/usr/include/barry/dll.h is in libbarry-dev 0.15-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/// \file dll.h
/// Macros for handling DLL/library API visibility
///
/// Based on documentation at: http://gcc.gnu.org/wiki/Visibility
///
/*
Copyright (C) 2005-2009, Net Direct Inc. (http://www.netdirect.ca/)
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License in the COPYING file at the
root directory of this project for more details.
*/
#ifndef __BARRY_DLL_H__
#define __BARRY_DLL_H__
//
//
// Every non-templated class that is meant to be used by an application
// must be declared as:
//
// class BXEXPORT ClassName {};
//
// Every private (not protected or public) member function of an exported
// class can be declared as:
//
// private:
// BXLOCAL void HelperFunc();
//
// Every non-templated function that is meant to be used by an application
// must be declared as:
//
// BXEXPORT int GetAmount();
// BXEXPORT std::ostream& operator<< (std::ostream& os, const Obj &obj);
//
//
// Everything else will be hidden, as per the build system's configuration.
//
//
#if __BARRY_HAVE_GCCVISIBILITY__
#define BXEXPORT __attribute__ ((visibility("default")))
#define BXLOCAL __attribute__ ((visibility("hidden")))
#else
#define BXEXPORT
#define BXLOCAL
#endif
#endif
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