[mirror_edk2.git] / ArmVirtPkg / Include / Platform / Hidden.h

/** @file

  Copyright (c) 2018, Linaro Limited. All rights reserved.

  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef __PLATFORM_HIDDEN_H
#define __PLATFORM_HIDDEN_H

//
// Setting the GCC -fvisibility=hidden command line option is not quite the same
// as setting the pragma below: the former only affects definitions, whereas the
// pragma affects extern declarations as well. So if we want to ensure that no
// GOT indirected symbol references are emitted, we need to use the pragma, or
// GOT based cross object references could be emitted, e.g., in libraries, and
// these cannot be relaxed to ordinary symbol references at link time.
//
#pragma GCC visibility push (hidden)

#endif
Commit	Line	Data
e07092ed AB	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