/usr/include/asio/detail/push_options.hpp is in libasio-dev 1.4.1-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// push_options.hpp
// ~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// No header guard
#if defined(__COMO__)
// Comeau C++
#elif defined(__DMC__)
// Digital Mars C++
#elif defined(__INTEL_COMPILER) || defined(__ICL) \
|| defined(__ICC) || defined(__ECC)
// Intel C++
#elif defined(__GNUC__)
// GNU C++
# if defined(__MINGW32__) || defined(__CYGWIN__)
# pragma pack (push, 8)
# endif
#elif defined(__KCC)
// Kai C++
#elif defined(__sgi)
// SGI MIPSpro C++
#elif defined(__DECCXX)
// Compaq Tru64 Unix cxx
#elif defined(__ghs)
// Greenhills C++
#elif defined(__BORLANDC__)
// Borland C++
# pragma option push -a8 -b -Ve- -Vx- -w-inl -vi-
# pragma nopushoptwarn
# pragma nopackwarning
# if !defined(__MT__)
# error Multithreaded RTL must be selected.
# endif // !defined(__MT__)
#elif defined(__MWERKS__)
// Metrowerks CodeWarrior
#elif defined(__SUNPRO_CC)
// Sun Workshop Compiler C++
#elif defined(__HP_aCC)
// HP aCC
#elif defined(__MRC__) || defined(__SC__)
// MPW MrCpp or SCpp
#elif defined(__IBMCPP__)
// IBM Visual Age
#elif defined(_MSC_VER)
// Microsoft Visual C++
//
// Must remain the last #elif since some other vendors (Metrowerks, for example)
// also #define _MSC_VER
# pragma warning (disable:4103)
# pragma warning (push)
# pragma warning (disable:4127)
# pragma warning (disable:4244)
# pragma warning (disable:4355)
# pragma warning (disable:4512)
# pragma warning (disable:4675)
# if defined(_M_IX86) && defined(_Wp64)
// The /Wp64 option is broken. If you want to check 64 bit portability, use a
// 64 bit compiler!
# pragma warning (disable:4311)
# pragma warning (disable:4312)
# endif // defined(_M_IX86) && defined(_Wp64)
# pragma pack (push, 8)
// Note that if the /Og optimisation flag is enabled with MSVC6, the compiler
// has a tendency to incorrectly optimise away some calls to member template
// functions, even though those functions contain code that should not be
// optimised away! Therefore we will always disable this optimisation option
// for the MSVC6 compiler.
# if (_MSC_VER < 1300)
# pragma optimize ("g", off)
# endif
# if !defined(_MT)
# error Multithreaded RTL must be selected.
# endif // !defined(_MT)
#endif
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