Re: [boost] decay.hpp - anonymous enum problem

Subject: Re: [boost] decay.hpp - anonymous enum problem
From: John Maddock (john_at_[hidden])
Date: 2013-11-18 07:16:58

> I have a project for Windows/Mac that builds fine using VS2010, but
> generates errors when I build using Xcode 4.6 with the Apple-provided GCC
> 4.2 compiler (required, as this project also uses wxWidgets). All of my 
> own
> modules compile cleanly, but I get the following error output:
>
> SurfaceReader Group
> /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp
>
> /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:28:
> '<anonymous enum>' is/uses anonymous type
> /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:28:
> Trying to instantiate 'template<class T> struct boost::remove_reference'
> /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:38:
> '<anonymous enum>' is/uses anonymous type
> /users/tim/developer/libraries/boost_1_54_0/boost/type_traits/decay.hpp:38:
> Trying to instantiate 'template<class T> struct boost::remove_reference'
>
> I realise that I haven't provided the command that Xcode is using to build
> the project - this isn't deliberate, but I can't seem to locate where 
> Xcode
> provides this on-screen using the VoiceOver accessibility tool (I'm a
> totally blind developer). I don't include decay.hpp directly in any of my
> modules, but further research turned up:
>
> https://svn.boost.org/trac/boost/ticket/6362
>
> If I can find the anonymous enum within the files included within 
> decay.hpp
> I can patch it by providing a tag for the enum and I believe that this 
> will
> rectify the issue. Can anybody point me at the appropriate file, or have I
> got to plough through the lot?
>
> I initially discovered this issue in Boost 1.54.0, but I can also 
> reproduce
> it using 1.55.0.

I don't think this is anything to do with us: there are no anonymous unions 
in use in decay.hpp.  I suspect this is a problem with the actual type being 
passed to decay from your code: do you have the complete instantiation 
backtrace?

Sorry to not be more helpful, John