Build Emacs but don’t compile elc

Build Emacs but don’t compile elc

[Fu Yuan]

Is there anyway to build Emacs but not compile lisp files? Every time I switch branch, I need to re-build Emacs, and compiling elc files takes quite a while. I couldn’t find an option to do so in ./configure, maybe there is an option somewhere that I’m not aware of?

Yuan

Re: Build Emacs but don’t compile elc

[Eli Zaretskii]

> From: Fu Yuan <casouri@gmail.com>
> Date: Tue, 3 Aug 2021 08:24:48 -0400
> 
> Is there anyway to build Emacs but not compile lisp files?

Building Emacs compiles only the Lisp files that were changed since
the last build.

> Every time I switch branch, I need to re-build Emacs, and compiling elc files takes quite a while. I couldn’t find an option to do so in ./configure, maybe there is an option somewhere that I’m not aware of?

No such option, and there cannot be: modified Lisp files _must_ be
recompiled.

My recommendation is not to switch branches in the same worktree: it
doesn't work very well in Emacs because the rate of changes during
development is very high.  Instead, use "git worktree add" to create a
separate worktree that uses the same .git directory, but tracks a
different branch.  then you can just switch to a different directory
when you need to work on another branch, and the massive recompilation
is avoided.

Re: Build Emacs but don’t compile elc

[Fu Yuan]

> 在 2021年8月3日，上午8:30，Eli Zaretskii <eliz@gnu.org> 写道：
> 
> 
>> 
>> From: Fu Yuan <casouri@gmail.com>
>> Date: Tue, 3 Aug 2021 08:24:48 -0400
>> 
>> Is there anyway to build Emacs but not compile lisp files?
> 
> Building Emacs compiles only the Lisp files that were changed since
> the last build.
> 
>> Every time I switch branch, I need to re-build Emacs, and compiling elc files takes quite a while. I couldn’t find an option to do so in ./configure, maybe there is an option somewhere that I’m not aware of?
> 
> No such option, and there cannot be: modified Lisp files _must_ be
> recompiled.
> 
> My recommendation is not to switch branches in the same worktree: it
> doesn't work very well in Emacs because the rate of changes during
> development is very high.  Instead, use "git worktree add" to create a
> separate worktree that uses the same .git directory, but tracks a
> different branch.  then you can just switch to a different directory
> when you need to work on another branch, and the massive recompilation
> is avoided.

git worktree is the way to do it, thanks!

Yuan