GNU bug report logs - #74447
30.0.92; asm-comment-char cannot be set via dir-local variables

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From: Johann Klähn <johann <at> jklaehn.de>
To: 74447 <at> debbugs.gnu.org
Subject: bug#74447: 30.0.92; asm-comment-char cannot be set via dir-local variables
Date: Wed, 20 Nov 2024 20:12:16 +0100

In `.dir-locals.el' setting `((asm-mode . ((asm-comment-char . 35))))'
does not have the desired effect.  The comment char is still `;' instead
of `#'.  The reason is that when the syntax table is adjusted according
to the comment char in the body of `asm-mode', the dir-local variables
haven't been loaded yet: `run-mode-hooks' (which would call
`hack-local-variables') is only invoked _after_ the `define-derived-mode'
body, i.e., too late.

I'm using the following workaround:

    (defun asm-mode-set-comment-char-from-dir-local-variables ()
      "Load `asm-comment-char' from dir-local variables.
    This is a HACK, since in `asm-mode', `run-mode-hooks' (which would call
    `hack-local-variables') is only invoked after the `define-derived-mode' body,
    i.e., too late."
      (let ((enable-local-variables :safe))
        (hack-dir-local-variables)
        (when-let* ((char (alist-get 'asm-comment-char dir-local-variables-alist)))
          (setq-local asm-comment-char char))))
    (add-hook 'asm-mode-set-comment-hook #'asm-mode-set-comment-char-from-dir-local-variables)

But maybe there is a more principled approach?

In GNU Emacs 30.0.92 (build 5, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.0) of 2024-11-19 built on toolbx
Repository revision: 331610aef0572eacb2846f817e979aa5e29170b7
Repository branch: emacs-30
System Description: Fedora Linux 41 (Workstation Edition)

Configured using:
 'configure --with-dbus --with-gif --with-jpeg --with-png --with-rsvg
 --with-tiff --with-xpm --with-gpm=no --with-modules --with-harfbuzz
 --with-cairo --with-native-compilation --enable-link-time-optimization
 --with-pgtk 'CFLAGS=-DMAIL_USE_LOCKF -O2 -fexceptions -g
 -grecord-gcc-switches -pipe -Wp,-D_FORTIFY_SOURCE=2
 -Wp,-D_GLIBCXX_ASSERTIONS -fstack-protector-strong -m64 -mtune=generic
 -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-z,relro'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB

Important settings:
  value of $LC_MONETARY: en_AU.UTF-8
  value of $LC_NUMERIC: en_AU.UTF-8
  value of $LC_TIME: en_AU.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Assembler

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