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Re: How can I put together a small bare bones "Emacs for scripting" pack

From: Mathias Dahl
Subject: Re: How can I put together a small bare bones "Emacs for scripting" package?
Date: Fri, 24 Jan 2020 22:37:14 +0100

> Start with emacs.exe alone, and then add *.elc files according to
> error messages you get.  You will need lisp/term/w32-win.el at least,
> but other than that, I don't know.

I see you'd also need simple.elc (because we look for it at startup),
and with Emacs before 27 also mule-util.elc.  Emacs will probably
complain about a missing libexec directory, so create it.


Got it to work. 

Here seems to be the bare minimum structure needed for Emacs 26.3 on Windows 10:

... a lot of map files goes here ..

I could then successfully do this (from cmd.exe, a similar command also worked from Git Bash)

  C:\...> bin\emacs.exe --batch -Q --eval "(princ """This is cool!""")"
  This is cool!

I might write up something more detailed on EmacsWiki later. It took a bit of trial and error to get it to work and the error messages are only partly helpful (they mention looking in c:\emacs, a folder that does not exist, and which is not needed).

One thing that I noticed is the HUGE difference in size of the exe file between Emacs 24 and later versions. I listed the sizes of the folder when I keep my different Emacs versions:

8.8M    ./emacs-24.5-official/bin/emacs.exe
91M     ./emacs-25.1-2-x86_64-w64-mingw32_2016_11_16/bin/emacs.exe
119M    ./emacs-26.1-x86_64/bin/emacs.exe
120M    ./emacs-26.2-x86_64/bin/emacs.exe
130M    ./emacs-26.3-x86_64/bin/emacs.exe
16M     ./emacs-bin-w64-24.4/emacs/bin/emacs.exe
121M    ./emax64-bin-20180529/emax64/bin/emacs.exe
119M    ./old/emacs-26.1/bin/emacs.exe

Now, I can probably use an old version for the mentioned scenarios (using Emacs as a kind of scripting engine), but I am curious about the jump in sizes. I assume that later versions include something that was earlier "outside", in separate files, is that right? If I wanted to, could I reduce the size by building Emacs myself? Is this in some way related to "dumping Emacs"?


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