@kinke had the answer. The Windows versions get built with the make.exe that comes with dmc. It used to be included with the dmd distribution, but was removed.

On Monday, 27 June 2022 at 17:50:45 UTC, Walter Bright wrote:
> @kinke had the answer. The Windows versions get built with the make.exe that comes with dmc. It used to be included with the dmd distribution, but was removed.

Ummm...  'C:\DMC\dm\bin\make'

is what I indicated in:

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

the only thing you really need to do, is alter some vars, in the win64.mak for druntime and phobos (although the recent win64.mak for druntime seems to have removed all three of these vars completely?? so don't know what's going on there.

VCDIR=
SDKDIR=
CFLAGS=

for CFLAGS, I just use: CFLAGS=/Z7 /I"$(VCDIR)"\INCLUDE /I"$(SDKDIR)"\Include

for VCDIR and SDKDIR, it depends on your VS version, but you can run this code *within* a VS command prompt:

the output of this is what I enter into VCDIR= and SDKDIR=


// ----
int main()
{
    auto VCDIR = environment.get("VCToolsInstallDir");
    if (VCDIR is null) { return 1;}
    writeln("VCDIR=", VCDIR[0..$-1]); // also removes the trailing backslash

    auto SDKVersion = environment.get("WindowsSDKVersion");
    if (SDKVersion is null) { return 1;}

    auto SDKDIR = environment.get("WindowsSdkDir");
    if (SDKDIR is null) { return 1;}
    writeln("SDKDIR=", SDKDIR ~ "Include\\" ~ SDKVersion[0..$-1]); // also removes the trailing backslash

    return 0;
}
// -------

I was using that make, but it was failing. Turns out there was more than one version of make.exe.

On 6/27/2022 2:22 PM, forkit wrote:
> Ummm...  'C:\DMC\dm\bin\make'
> 
> is what I indicated in:
> 
> https://forum.dlang.org/post/bkdunhvzttbbuiepyeny@forum.dlang.org