wimboot/wimboot-2.7.3/src/compiler.h

   1 #ifndef _COMPILER_H
   2 #define _COMPILER_H
   3
   4 /*
   5  * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  */
  22
  23 /**
  24  * @file
  25  *
  26  * Global compiler definitions
  27  *
  28  */
  29
  30 /* Force visibility of all symbols to "hidden", i.e. inform gcc that
  31  * all symbol references resolve strictly within our final binary.
  32  * This avoids unnecessary PLT/GOT entries on x86_64.
  33  *
  34  * This is a stronger claim than specifying "-fvisibility=hidden",
  35  * since it also affects symbols marked with "extern".
  36  */
  37 #ifndef ASSEMBLY
  38 #if __GNUC__ >= 4
  39 #pragma GCC visibility push(hidden)
  40 #endif
  41 #endif /* ASSEMBLY */
  42
  43 #endif /* _COMPILER_H */