/usr/include/simgear/compiler.h is in libsimgear-dev 1:2018.1.1+dfsg-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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* compiler.h -- C++ Compiler Portability Macros
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $Id$
*
**************************************************************************/
/** \file compiler.h
* A set of defines to encapsulate compiler and platform differences.
* Please refer to the source code for full documentation on this file.
*
* This file is useful to set compiler-specific options in every file - for
* example, disabling warnings.
*
*/
#ifndef _SG_COMPILER_H
#define _SG_COMPILER_H
/*
* Helper macro SG_STRINGIZE:
* Converts the parameter X to a string after macro replacement
* on X has been performed.
*/
#define SG_STRINGIZE(X) SG_DO_STRINGIZE(X)
#define SG_DO_STRINGIZE(X) #X
#ifdef __GNUC__
# define SG_GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
# define SG_COMPILER_STR "GNU C++ version " SG_STRINGIZE(__GNUC__) "." SG_STRINGIZE(__GNUC_MINOR__)
#endif // __GNUC__
//
// Microsoft compilers.
//
#ifdef _MSC_VER
# define strcasecmp stricmp
# if _MSC_VER >= 1200 // msvc++ 6.0 up to MSVC2013
# if _MSC_VER < 1900
# define bcopy(from, to, n) memcpy(to, from, n)
# define snprintf _snprintf
# define strdup _strdup
# define copysign _copysign
# endif
# pragma warning(disable: 4786) // identifier was truncated to '255' characters
# pragma warning(disable: 4244) // conversion from double to float
# pragma warning(disable: 4305) // truncation from larger type to smaller
# pragma warning(disable: 4267) // conversion from size_t to int / 32-bit type
# pragma warning(disable: 4996) // don't require _ prefix for standard library functions
# pragma warning(disable: 4800) // don't warn about int -> bool performance
# else
# error What version of MSVC++ is this?
# endif
# define SG_COMPILER_STR "Microsoft Visual C++ version " SG_STRINGIZE(_MSC_VER)
#endif // _MSC_VER
//
// Intel C++ Compiler
//
#if defined(__ICC) || defined (__ECC)
# define SG_COMPILER_STR "Intel C++ version " SG_STRINGIZE(__ICC)
#endif // __ICC
//
// Platform dependent gl.h and glut.h definitions
//
#ifdef __APPLE__
# define SG_MAC
# define SG_UNIX
#endif
#if defined (__FreeBSD__)
# define SG_UNIX
#endif
#if defined (__CYGWIN__)
# define SG_WINDOWS
# define SG_UNIX
# include <ieeefp.h> // isnan
#endif
// includes both MSVC and mingw compilers
#if defined(_WIN32) || defined(__WIN32__)
# define SG_WINDOWS
#endif
#if defined(__linux__) || defined(_AIX) || defined ( sgi )
# define SG_UNIX
#endif
#ifdef __GNUC__
#define SG_DEPRECATED(func) func __attribute__ ((deprecated))
#elif defined(_MSC_VER)
#define SG_DEPRECATED(func) __declspec(deprecated) func
#else
#pragma message("WARNING: You need to implement SG_DEPRECATED for this compiler")
#define SG_DEPRECATED(func) func
#endif
#if defined(__clang__)
# define SG_NO_RETURN [[noreturn]]
#else
# define SG_NO_RETURN
#endif
//
// No user modifiable definitions beyond here.
//
#endif // _SG_COMPILER_H
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