config-post.h

   1 /*
   2  * Copyright (C) 2013 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library.  If not, see
  16  * <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef __GNUC__
  20 # error "Libvirt requires GCC >= 4.8, or CLang"
  21 #endif
  22
  23 /*
  24  * Define __GNUC_PREREQ to a sane default if it isn't yet defined.
  25  * This is done here so that it's included as early as possible; gnulib relies
  26  * on this to be defined in features.h, which should be included from ctype.h.
  27  * This doesn't happen on many non-glibc systems.
  28  * When __GNUC_PREREQ is not defined, gnulib defines it to 0, which breaks things.
  29  */
  30 #ifndef __GNUC_PREREQ
  31 # define __GNUC_PREREQ(maj, min) \
  32     ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  33 #endif
  34
  35 #if !(__GNUC_PREREQ(4, 8) || defined(__clang__))
  36 # error "Libvirt requires GCC >= 4.8, or CLang"
  37 #endif