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

Subject: Re: [boost] decay.hpp - anonymous enum problem
From: Tim Burgess (tim_at_[hidden])
Date: 2013-11-18 10:37:47

Hi John,

I'm pretty much a newbie when it comes to Xcode, so I've no idea how to get
you that trace - the Issue Navigator gives me no clues as to what's
including/calling decay.hpp. Any clues/links to reading materials would be
most welcome. 

Best wishes.
Tim Burgess

-----Original Message-----
From: Boost [mailto:boost-bounces_at_[hidden]] On Behalf Of John Maddock
Sent: 18 November 2013 12:17
To: boost_at_[hidden]
Subject: Re: [boost] decay.hpp - anonymous enum problem

> 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.hp
> p
>
>
/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 

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