[cfe-dev] [libc++] incomplete type 'std::__1::ios_base'

[Howard Hinnant]

Filed boost bug report:

https://svn.boost.org/trac/boost/ticket/5887

Thanks Ryuta and Marc!

Howard

On Sep 10, 2011, at 6:56 AM, Ryuta Suzuki wrote:

> Hi Marc,
> 
> Just as you pointed out, it was boost's fault. Patching flex_string.hpp like
> 
> --- ./boost/wave/util/flex_string.hpp.orig    2011-09-10 18:15:29.916482429 +
> 0900
> +++ ./boost/wave/util/flex_string.hpp    2011-09-10 18:18:58.687781264 +0900
> @@ -103,7 +103,7 @@
>  #include <limits>
>  #include <stdexcept>
>  
> -#if defined(__PATHSCALE__)
> +#if defined(__PATHSCALE__) || defined(__clang__)
>    #include <ios>
>  #else
>    #include <iosfwd>
> 
> fixed the problem, though I still have other boost issues.
> Anyway, thanks for the tip! I appreciate it.
> 
> Regards,
> 
> Ryuta
> 
> On Sat, Sep 10, 2011 at 5:38 PM, Marc Glisse <marc.glisse at inria.fr> wrote:
> On Sat, 10 Sep 2011, Ryuta Suzuki wrote:
> 
> I've got the following compilation error while attempting to build
> boost-1.47.0 with 'clang++ -stdlib=libc++':
> [...]
> 
> In file included from ../boost/wave/wave_config.hpp:229:
> ../boost/wave/util/flex_string.hpp:2573:34: error: incomplete type
> 'std::__1::ios_base' named in nested name specifier
>                 is.setstate(std::ios_base::eofbit);
>                             ~~~~~^~~~~~~~~~
> /usr/include/c++/v1/iosfwd:95:7: note: forward declaration of
> 'std::__1::ios_base'
> class ios_base;
>       ^
> 
> Is this a bug in libc++ or something wrong with boost itself?
> 
> With boost I'd say. It looks like:
> 
> #if defined(__PATHSCALE__)
>  #include <ios>
> #else
>  #include <iosfwd>
> #endif
> 
> but ios_base is in <ios> so that one should be included always.
> 
> -- 
> Marc Glisse
> 
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