* bug#44319: make mode should recognize ::= as a macro assignment
@ 2020-10-29 20:34 Robert Lange via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-10-30 12:52 ` Lars Ingebrigtsen
0 siblings, 1 reply; 2+ messages in thread
From: Robert Lange via Bug reports for GNU Emacs, the Swiss army knife of text editors @ 2020-10-29 20:34 UTC (permalink / raw)
To: 44319
Using the following simple Makefile as an example:
Begin file Makefile
---
ELC_FILES ::= foo.elc
all: $(ELC_FILES)
.el.elc:
$(EMACS) -batch -Q -L . -f batch-byte-compile "$<"
---
End file Makefile
I've tested this on Emacs 26.1 on Debian, as well as a self-compiled 27.1. When I use the GNU immediate assignment operator `:=` the macro name ELC_FILES is correctly shown in font-lock in the macro color. But if I use the POSIX standard `::=` (well, forthcoming POSIX standard, but GNU emacs has supported it since v4.0) ELC_FILES is incorrectly shown in the target color.
Looking in lisp/progmodes/make-mode.el, the const makefile-macroassign-regex is pretty gnarly, but I *think* it should match a `::=`, so I'm assuming it's getting preempted by something else, probably the const makefile-dependency-regex. Unfortunately, that regexp is a bit more than I can interpret, and I don't dare change it because I'll almost certainly break some other obscure but legal cases.
I'd appreciate any insights anyone has on this.
--Rob Lange
---
In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
of 2019-09-22, modified by Debian built on x86-grnet-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)
Recent messages:
Loading /etc/emacs/site-start.d/50texlive-lang-english.el (source)...done
Loading delsel...done
Loading diff-hl...done
Loading hl-line...done
Loading paren...done
Loading xt-mouse...done
Starting new Ispell process aspell with default dictionary...
Starting Emacs daemon.
When done with this frame, type C-x 5 0
Making completion list...
Configured using:
'configure --build x86_64-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
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--with-sound=alsa --without-gconf --with-mailutils --build
x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
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--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-StqULU/emacs-26.1+1=. -fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
-D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'
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ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LIBSYSTEMD LCMS2
Important settings:
value of $LC_COLLATE: C.UTF-8
value of $LC_MONETARY: en_US.utf8
value of $LC_NUMERIC: en_US.utf8
value of $LC_TIME: en_DK.UTF-8
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
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company-mode: t
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/usr/share/emacs/site-lisp/auctex/texmathp hides /usr/share/auctex/texmathp
/usr/share/emacs/site-lisp/auctex/toolbar-x hides /usr/share/auctex/toolbar-x
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/usr/share/emacs/site-lisp/auctex/tex-bar hides /usr/share/auctex/tex-bar
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^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#44319: make mode should recognize ::= as a macro assignment
2020-10-29 20:34 bug#44319: make mode should recognize ::= as a macro assignment Robert Lange via Bug reports for GNU Emacs, the Swiss army knife of text editors
@ 2020-10-30 12:52 ` Lars Ingebrigtsen
0 siblings, 0 replies; 2+ messages in thread
From: Lars Ingebrigtsen @ 2020-10-30 12:52 UTC (permalink / raw)
To: Robert Lange; +Cc: 44319
Robert Lange <rlange@corusa.net> writes:
> I've tested this on Emacs 26.1 on Debian, as well as a self-compiled
> 27.1. When I use the GNU immediate assignment operator `:=` the macro
> name ELC_FILES is correctly shown in font-lock in the macro color. But
> if I use the POSIX standard `::=` (well, forthcoming POSIX standard,
> but GNU emacs has supported it since v4.0) ELC_FILES is incorrectly
> shown in the target color.
Yup. This bug is still present in Emacs 28.
> Looking in lisp/progmodes/make-mode.el, the const
> makefile-macroassign-regex is pretty gnarly, but I *think* it should
> match a `::=`, so I'm assuming it's getting preempted by something
> else, probably the const makefile-dependency-regex. Unfortunately,
> that regexp is a bit more than I can interpret, and I don't dare
> change it because I'll almost certainly break some other obscure but
> legal cases.
The bug seemed to be in makefile-match-dependency, which checked for
":=", but not for "::=", and I've now fixed this on the trunk.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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2020-10-29 20:34 bug#44319: make mode should recognize ::= as a macro assignment Robert Lange via Bug reports for GNU Emacs, the Swiss army knife of text editors
2020-10-30 12:52 ` Lars Ingebrigtsen
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