Why is 64-bit dmd not built as part of the Windows release?

[Atila Neves]

I don't know why even bother with 32-bit dmd to begin with, but 
at least there should be an option.

I just spent 45min trying to build 64-bit dmd on Windows. It 
wasn't fun. "Isn't it just make -f win64.mak?", I hear you ask. 
Yes. If you want a version with debug messages turned on. It took 
me 45min to learn that disabling those is... non-trivial.

As it turns out, trying to build dmd yourself from the released 
tag and replacing the .exe from the installer by the one you 
created works, unless:

1. You remove -debug
2. You add -O

If you do #1 or #2, then the produced dmd.exe doesn't work. At 
all. 32 *or* 64 bits. And this is something you need to edit the 
makefile for, trying to do that from the command line was an 
exercise in futility.

"How does the installer-built version work then?", I again hear 
you ask. No idea. Debug 64-bit dmd it is!

I *would* try and add a 64-bit dmd to the installer, but 
apparently to build the Windows installer you need a special 
Windows box commisioned by the Vatican and blessed by the Pope 
himself.

Atila