[Boost-users] [fusion/tr1] Include path problem?

From: Kimon Hoffmann (Kimon.Hoffmann_at_[hidden])
Date: 2007-07-19 10:37:18

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Hi all,

while setting up the include paths as specified in the TR1 documentation
I stumbled across a Boost.Fusion related compile error (included
indirectly from <xpressive/proto/proto.hpp> in my code).

After stepping through the include hierarchy, I was able to extract this
minimal example, that demonstrates the problem:

- -------- START: Test.cpp --------

// Originally included from <boost/xpressive/proto/proto_fwd.hpp>
#include <boost/spirit/fusion/sequence/tuple_forward.hpp>

// Originally included from #include <boost/xpressive/proto/op_base.hpp>
#include <boost/spirit/fusion/sequence/tuple.hpp>

- -------- END: Test.cpp --------

With MSVC++ 8.0 SP1 This file fails to compile with certain include path
orderings while it compiles fine with others. The error messages are:

...\boost\spirit\fusion\sequence\make_tuple.hpp(23) : error C2027: use
of undefined type 'boost::fusion::tuple<>'
...\boost\spirit\fusion\sequence\make_tuple.hpp(23) : error C2079:
'boost::fusion::make_tuple' uses undefined struct 'boost::fusion::tuple<>'
...\include\boost\spirit\fusion\sequence\make_tuple.hpp(24) : error
C2514: 'boost::fusion::tuple<>' : class has no constructors

Working include path orderings:
1. Any include path ordering that doesn't contain Boost.TR1
2. VC++ Standard Library, regular Boost, Boost.TR1
3. VC++ Standard Library, Boost.TR1, regular Boost

Non-working include path orderings:
1. Boost.TR1, regular Boost, VC++ Standard Library [*]
2. Regular Boost, Boost.TR1, VC++ Standard Library

[*] Preferred Boost.TR1 setting

Generally speaking I would not consider this a problem, as I can simply
order the include directories accordingly, but, as far as I understand
it, Boost.TR1 can not be expected to work correctly with any of these
settings.

Regards,
  Kimon

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