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 15:52:15

On 11/1/2013 2:13 PM, Beman Dawes wrote:
> On Fri, Nov 1, 2013 at 1:54 PM, Edward Diener <eldiener_at_[hidden]>wrote:
>
>> 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.
>>
>
> IMO that is the best way to handle this. No point in Boosters putting in
> effort to work around a problem so serious it blocks most use of clang on
> windows anyhow. They will have to fix it if they are serious about clang
> and windows.
>
> If you send me the bugzilla number, I'll drop Chandler Carruth a note
> asking them to give it high priority. The squeaky wheel gets the grease.

I filed the bug report and it is #17773 at 
http://llvm.org/bugs/show_bug.cgi?id=17773.