bug#63235: 29.0.90; makefile-mode does not recognize Plan 9's mk, mkfile

[Van Ly <van.ly@sdf.org>]

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The makefile-mode is not general enough to make use of Plan 9's user
space mkfile format and mk command.

This is likely to be considered not a bug.  The expected behavior is
Emacs would be smart with Plan 9's user space tools.  Specifically,
the mk command and mkfile format in this case.

The unexpected behavior attempts to compile using the make command and
not the mk command.  I tried to locate a PLAN9Makefile-mode but didn't
find one in the command completion mechanism.

steps to reproduce
 - set PLAN9 and PATH environment variables in shell
 - verify, mk all, works at the plain shell
 - start, emacs -Q
 - visit /tmp/mkfile; makefile-mode does not recognize mkfile
 - M-x makefile-mode
 - M-x compile RET; Compile command: make -k, should adapt to mk command

quote
# example /tmp/mkfile
all:V:
  echo This line is left blank intentionally.
  
quote ends




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In GNU Emacs 29.0.90 (build 1, aarch64-unknown-linux-gnu, GTK+ Version
 3.24.24, cairo version 1.16.0) of 2023-04-12 built on x23
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND
SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM
XINPUT2 XPM GTK3 ZLIB

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

Major mode: Makefile

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils time-date cl-loaddefs cl-lib shell
pcomplete compile text-property-search comint ansi-osc ansi-color ring
make-mode subr-x rmc iso-transl tooltip cconv eldoc paren electric
uniquify ediff-hook vc-hooks lisp-float-type elisp-mode 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 lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
timer select scroll-bar mouse jit-lock font-lock syntax font-core
term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine 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 emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit xinput2 x multi-tty make-network-process
emacs)

Memory information:
((conses 16 46529 7249)
 (symbols 48 6126 0)
 (strings 32 16262 1966)
 (string-bytes 1 484945)
 (vectors 16 10967)
 (vector-slots 8 163927 11590)
 (floats 8 23 18)
 (intervals 56 229 0)
 (buffers 984 12))