bug#38533: emacs-auctex breaks url package

[Maxim Cournoyer]

Hello Diego,

Diego Nicola Barbato <address@hidden> writes:

> Hi Guix,
>
> AUCTeX breaks Emacs' bult-in url package.  This bug appears to have been
> introduced with commit 3ffdd00 and can be reproduced as follows:
>
> 1) Install ‘emacs’ and ‘emacs-auctex’.
> 2) Start Emacs and do M-: (require 'url), which will produce the
>    following backtrace:
>
> Debugger entered--Lisp error: (void-function TeX-add-style-hook)
>   (TeX-add-style-hook "url" #f(compiled-function () #<bytecode 0x48bbdd>) 
> LaTeX-dialect)
>   require(url)
>   eval((require (quote url)) nil)
>   eval-expression((require (quote url)) nil nil 127)
>   funcall-interactively(eval-expression (require (quote url)) nil nil 127)
>   call-interactively(eval-expression nil nil)
>   command-execute(eval-expression)
>
> It looks like Emacs tries to load the file
> $GUIX_PROFILE/share/emacs/site-lisp/style/url.elc, which is provided by
> ‘emacs-auctex’, instead of
> $GUIX_PROFILE/share/emacs/26.3/lisp/url/url.elc, which is provided by
> Emacs itself.
>
> Regards,
>
> Diego

This was caused by Emacs site-lisp/subdirs.el file, which when found in
a profile's union was causing Emacs to *recursively* add everything
under site-lisp to the load-path.

Fixed with commit a7a492899a.

Thank you for the report!

Closing,

Maxim