ArmVirtPkg/Include/Platform/Hidden.h

   1 /** @file
   2
   3   Copyright (c) 2018, Linaro Limited. All rights reserved.
   4
   5   This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #ifndef __PLATFORM_HIDDEN_H
  16 #define __PLATFORM_HIDDEN_H
  17
  18 //
  19 // Setting the GCC -fvisibility=hidden command line option is not quite the same
  20 // as setting the pragma below: the former only affects definitions, whereas the
  21 // pragma affects extern declarations as well. So if we want to ensure that no
  22 // GOT indirected symbol references are emitted, we need to use the pragma, or
  23 // GOT based cross object references could be emitted, e.g., in libraries, and
  24 // these cannot be relaxed to ordinary symbol references at link time.
  25 //
  26 #pragma GCC visibility push (hidden)
  27
  28 #endif