text: /*=============================================================================
      Copyright (c) 2001-2003 Joel de Guzman
      http://spirit.sourceforge.net/
  
    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)
  =============================================================================*/
  #if !defined(BOOST_SPIRIT_CONFIG_HPP)
  #define BOOST_SPIRIT_CONFIG_HPP
  
  #include <boost/config.hpp>
  
  ///////////////////////////////////////////////////////////////////////////////
  //
  //  Compiler check:
  //
  //  Historically, Spirit supported a lot of compilers, including (to some
  //  extent) poorly conforming compilers such as VC6. Spirit v1.6.x will be
  //  the last release that will support older poorly conforming compilers.
  //  Starting from Spirit v1.8.0, ill conforming compilers will not be
  //  supported. If you are still using one of these older compilers, you can
  //  still use Spirit v1.6.x.
  //
  //  The reason why Spirit v1.6.x worked on old non-conforming compilers is
  //  that the authors laboriously took the trouble of searching for
  //  workarounds to make these compilers happy. The process takes a lot of
  //  time and energy, especially when one encounters the dreaded ICE or
  //  "Internal Compiler Error". Sometimes searching for a single workaround
  //  takes days or even weeks. Sometimes, there are no known workarounds. This
  //  stifles progress a lot. And, as the library gets more progressive and
  //  takes on more advanced C++ techniques, the difficulty is escalated to
  //  even new heights.
  //
  //  Spirit v1.6.x will still be supported. Maintenance and bug fixes will
  //  still be applied. There will still be active development for the back-
  //  porting of new features introduced in Spirit v1.8.0 (and Spirit 1.9.0)
  //  to lesser able compilers; hopefully, fueled by contributions from the
  //  community. For instance, there is already a working AST tree back-port
  //  for VC6 and VC7 by Peder Holt.
  //
  //  If you got here somehow, your compiler is known to be poorly conforming
  //  WRT ANSI/ISO C++ standard. Library implementers get a bad reputation when
  //  someone attempts to compile the code on a non-conforming compiler. She'll
  //  be confronted with tons of compiler errors when she tries to compile the
  //  library. Such errors will somehow make less informed users conclude that
  //  the code is poorly written. It's better for the user to see a message
  //  "sorry, this code has not been ported to your compiler yet", than to see
  //  pages and pages of compiler error messages.
  //
  /////////////////////////////////////////////////////////////////////////////////
  #if     (defined(BOOST_MSVC) && (BOOST_MSVC < 1310))                            \
      ||  (defined(__BORLANDC__) && (__BORLANDC__ <= 0x570))                      \
      ||  (defined(__GNUC__) && (__GNUC__ < 3))                                   \
      ||  (defined(__GNUC__) && (__GNUC__ == 3) && (__GNUC_MINOR__ < 1))
  # error "Compiler not supported. See note in <boost/spirit/core/config.hpp>"
  #else
  // Pass... Compiler supported.
  #endif
  
  #endif
  