signed.m4

来自「linux下常用的网络工具的代码」· M4 代码 · 共 19 行

# signed.m4 serial 2
dnl Copyright (C) 2001-2002, 2006 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.

dnl From Bruno Haible.

AC_DEFUN([bh_C_SIGNED],
[
  AC_CACHE_CHECK([for signed], bh_cv_c_signed,
   [AC_TRY_COMPILE(, [signed char x; return !x;],
      bh_cv_c_signed=yes, bh_cv_c_signed=no)])
  if test $bh_cv_c_signed = no; then
    AC_DEFINE(signed, ,
              [Define to empty if the C compiler doesn't support this keyword.])
  fi
])