[OT] Clang seems to implement modules

[Paulo Pinto]

On Wednesday, 21 November 2012 at 00:08:05 UTC, Leandro Lucarella 
wrote:
> Jonathan M Davis, el 20 de November a las 14:45 me escribiste:
>> On Tuesday, November 20, 2012 23:32:47 Paulo Pinto wrote:
>> > Am 20.11.2012 21:57, schrieb Walter Bright:
>> > > Since people already use precompiled headers with C++, I 
>> > > don't think
>> > > this change has much chance of making it compile faster.
>> > 
>> > Is it really so?
>> > 
>> > I would expect that with proper modules C++ compilers could 
>> > achieve
>> > compile times similar to what other module based languages 
>> > offer.
>> > Specially if templates are also stored in a module friendly 
>> > format.
>> > 
>> > But then again I lack enough compiler development experience 
>> > to be able
>> > to judge that.
>> > 
>> > Assuming you're right, then C++ is really a lost cause, and 
>> > the current
>> > trend of standards might follow what happened to Extended 
>> > ISO Pascal,
>> > which vendors ignored in favour of Turbo Pascal as the 
>> > defacto standard.
>> 
>> You should read this:
>> 
>> http://www.drdobbs.com/cpp/c-compilation-speed/228701711
>> 
>> It's an article by Walter explaining why C++ compilation 
>> speeds are so slow. Pre-compiled headers would help in some 
>> circumstances, but in others, they can't (because 
>> recompilation is required due to different preprocessor macros 
>> or whatnot).
>
> Did you ever cared about reading those slides?!?!? You keep 
> talking about
> problems with pre-compiled headers and what Doug Gregor is 
> suggesting are NOT
> pre-compiled headers. Those are already in clang AFAIK.
>
> What he is proposing is a real module system, macros will not 
> be re-evaluated
> inside modules. The symbols being global have nothing to do 
> with this being
> pre-compiled headers.
>
> Will this solve all the problems from C++ and make its compile 
> time blazingly
> fast? Probably not, but will sure help, not only to avoid 
> reading the same
> header over and over, but also by saving memory. But one thing 
> is certain,
> THIS IS NOT PRE-COMPILED HEADERS (he even mention pre-compiler 
> headers in the
> slides).
>
> For f*ck sake... Please, stop this misinformation madness.
>
> Thanks :)

That is my understanding as well.