Re: [boost] [config] including typeinfo in dinkumware.hpp when RTTIisdisabled

Subject: Re: [boost] [config] including typeinfo in dinkumware.hpp when RTTIisdisabled
From: Edward Diener (eldiener_at_[hidden])
Date: 2013-11-01 13:54:57

On 11/1/2013 12:30 PM, Peter Dimov wrote:
> Edward Diener wrote:
>> Also, in the build of clang with the VC++ iDE, the _HAS_EXCEPTIONS=0
>> define is being used extensively.
>
> Judging by the compiler error, it appears that the standard library
> doesn't define std::exception at all when _HAS_EXCEPTIONS=0. Boost
> libraries do depend on std::exception as a base class for their own
> exception types even when exceptions are off, so its absence is likely
> to break a lot of things, not just <typeinfo>.

I agree with your analysis.

In VC++ RTTI, aka typeinfo, cannot be used without std::exception 
support. But perhaps we can at least circumvent this in Boost.config by 
not including typeinfo for vc++ if RTTI is turned off, which seems 
reasonable. I will work with that scenario locally and see what happens 
next. If it is totally unrealistic trying to compile Boost libraries 
with clang on Windows if RTTI and exception handling are turned off, I 
will mention this on the clang developer's forum and post a bug report 
against it on clang bugzilla.