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Editorial Team
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Asked: 2026-05-27T21:02:01+00:00

xcode 4.2 os x 10.7 when i set my includes to look like: #include

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xcode 4.2
os x 10.7

when i set my includes to look like:

#include <iostream>
#include <boost/thread.hpp>

I get the following error from a file located at /opt/local/include/boost/tr1/tr1

Lexical or Preprocessor Issue
'boost/tr1/detail/config_all.hpp' file not found

Contents of the /opt/local/include/boost/tr1/tr1/iostream file:

//  (C) Copyright John Maddock 2005.
//  Use, modification and distribution are subject to 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)
//
//  This file exists to prevent std lib headers from accidentally
//  including a TR1 extention header; we must suppress this otherwise
//  we can end up with cyclic dependencies with some std lib implementations.
//
#ifndef BOOST_TR1_iostream_INCLUDED
#  define BOOST_TR1_iostream_INCLUDED
#  ifndef BOOST_TR1_NO_RECURSION
#     define BOOST_TR1_NO_RECURSION
#     define BOOST_TR1_NO_iostream_RECURSION
#  endif
#  include <boost/tr1/detail/config_all.hpp>
#  if defined(BOOST_HAS_INCLUDE_NEXT) && !defined(BOOST_TR1_DISABLE_INCLUDE_NEXT)
#     include_next <iostream>
#  else
#     include BOOST_TR1_STD_HEADER(iostream)
#  endif
#  ifdef BOOST_TR1_NO_iostream_RECURSION
#     undef BOOST_TR1_NO_iostream_RECURSION
#     undef BOOST_TR1_NO_RECURSION
#  endif
#endif

I should be using the iostream header located at /Developer/SDKs/MacOSX10.7.sdk/usr/include/c++/4.2.1/

You will have to forgive me as I am very new to c++ and even more new to xcode. Thank you in advance for any help.

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1 Answer

  1. Editorial Team

    Definitely turn off recursive searches. You should never be able to include a boost header without specifying the complete boost path. Much of Boost is sort of a training ground for features that will make their way into the standard eventually, and as such there are a great number of Boost headers that share the same name as standard headers. There are also a bunch of boost headers that share the same name as other boost headers. There is no end to the grief this will cause you.

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