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Date: Sun, 02 Nov 2025 20:24:38 +0200
Message-Id: <86v7jsgumx.fsf@gnu.org>
From: "Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To: djgpp AT delorie DOT com
In-Reply-To:
	<ahuNp1rAxw3Ko15_Mn4lCOaOI5eV9RjS8SdHWlzh3PZKtZK2wXG6jUKt1P3_YK1jX6BL_bHBdLjobDxyB7FMz3UM5t3t14ACCv3lFR2QIuc=@proton.me>
	(djgpp AT delorie DOT com)
Subject: Re: How to cross compile djgpp software from Unix to DOS?
References: <ahuNp1rAxw3Ko15_Mn4lCOaOI5eV9RjS8SdHWlzh3PZKtZK2wXG6jUKt1P3_YK1jX6BL_bHBdLjobDxyB7FMz3UM5t3t14ACCv3lFR2QIuc=@proton.me>
Reply-To: djgpp AT delorie DOT com

> 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.