bug#38261: Recent changes to emacs build system

[brettg]

On 18.11.2019 22:34, address@hidden wrote:
> On 18.11.2019 21:33, address@hidden wrote:
> > On 18.11.2019 21:28, address@hidden wrote:
> > > On 18.11.2019 20:01, address@hidden wrote:
> > > > Hey all, the recent changes to the emacs build system result in a 
> > > > few
> > > > broken packages like emacs-pdf-tools, or basically anything that 
> > > > uses
> > > > a phase for emacs-set-emacs-load-path.
> > > >
> > > > For example, I borrowed the technique used by emacs-pdf-tools to
> > > > package emacs-telega, resulting in both packages failing to build:
> > > >
> > > > Here is the code for emacs-telega:
> > > >
> > > > https://git.sr.ht/~brettgilio/cfg/tree/master/channel/non-gnu/packages/emacs-xyz.scm#L99
> > > >
> > > > The issue is in this phase for both emacs-pdf-tools and my channel 
> > > > package:
> > > >
> > > >  (add-after 'compress-documentation 'emacs-set-emacs-load-path
> > > >                           (assoc-ref emacs:%standard-phases 
> > > > 'set-emacs-load-path))
> > > >
> > > > Resulting in:
> > > >
> > > > starting phase `emacs-set-emacs-load-path'
> > > > Backtrace:
> > > >            5 (primitive-load 
> > > > "/gnu/store/5b1p1gsvfyi4fbx4s42rhab2dns…")
> > > > In ice-9/eval.scm:
> > > >    191:35  4 (_ _)
> > > > In ice-9/boot-9.scm:
> > > >     829:9  3 (catch _ _ #<procedure 7ffff3bbb518 at 
> > > > /gnu/store/zmkg…> …)
> > > > In srfi/srfi-1.scm:
> > > >    863:16  2 (every1 #<procedure 7ffff30ae160 at 
> > > > /gnu/store/zmkgrvv…> …)
> > > > In
> > > > /gnu/store/zmkgrvvhmrix2b1z7id6zrg9bb7qxzdl-module-import/guix/build/gnu-build-system.scm:
> > > >    839:30  1 (_ _)
> > > > In unknown file:
> > > >            0 (_ #:source 
> > > > "/gnu/store/qw8xbmk6ryl9a2jrp0gip3yffmsdix…" …)
> > > >
> > > > ERROR: Wrong type to apply: #f
> > > >
> > > > If we suspect that changes are going to be non-backwards compatible
> > > > could we use the news system to pass along that message? Much
> > > > appreciated. Thanks.
> > > >
> > > > Brett Gilio
> > >
> > > I applied a hotfix to the package by replacing 'set-emacs-load-path
> > > with 'add-source-to-load-path. I believe this fix would work for all
> > > other affected packages.
> >
> > https://git.sr.ht/~brettgilio/cfg/commit/c24a6db9d25151c487e9db675bd74e4bb3912173
>
> Ricardo, just wanted to make you aware that this emacs-build-system
> change does break your guile-studio. I discovered this because I
> adopted some of your ideas of autoloading in the generated emacs lisp
> from guile-studio when creating my own emacs configuration dependent
> on guix, which resulted in
>
> progn: Wrong number of arguments: (lambda nil "Autoload Emacs packages
> found in EMACSLOADPATH.
>
> 'Autoload' means to load the 'autoloads' files matching
> `guix-emacs-autoloads-regexp'." (interactive) (let* ((emacs-load-path
> (getenv "EMACSLOADPATH")) (emacs-non-core-load-path-directories
> (seq-filter (function (lambda (dir) (string-match-p
> "/share/emacs/site-lisp" dir))) (split-string emacs-load-path ":")))
> (autoloads (mapcan (function guix-emacs-find-autoloads)
> emacs-non-core-load-path-directories))) (mapc (function (lambda (f)
> (load f (quote noerror)))) autoloads))), 78
>
> I'll let you know if I can find any fix for this when I get some time.
> But just wanted to pass the message along.
>
> Brett

I tried removing the arguments passed to `guix-emacs-autoload-packages' 
as the updated version 
(http://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/aux-files/emacs/guix-emacs.el?id=47b3b4c2aa49e21f4cc32c97ff7bbbd069bb849c) 
does not carry arguments anymore, instead depending on a variable 
EMACSLOADPATH. However, whenever that is done it returns

split-string: Wrong type argument: stringp, nil

possibly because my system is not finding EMACSLOADPATH.

I will keep investigating.