Re: boost/rational.hpp and VS2019

From: John Emmas (john_at_[hidden])
Date: 2021-08-23 08:23:52

On 18/08/2021 14:11, Edward Diener via Boost-users wrote:
> On 8/18/2021 5:03 AM, John Emmas via Boost-users wrote:
>>
>> Safari seemed a bit happier so I installed ver 1.74 and eventually 
>> ver 1.77 - but they both give me the same error list :-(
>>
>> So I'm guessing this might be a Visual Studio issue.  Edward - do you 
>> happen to know which version of VS2019 you're running?
>
> I am running VS2019 16.10.3.
>

Hi Edward, there's been a development here after I flagged this up to 
Microsoft....

I sent them a small test project and it seems that for VS2019 16.11.0 
the problem only happens for an x86 build (if I build as x64 it works 
okay).  Going back to the command line you sent me last week, is there 
some way I can adapt it to force an x86 build and alternatively, an x64 
build?  I could then swap between them and see if there's any difference 
here.  And it looks like John Maddock might be onto something when he 
suggested modifying 'boost/integer/common_factor_rt.hpp'.  I'd be happy 
to try modifying it temporarily if John can suggest something...  Thanks,

John

On 16/08/2021 18:57, John Maddock via Boost-users wrote:
>
> #if ((defined(BOOST_MSVC) && (BOOST_MSVC >= 1600)) || 
> (defined(__clang__) && defined(__c2__)) || (defined(BOOST_INTEL) && 
> defined(_MSC_VER))) && (defined(_M_IX86) || defined(_M_X64))
> #include <intrin.h>
> #endif
>
> I'm wondering if the check for x86 needs to be applied to the 
> BOOST_MSVC check as well as the intel one?
>