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bug#18111: 24.3; makefile-gmake-mode: Doesn't fontify `subst' calls prop

From: Samuel Bronson
Subject: bug#18111: 24.3; makefile-gmake-mode: Doesn't fontify `subst' calls properly
Date: Fri, 25 Jul 2014 18:37:09 -0400

This problem has been bugging me for quite some time: `makefile-mode',
and now `makefile-gmake-mode', don't handle a construction used in,
for example, the following passage quoted from git's Makefile:

--8<---------------cut here---------------start------------->8---
# Shell quote (do not use $(call) to accommodate ancient setups);

SHA1_HEADER_SQ = $(subst ','\'',$(SHA1_HEADER))

DESTDIR_SQ = $(subst ','\'',$(DESTDIR))
bindir_SQ = $(subst ','\'',$(bindir))
bindir_relative_SQ = $(subst ','\'',$(bindir_relative))
mandir_relative_SQ = $(subst ','\'',$(mandir_relative))
infodir_relative_SQ = $(subst ','\'',$(infodir_relative))
localedir_SQ = $(subst ','\'',$(localedir))
gitexecdir_SQ = $(subst ','\'',$(gitexecdir))
template_dir_SQ = $(subst ','\'',$(template_dir))
htmldir_relative_SQ = $(subst ','\'',$(htmldir_relative))
prefix_SQ = $(subst ','\'',$(prefix))
gitwebdir_SQ = $(subst ','\'',$(gitwebdir))

SHELL_PATH_SQ = $(subst ','\'',$(SHELL_PATH))
PERL_PATH_SQ = $(subst ','\'',$(PERL_PATH))
PYTHON_PATH_SQ = $(subst ','\'',$(PYTHON_PATH))
TCLTK_PATH_SQ = $(subst ','\'',$(TCLTK_PATH))
DIFF_SQ = $(subst ','\'',$(DIFF))
--8<---------------cut here---------------end--------------->8---

Actually, the problem doesn't seem to be at all specific to subst; it
appears to apply to any function call.

Function calls are delimited only by balanced parens()/braces{}; there
is no special treatment of single or double quotes.  In fact, Make does
not appear to have *any* particular handling for either single or double
quotes; the only reason to even fontify them at all is that *shells* do.
(I wonder why the manual never actually seems to mention this fact?)

In GNU Emacs 24.3.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2014-06-06 on babin, modified by Debian
Windowing system distributor `Colin Harrison', version 11.0.60900031
System Description:     Debian GNU/Linux testing (jessie)

Configured using:
 `configure '--build' 'i486-linux-gnu' '--build' 'i486-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--with-crt-dir=/usr/lib/i386-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=lucid' '--with-toolkit-scroll-bars' '--without-gconf'
 '--without-gsettings' 'build_alias=i486-linux-gnu' 'CFLAGS=-g -O2
 -fstack-protector --param=ssp-buffer-size=4 -Wformat
 -Werror=format-security -Wall' 'LDFLAGS=-Wl,-z,relro'

Important settings:
  value of $LC_COLLATE: C
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: GNUmakefile

Minor modes in effect:
  shell-dirtrack-mode: t
  diff-auto-refine-mode: t
  xterm-mouse-mode: t
  show-paren-mode: t
  recentf-mode: t
  tooltip-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

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