[Issue 23193] druntime/win32.mak, win64.mak, posix.mak contain no instructions for how to build druntime

[d-bugmail at puremagic.com]

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

--- Comment #5 from Walter Bright <bugzilla at digitalmars.com> ---
Let's start with a `makefile` with the following contents:
-----
HOST_DMD=e:\dmd2.092\windows\bin\dmd.exe

all:
        make HOST_DMD=$(HOST_DMD) -f win32.mak

clean:
        make HOST_DMD=$(HOST_DMD) -f win32.mak clean
-----
Let's try it out:
-----
make clean
del lib\druntime.lib errno_c_32omf.obj
Could Not Find C:\forks\druntime\lib\druntime.lib
Could Not Find C:\forks\druntime\errno_c_32omf.obj
rmdir /S /Q doc import
The system cannot find the file specified.
The system cannot find the file specified.
-----

ok. Now let's try a build:

----
C:\forks\druntime>make
make HOST_DMD=e:\dmd2.092\windows\bin\dmd.exe -f win32.mak
"make" -f mak/WINDOWS import DMD="..\dmd\generated\windows\release\32\dmd"
HOST_DMD="e:\dmd2.092\windows\bin\d
md.exe" MODEL=32 IMPDIR="import"
..\dmd\generated\windows\release\32\dmd -conf= -c -o- -Isrc -Iimport
-Hfimport\core\sync\barrier.di src\core\s
ync\barrier.d

..\dmd\generated\windows\release\32\dmd -conf= -c -o- -Isrc -Iimport
-Hfimport\core\sync\condition.di src\core
\sync\condition.d

..\dmd\generated\windows\release\32\dmd -conf= -c -o- -Isrc -Iimport
-Hfimport\core\sync\config.di src\core\sy
nc\config.d

..\dmd\generated\windows\release\32\dmd -conf= -c -o- -Isrc -Iimport
-Hfimport\core\sync\exception.di src\core
\sync\exception.d

..\dmd\generated\windows\release\32\dmd -conf= -c -o- -Isrc -Iimport
-Hfimport\core\sync\mutex.di src\core\syn
c\mutex.d

..\dmd\generated\windows\release\32\dmd -conf= -c -o- -Isrc -Iimport
-Hfimport\core\sync\rwmutex.di src\core\s
ync\rwmutex.d

..\dmd\generated\windows\release\32\dmd -conf= -c -o- -Isrc -Iimport
-Hfimport\core\sync\semaphore.di src\core
\sync\semaphore.d


"make" -f mak/WINDOWS copydir DMD="..\dmd\generated\windows\release\32\dmd"
HOST_DMD="e:\dmd2.092\windows\bin\
dmd.exe" MODEL=32 IMPDIR="import"
Target 'copydir' is up to date

"make" -f mak/WINDOWS copy DMD="..\dmd\generated\windows\release\32\dmd"
HOST_DMD="e:\dmd2.092\windows\bin\dmd
.exe" MODEL=32 IMPDIR="import"
if not exist generated md generated
if not exist generated\windows md generated\windows
if exist "../../release-build/dmd-2.079.0/windows/bin/dmd.exe" (echo
@"../../release-build/dmd-2.079.0/windows
/bin/dmd.exe" %* >generated\windows\host_dmd.bat)
if not ""  == "" ("\dmd2\Windows\bin\dmd.exe" --version >nul 2>&1 && echo
@"\dmd2\Windows\bin\dmd.exe" %* >gen
erated\windows\host_dmd.bat)
if not ""  == "" (""  --version >nul 2>&1 && echo @"" %*
>generated\windows\host_dmd.bat)
if not "e:\dmd2.092\windows\bin\dmd.exe" == ""
("e:\dmd2.092\windows\bin\dmd.exe" --version >nul 2>&1 && echo
@"e:\dmd2.092\windows\bin\dmd.exe" %* >generated\windows\host_dmd.bat)
generated\windows\host_dmd.bat -of=generated\windows\copyimports.exe -m32
mak\copyimports.d
if not exist generated md generated
if not exist generated\windows md generated\windows
if exist "../../release-build/dmd-2.079.0/windows/bin/dmd.exe" (echo
@"../../release-build/dmd-2.079.0/windows
/bin/dmd.exe" %* >generated\windows\host_dmd.bat)
Error: command line too long

--- errorlevel 1

--- errorlevel 1
----------

Well, that crashed and burned. As you can see, it only partly created the
import directory (no import\core\stdc):

---
C:\forks\druntime>dir import
 Volume in drive C has no label.
 Volume Serial Number is 6E3B-6D44

 Directory of C:\forks\druntime\import

06/18/2022  11:52 PM    <DIR>          ..
06/18/2022  11:52 PM    <DIR>          core
06/18/2022  11:52 PM    <DIR>          .
               0 File(s)              0 bytes
               3 Dir(s)  209,004,240,896 bytes free

C:\forks\druntime>dir import\core
 Volume in drive C has no label.
 Volume Serial Number is 6E3B-6D44

 Directory of C:\forks\druntime\import\core

06/18/2022  11:52 PM    <DIR>          ..
06/18/2022  11:52 PM    <DIR>          .
06/18/2022  11:52 PM    <DIR>          sync
               0 File(s)              0 bytes
               3 Dir(s)  209,002,799,104 bytes free
---

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