/usr/include/OpenEXR/ImathPlatform.h is in libilmbase-dev 1.0.1-6.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// Copyright (c) 2002, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IMATHPLATFORM_H
#define INCLUDED_IMATHPLATFORM_H
//----------------------------------------------------------------------------
//
// ImathPlatform.h
//
// This file contains functions and constants which aren't
// provided by the system libraries, compilers, or includes on
// certain platforms.
//----------------------------------------------------------------------------
#include <math.h>
#if defined _WIN32 || defined _WIN64
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#endif
//-----------------------------------------------------------------------------
//
// Fixes for the "restrict" keyword. These #ifdef's for detecting
// compiler versions courtesy of Boost's select_compiler_config.hpp;
// here is the copyright notice for that file:
//
// (C) Copyright Boost.org 2001. Permission to copy, use, modify, sell and
// and distribute this software is granted provided this copyright notice
// appears in all copies. This software is provided "as is" without express
// or implied warranty, and with no claim as to its suitability for any
// purpose.
//
// Some compilers support "restrict", in which case we do nothing.
// Other compilers support some variant of it (e.g. "__restrict").
// If we don't know anything about the compiler, we define "restrict"
// to be a no-op.
//
//-----------------------------------------------------------------------------
#if defined __GNUC__
#if !defined(restrict)
#define restrict __restrict
#endif
#elif defined(__INTEL_COMPILER) || defined(__ICL) || defined(__ICC) || defined(__ECC)
// supports restrict, do nothing.
#elif defined __sgi
// supports restrict, do nothing.
#else
#define restrict
#endif
#endif // INCLUDED_IMATHPLATFORM_H
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