILE_IFELSE(
  15        [AC_LANG_PROGRAM(
  16           [[#include <sys/types.h>]],
  17           [[int x = sizeof (ssize_t *) + sizeof (ssize_t);
  18             return !x;]])],
  19        [gt_cv_ssize_t=yes], [gt_cv_ssize_t=no])])
  20   if test $gt_cv_ssize_t = no; then
  21     AC_DEFINE([ssize_t], [int],
  22               [Define as a signed type of the same size as size_t.])
  23   fi
  24 ])