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From: "Stefan Ring (stefanrin AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Sat, 8 Nov 2025 20:28:49 +0100
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Subject: Re: How to cross compile djgpp software from Unix to DOS?
To: djgpp AT delorie DOT com
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On Tue, Nov 4, 2025 at 10:16 PM Stefan Ring <stefanrin AT gmail DOT com> wrote:
>
> Building it natively on Windows XP or Vista 32bit works and produces a
> working executable. Building on DOS with doslfn also works, but is
> significantly slower (I would think around 10 times slower).

As my mind had turned to this topic anyway, I fired up a real machine
in order to test building it on bare-metal DOS. Sure enough, it was
slow as molasses, but it made me notice the source of that slowness:
the HD led would show constant activity. It looks as if smartdrv
became completely immobilized when doslfn is loaded. I started an
experimental CI build on GitHub Actions a few months ago, and it used
to take 2h25m to compile bash. Because of the discovery with the HD
led, I moved everything to a RAM drive, and now it finishes in 13
minutes. Still a lot longer than the 3-4 minutes it takes on Windows
XP/Vista, but a lot more reasonable. And somewhat reproducible, which
was the entire point of this exercise.

https://github.com/Ringdingcoder/dosbuild-test/actions/runs/19197309887