Unable to generate xml with Boost on Windows and MSVC

[espdev]

Hi, everyone!

I'm trying to generate Python wrappings via WrapITK for my C++ project. The project also uses Boost libraries. I'm getting the following errors while generating xml for sources that include Boost headers:

In file included from C:/Boost/boost/filesystem.hpp:16:
In file included from C:/Boost/boost/filesystem/path.hpp:25:
In file included from C:/Boost/boost/filesystem/path_traits.hpp:22:
In file included from C:/Boost/boost/type_traits/decay.hpp:18:
In file included from C:/Boost/boost/mpl/eval_if.hpp:17:
C:/Boost/boost/mpl/if.hpp:131:1: error: pasting formed 'BOOST_PP_TUPLE_ELEM_O_3(', an invalid preprocessing token [-Winvalid-token-paste]
BOOST_MPL_AUX_NA_SPEC(3, if_)
^
C:/Boost/boost/mpl/aux_/na_spec.hpp:161:40: note: expanded from macro 'BOOST_MPL_AUX_NA_SPEC'
#define BOOST_MPL_AUX_NA_SPEC(i, name) \
                                       ^
C:/Boost/boost/mpl/aux_/na_spec.hpp:154:47: note: expanded from macro '\
BOOST_MPL_AUX_NA_SPEC_NO_ETI'
#define BOOST_MPL_AUX_NA_SPEC_NO_ETI(i, name) \
                                              ^
C:/Boost/boost/mpl/aux_/na_spec.hpp:65:9: note: expanded from macro '\
BOOST_MPL_AUX_NA_SPEC_MAIN'
        BOOST_MPL_PP_NESTED_DEF_PARAMS_TAIL(i, typename T, na) \
        ^
note: (skipping 5 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
C:/Boost/boost/preprocessor/tuple/elem.hpp:26:42: note: expanded from macro 'BOOST_PP_TUPLE_ELEM'
#        define BOOST_PP_TUPLE_ELEM(...) BOOST_PP_TUPLE_ELEM_I(BOOST_PP_OVERLOAD(BOOST_PP_TUPLE_ELEM_O_, __VA_ARGS__), (__VA_ARGS__))
                                         ^
C:/Boost/boost/preprocessor/tuple/elem.hpp:27:48: note: expanded from macro 'BOOST_PP_TUPLE_ELEM_I'
#        define BOOST_PP_TUPLE_ELEM_I(m, args) BOOST_PP_TUPLE_ELEM_II(m, args)
                                               ^
C:/Boost/boost/preprocessor/tuple/elem.hpp:28:64: note: expanded from macro 'BOOST_PP_TUPLE_ELEM_II'
#        define BOOST_PP_TUPLE_ELEM_II(m, args) BOOST_PP_CAT(m ## args,)
                                                               ^

I use Windows 7/8.1 x64 and MS VisualStudio 2013. Boost 1.56

CastXML Version:

castxml version 0.1-g2e55b35

CastXML project maintained and supported by Kitware (kitware.com).

clang version 3.7.0 (tags/RELEASE_370/rc1)
Target: x86_64-pc-windows-msvc
Thread model: posix

(Prebuilt windows binary from here)

[bradking]

I think the problem is that CastXML is a Clang parser but is simulating MSVC's preprocessor, so Boost's preprocessor library is using MSVC-specific code instead of its implementation for Clang. In the past with gccxml this worked because the Boost headers gained explicit knowledge of gccxml here.

Something similar may be needed for CastXML, but currently CastXML does not define any macro to identify itself.

[bradking]

CastXML does not define any macro to identify itself.

Commit d2ef49b adds predefined macros that identify both CastXML and the internal Clang version against which it was built. This provides enough information for the Boost preprocessor library to adapt (via boost/config/select_compiler_config.hpp) to the CastXML preprocessor behavior.

Actually modifying Boost with this information is beyond the scope of CastXML development.

[espdev]

@bradking thank you!
I will send an issue to Boost to support CastXML preprocessor behavior.

[ibrawada]

Hi,

I'm currently facing these issues. Boost doesn't have CastXML support. Is there any workaround that I could use?

I use: Window 10, Boost 1.70, msvc2022, CastXML 0.4.3