Profiling DMD's Compilation Time with dmdprof

[Joakim]

On Thursday, 8 November 2018 at 04:16:44 UTC, Manu wrote:
> On Tue, Nov 6, 2018 at 10:05 AM Vladimir Panteleev via 
> Digitalmars-d-announce <digitalmars-d-announce at puremagic.com> 
> wrote:
>> [...]
>
> "Indeed, a clean build of DMD itself (about 170’000 lines of D 
> and 120’000 lines of C/C++) takes no longer than 4 seconds to 
> build on a rather average developer machine."
>
> ...what!? DMD takes me... (compiling) ... 1 minute 40 seconds 
> to build! And because DMD does all-files-at-once compilation, 
> rather than separate compilation for each source file, whenever 
> you change just one line in one file, you incur that entire 
> build time, every time, because it can't just rebuild the one 
> source file that changed. You also can't do multi-processor 
> builds with all-in-one build strategies.
>
> 4 seconds? That's just untrue. D is actually kinda slow these 
> days... In my experience it's slower than modern C++ compilers 
> by quite a lot.

It sounds like you're not using "a rather average developer 
machine" then, as there's no way DMD should be that slow to build 
on a core i5 or better:

https://forum.dlang.org/post/rqukhkpxcvgiefrdcvdq@forum.dlang.org