bug#50790: 27.1; GNUmakefile mode: Inline comments on variable assignment

[B9]

Hello,

This is a feature request, not a bug.

I love that GNUmakefile mode highlights whitespace that could be harmful
in a Makefile. It is quite helpful, but it could be better.

In particular, there should be a warning when a Makefile contains
something like this:

    export PATH+=:${GCC9000}/bin        # Use compiler from the future

As you know, that's a very common mistake in Makefiles because the tabs
up until the # are literally included in the variable assignment.

Request #1: Please have any whitespace at the end of an assignment
highlighted in the lovely danger-pink color Emacs uses to make other
potential whitespace errors visible. It should highlight until the end
of the line or the first # hash sign.

Request #2: If possible, change comment-dwim to do NOTHING when used on
a line that has an assignment. Currently M-; is a very easy and quick
way to break a Makefile in an invisible manner.

Thank you.


GARRULOUS AUTOMATIC SYSTEM INFO BELOW
----------------------------------------------------------------------
(Note: I tested this on emacs-27.1, but I am submitting the bug from an
older machine).

In GNU Emacs 26.1 (build 2, i686-pc-linux-gnu, GTK+ Version 3.24.7)
 of 2019-04-11, modified by Debian built on lgw01-amd64-057
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description:     Ubuntu 19.04

Configured using:
 'configure --build i686-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --enable-libsystemd --with-pop=yes
 
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --build
 i686-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
 --with-pop=yes
 
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --with-x=yes
 --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -fdebug-prefix-map=/build/emacs-266LUW/emacs-26.1+1=.
 -fstack-protector-strong -Wformat -Werror=format-security -Wall'
 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LIBSYSTEMD LCMS2

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: GNUmakefile

Minor modes in effect:
  diff-auto-refine-mode: t
  show-paren-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  display-time-mode: t
  save-place-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t

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Features:
(shadow sort mail-extr emacsbug sendmail cl-extra help-mode tabify
whitespace misearch multi-isearch hippie-exp time-stamp log-edit message
rmc puny rfc822 mml mml-sec epa derived epg gnus-util rmail
rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047
rfc2045 mm-util ietf-drums mail-prsvr mailabbrev mail-utils gmm-utils
mailheader pcvs-util add-log smerge-mode vc vc-dispatcher vc-git
diff-mode easy-mmode map make-mode tango-dark-theme which-func imenu
paren cus-start cus-load flow-ctrl dictionary link connection cl appt
diary-lib diary-loaddefs cal-menu calendar cal-loaddefs tramp-cmds tramp
tramp-compat tramp-loaddefs trampver ucs-normalize shell pcomplete
comint ansi-color ring parse-time format-spec cc-styles cc-align
cc-engine cc-vars cc-defs advice recentf tree-widget wid-edit edmacro
kmacro wdired dired dired-loaddefs ffap thingatpt time saveplace
finder-inf package easymenu epg-config url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache url-vars seq byte-opt gv bytecomp byte-compile cconv
cl-loaddefs cl-lib w3m-load erc-auto time-date mule-util tooltip eldoc
electric uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win
x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify lcms2 dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 8 297730 104102)
 (symbols 24 29467 2)
 (miscs 20 97 1172)
 (strings 16 54368 17830)
 (string-bytes 1 1668318)
 (vectors 12 44756)
 (vector-slots 4 939077 113900)
 (floats 8 74 504)
 (intervals 28 1719 112)
 (buffers 536 16))