Re: [boost] [clang] Using clang in Windows

Subject: Re: [boost] [clang] Using clang in Windows
From: Paul A. Bristow (pbristow_at_[hidden])
Date: 2014-07-15 11:16:16

> -----Original Message-----
> From: Boost [mailto:boost-bounces_at_[hidden]] On Behalf Of Edward Diener
> Sent: 15 July 2014 15:48
> To: boost_at_[hidden]
> Subject: Re: [boost] [clang] Using clang in Windows
> 
> On 7/15/2014 5:01 AM, Paul A. Bristow wrote:
> >
> >
> >> -----Original Message-----
> >> From: Boost [mailto:boost-bounces_at_[hidden]] On Behalf Of
> >> Edward Diener
> >> Sent: 14 July 2014 22:08
> >> To: boost_at_[hidden]
> >> Subject: Re: [boost] [clang] Using clang in Windows
> >>
> >> On 7/14/2014 1:35 PM, Paul A. Bristow wrote:
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: Boost [mailto:boost-bounces_at_[hidden]] On Behalf Of
> >>>> Edward Diener
> >>>> Sent: 14 July 2014 08:06
> >>>> To: boost_at_[hidden]
> >>>> Subject: [boost] [clang] Using clang in Windows
> >>>>
> >>>> Just a note to everybody about using clang in Windows

<snip>

> > Perhaps we have to wait for Microsoft to produce an (presumably)
> > optional 'correct' pre-processor?
> 
> I recall some post about this related to one of the Boost developers talking
to Herb
> Sutter about the non-standard VC++ preprocessor and getting a verbal promise
that
> Microsoft would finally produce a standard conforming C++ preprocessor for
VC++.
> But I believe that Microsoft has made similar "noises" in that direction over
the years
> and nothing has ever happened so I am not sanguine about it happening anytime
> soon.

Can we produce any collective Boost wish to help this to happen?

> > This wait will not be what *you* want, of course!
> 
> What I do not want is to have to try to hack Boost PP in order to make clang
> targeting VC++ work. To clang's credit when I ran the Boost PP tests, which I
have
> largely expanded, in the 'develop' branch against the clang VC++
implementation,
> only a single test failed due to clang emulating VC++ preprocessor bugs.
> 
> I have argued vehemently in the clang developer mailing list that, although I
do now
> understand that clang targeting VC++ has to emulate some of VC++'s
preprocessor
> bugs in order to compile the VC++ header files, clang targeting VC++ should
> otherwise be a C++ standard conforming preprocessor for all other code. This
could
> be done pretty nicely via a pragma. But it does not seem to have made much of
an
> impression on others there. Many clang developers/users are so happy that they
can
> use clang in place of VC++ in the VS IDE that they cannot understand what a
poor
> C++ preprocessor VC++ is when one goes beyond fairly simple macro expansion
> techniques, as of course Boost PP does.

I think you may appear to the Clangers to be a 'lone' (perhaps loony? ;-)  PP
enthusiast.

Can we produce any collective Boost wish to help this to happen?

Although it is a can of worms, there must be some way to meet peoples needs, as
you explain above.

Paul

---
Paul A. Bristow
Prizet Farmhouse
Kendal UK LA8 8AB
[phone]