[Issue 23193] druntime/win32.mak contains no instructions for how to build druntime

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23193

--- Comment #4 from Walter Bright <bugzilla at digitalmars.com> ---
What I do is make a git zip of the druntime repository, unzip it into a
directory, and try to build it.

This requires:

1. What compiler will be used to compile it? How do I set it?

2. What arguments need to be passed to the win32.mak? I.e.

   make -f win32.mak ????????

What are the targets that the user should use and what do they do?

3. There's a DMD and a HOST_DMD. ??????

4. Which variables are the user supposed to set?

5. Which make program should be used?

6. Sadly, not a single variable is documented.

Why is this so hard to explain?

Same problems with win64.mak, which, ironically, is also used to build
32mscoff, I presume, though there are no instructions for that, either. I
looked at the wiki page recommended by README.md for build instructions,

http://wiki.dlang.org/Building_DMD

which is epic in its complete uselessness.

--