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Date: Mon, 03 Nov 2025 18:53:36 +0000
To: djgpp AT delorie DOT com
From: "John Doe (altaptitude AT proton DOT me) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Subject: Re: How to cross compile djgpp software from Unix to DOS?
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> > Date: Sun, 02 Nov 2025 16:43:45 +0000
> > From: "John Doe (altaptitude AT proton DOT me) [via djgpp AT delorie DOT com]" djgpp AT delorie DOT com
> > 
> > I have a djgpp cross-compiler (i586-pc-msdosdjgpp-gcc) setup on GNU/Linux after following the instructions on the website and have confirmed it functions correctly. However i'm not sure how i can use it to compile djgpp software, such as emacs, for DOS. The v2gnu/ emacs READMEs as well as msdos/INSTALL in the emacs source tree only explain how to do it on a DOS system with djgpp.
> 
> 
> Emacs doesn't support cross-compilation, because part of the Emacs
> build process needs to run the Emacs binary just built.
> 
> This has nothing to do with DOS or DJGPP, it's just a missing feature
> in Emacs: no one has yet figured out how to remove this limitation.

Ok i guess Emacs was a bad example, however i'm having trouble with other djgpp software too. Djgpp's Bash docs also only have instructions for compiling on DOS, and when i tried running 'make bash.exe CC=i586-pc-msdosdjgpp-gcc' it would fail because it would try to run the .exe file in the directory (./mksyntax.exe) which obviously a GNU/Linux system can't do so that would fail. I couldn't find where exactly it was instructed to run those so i couldn't remove that. I had no success running the configure scripts myself with --host=i586-pc-msdosdjgpp or CC=i586-pc-msdosdjgpp-gcc either.