Profiling DMD's Compilation Time with dmdprof

[Manu]

On Tue, Nov 6, 2018 at 10:05 AM Vladimir Panteleev via
Digitalmars-d-announce <digitalmars-d-announce at puremagic.com> wrote:
>
> This is a tool + article I wrote in February, but never got
> around to finishing / publishing until today.
>
> https://blog.thecybershadow.net/2018/02/07/dmdprof/
>
> Hopefully someone will find it useful.

"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.