How fast is D compilation compared to C++?

[ryuukk_]

On Wednesday, 21 September 2022 at 07:55:22 UTC, Paulo Pinto 
wrote:
> On Tuesday, 20 September 2022 at 22:10:52 UTC, ryuukk_ wrote:
>> On Tuesday, 20 September 2022 at 20:41:45 UTC, Ali Çehreli 
>> wrote:
>>> On 9/20/22 12:10, Krzysztof Jajeśnica wrote:
>>>
>>> > You should only treat these numbers as very rough estimates,
>>> since I'm
>>> > not exactly comparing apples to apples here.
>>>
>>> Of course. I appreciate your taking time to measure the build 
>>> times.
>>>
>>> Ali
>>
>> My game engine, wich is quite big now, compiles in 1second 
>> with dmd, ~1.5sec with ldc, in debug build
>>
>> A full clean rebuild!
>>
>> My old c++ game engine project full recompiles in ~30 seconds
>>
>>
>>
>> Long live D!
>
> I advise to eventually cross check those numbers against C++ 
> modules.
>
> In Visual C++, the C++23 "import std" (which includes the 
> complete standard library), is faster than a plain "#include 
> <iostream>".
>
> Naturally for the forseable future, C++ modules are something 
> that only Visual C++ users can enjoy, as other commercial 
> vendors with forks taken out of GCC and clang aren't that keen 
> into providing upstream support for better ISO C++ compliance.

I tried C++20 modules when visual studio added support for it

It made a huge improvement, but you still had to forward declare 
everything, wich i don't want to do anymore, hence why i quit C++ 
and rewrote my engine in D, wich is now much larger than the C++ 
one, and yet still fully compiles in 1sec with dmd (i do not use 
phobos, i do use templates and type introspection, with care! i 
run my build always with time, so i know whenever i introduce 
something that slow things down)