/usr/include/urdf_parser/exportdecl.h is in liburdfdom-dev 0.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Software License Agreement (BSD License)
*
* Copyright (c) 2008, Willow Garage, Inc.
* All rights reserved.
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* modification, are permitted provided that the following conditions
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/* Author: Thomas Moulard */
#ifndef URDFDOM_EXPORTDECL_H
# define URDFDOM_EXPORTDECL_H
// Handle portable symbol export.
// Defining manually which symbol should be exported is required
// under Windows whether MinGW or MSVC is used.
//
// The headers then have to be able to work in two different modes:
// - dllexport when one is building the library,
// - dllimport for clients using the library.
//
// On Linux, set the visibility accordingly. If C++ symbol visibility
// is handled by the compiler, see: http://gcc.gnu.org/wiki/Visibility
# if defined _WIN32 || defined __CYGWIN__
// On Microsoft Windows, use dllimport and dllexport to tag symbols.
# define URDFDOM_DLLIMPORT __declspec(dllimport)
# define URDFDOM_DLLEXPORT __declspec(dllexport)
# define URDFDOM_DLLLOCAL
# else
// On Linux, for GCC >= 4, tag symbols using GCC extension.
# if __GNUC__ >= 4
# define URDFDOM_DLLIMPORT __attribute__ ((visibility("default")))
# define URDFDOM_DLLEXPORT __attribute__ ((visibility("default")))
# define URDFDOM_DLLLOCAL __attribute__ ((visibility("hidden")))
# else
// Otherwise (GCC < 4 or another compiler is used), export everything.
# define URDFDOM_DLLIMPORT
# define URDFDOM_DLLEXPORT
# define URDFDOM_DLLLOCAL
# endif // __GNUC__ >= 4
# endif // defined _WIN32 || defined __CYGWIN__
# ifdef URDFDOM_STATIC
// If one is using the library statically, get rid of
// extra information.
# define URDFDOM_DLLAPI
# define URDFDOM_LOCAL
# else
// Depending on whether one is building or using the
// library define DLLAPI to import or export.
# ifdef URDFDOM_EXPORTS
# define URDFDOM_DLLAPI URDFDOM_DLLEXPORT
# else
# define URDFDOM_DLLAPI URDFDOM_DLLIMPORT
# endif // URDFDOM_EXPORTS
# define URDFDOM_LOCAL URDFDOM_DLLLOCAL
# endif // URDFDOM_STATIC
#endif //! URDFDOM_EXPORTDECL_H
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