ryan77627/guix
1
0
Fork 0
mirror of https://git.in.rschanz.org/ryan77627/guix.git synced 2024-12-24 13:28:12 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

doc: Update note on Emacs packages.

Browse source 
* doc/guix.texi ("Emacs packages"): Expand note to talk about differences
between native compilation upstream and as used in Guix.
This commit is contained in:
Liliana Marie Prikler 2024-06-23 15:17:07 +02:00
parent 93c48a813d
commit 8546ca946e
No known key found for this signature in database
GPG key ID: 442A84B8C70E2F87
1 changed files with 21 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
doc/guix.texi
View file

@ -1878,15 +1878,28 @@ running Emacs with the @option{--no-site-file} option (@pxref{Init
File,,, emacs, The GNU Emacs Manual}).
@quotation Note
Emacs can now compile packages natively. Under the default
configuration, this means that Emacs packages will now be
just-in-time (JIT) compiled as you use them, and the results
stored in a subdirectory of your @code{user-emacs-directory}.
Most Emacs variants are now capable of doing native compilation.
The approach taken by Guix Emacs however differs greatly
from the approach taken upstream.
Furthermore, the build system for Emacs packages transparently
supports native compilation, but note, that
@code{emacs-minimal}---the default Emacs for building
packages---has been configured without native compilation.
Upstream Emacs compiles packages just-in-time and typically places
shared object files in a special folder within your
@code{user-emacs-directory}.
These shared objects within said folder are organized in a
flat hierarchy, and their file names contain two hashes to
verify the original file name and contents of the source code.
Guix Emacs on the other hand prefers to compile packages ahead-of-time.
Shared objects retain much of the original file name and no hashes
are added to verify the original file name or the contents of the file.
Crucially, this allows Guix Emacs and packages built against it
to be grafted (@pxref{Security Updates, grafts}), but at the same time,
Guix Emacs lacks the hash-based verification of source code baked
into upstream Emacs. As this naming schema is trivial to exploit,
we disable just-in-time compilation.
Further note, that @code{emacs-minimal}---the default Emacs
for building packages---has been configured without native compilation.
To natively compile your emacs packages ahead of time, use a
transformation like @option{--with-input=emacs-minimal=emacs}.
@end quotation