[boost] auto-link with gcc/windows

Subject: [boost] auto-link with gcc/windows
From: Robert Ramey (ramey_at_[hidden])
Date: 2010-07-05 13:35:02

I've been seeing a problem in building MinGW version of he 
serializationalization library.
This is related to auto-link.

Now I notice that in config/compiler/gcc.hpp we've got:

#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 2)) && 
defined(__GXX_EXPERIMENTAL_CXX0X__)

# define BOOST_HAS_DECLTYPE
...
# define BOOST_NO_DECLTYPE

Also in another part of the same file I find:

#if __GNUC__ >= 4
# if defined(_WIN32) || defined(__WIN32__) || defined(WIN32)
// All Win32 development environments, including 64-bit Windows and MinGW, 
define
// _WIN32 or one of its variant spellings. Note that Cygwin is a POSIX 
environment,
// so does not define _WIN32 or its variants.
# define BOOST_HAS_DECLSPEC

In my code I use BOOST_HAS_DECLSPEC but I'm having problems with
mingw.  I'm not sure it has anything to do with this, but it's not at clear 
to me
what the differing meanings are of  BOOST_HAS_DECLTYPE and
BOOST_HAS_DECLSPEC.

Robert Ramey