[Boost-bugs] [Boost C++ Libraries] #9705: Boost spirit fails to build with -DBOOST_NO_INTRINSIC_WCHAR_T

Subject: [Boost-bugs] [Boost C++ Libraries] #9705: Boost spirit fails to build with -DBOOST_NO_INTRINSIC_WCHAR_T
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-02-25 00:40:03

#9705: Boost spirit fails to build  with -DBOOST_NO_INTRINSIC_WCHAR_T
-------------------------------------------+---------------------
 Reporter:  Rocco Moretti <rmorettiase@…>  |      Owner:  djowel
     Type:  Bugs                           |     Status:  new
Milestone:  To Be Determined               |  Component:  spirit
  Version:  Boost 1.55.0                   |   Severity:  Problem
 Keywords:                                 |
-------------------------------------------+---------------------
 Attempting to compile a program for Android using Boost::Spirit runs into
 the following problem:

 Android compilation requires the -DBOOST_NO_INTRINSIC_WCHAR_T definition.
 This turns off BOOST_TT_AUX_BOOL_TRAIT_CV_SPEC1(is_integral,wchar_t,true)
 in boost/type_traits/is_integral.hpp

 This then causes to_utf8() called by info::info(utf8_string, wchar_t) in
 boost/spirit/home/support/info.hpp to fail, as it calls
 boost::detail::make_unsigned_imp<wchar_t> which does a static assertion
 that the template parameter type is_integral or is_enum in
 boost/type_traits/make_unsigned.hpp

 Note that in my parser I am not explicitly using wchar_t nor wstring - in
 fact I have no need of wchar/wstring support, with standard ASCII text
 being completely sufficient. (The string types I do explicitly use are
 std::string, character literals and boost::spirit::qi::ascii)

 Example of the issue in compiling the libs/spirit/example/qi/roman.cpp
 example:

 {{{

 $g++ --version
 g++ (GCC) 4.8.2

 $g++ -isystem /home/morettr/Downloads/boost_1_55_0/ -o roman.o -c
 roman.cpp # No defines, no problems.
 $g++ -isystem /home/morettr/Downloads/boost_1_55_0/ -o roman.o -c
 roman.cpp -DBOOST_NO_INTRINSIC_WCHAR_T -DBOOST_NO_CWCHAR
 -DBOOST_NO_STD_WSTRING
 In file included from
 /home/morettr/Downloads/boost_1_55_0/boost/proto/traits.hpp:24:0,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/proto/expr.hpp:27,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/proto/core.hpp:17,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/proto/proto.hpp:12,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/home/support/meta_compiler.hpp:19,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/home/qi/meta_compiler.hpp:14,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/home/qi/action/action.hpp:14,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/home/qi/action.hpp:14,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/home/qi.hpp:14,
                  from
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/include/qi.hpp:16,
                  from roman.cpp:18:
 /home/morettr/Downloads/boost_1_55_0/boost/type_traits/make_unsigned.hpp:
 In instantiation of ‘struct boost::detail::make_unsigned_imp<wchar_t>’:
 /home/morettr/Downloads/boost_1_55_0/boost/type_traits/make_unsigned.hpp:146:1:
 required from ‘struct boost::make_unsigned<wchar_t>’
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/home/support/utf8.hpp:35:52:
 required from ‘boost::spirit::utf8_string boost::spirit::to_utf8(Char)
 [with Char = wchar_t; boost::spirit::utf8_string =
 std::basic_string<char>]’
 /home/morettr/Downloads/boost_1_55_0/boost/spirit/home/support/info.hpp:54:44:
 required from here
 /home/morettr/Downloads/boost_1_55_0/boost/type_traits/make_unsigned.hpp:38:4:
 error: invalid application of ‘sizeof’ to incomplete type
 ‘boost::STATIC_ASSERTION_FAILURE<false>’
     BOOST_STATIC_ASSERT(
     ^

 }}}

 This was tested with 1.55.0, but as far as I can tell from looking at the
 code on GitHub, the problem should still exist for the current development
 version. Also, it's not Android compiler specific - the example above was
 done with standard g++ on an x86 Linux box.

 Desired outcome: All standard boost::spirit examples (except those which
 explicitly use wstring/wchar_t types) should compile and run with the
 "-DBOOST_NO_INTRINSIC_WCHAR_T -DBOOST_NO_CWCHAR -DBOOST_NO_STD_WSTRING"
 flag suite turned on.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9705>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.