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bug#35557: 26.1; false positive: Match data clobbered by buffer modifica
From: |
David Bremner |
Subject: |
bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks |
Date: |
Sat, 04 May 2019 08:35:57 -0300 |
1. Save the following as test.el
(let ((inhibit-modification-hooks t))
(with-temp-buffer
(insert "P'")
(goto-char (point-min))
(while (re-search-forward "\\([^\\]\\)'" nil t)
(replace-match "\\1`"))
(buffer-substring (point-min) (point-max))))
2. run "emacs --batch --quick --load ./test.el"
3. Under docker, with Debian's emacs-nox (but not emacs-lucid or
emacs-gtk, I get an error "Match data clobbered by buffer modification
hooks".
I don't think this is Debian specific, as someone was also able to
duplicate it with "nixpkgs.emacs26-nox" (also in Docker).
I agree the setup sounds pretty specific, but it is used by a Debian CI
setup, which is why I care.
Here's the build info, copied out of docker:
In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu)
of 2019-02-03, modified by Debian built on zam904
Recent messages:
Loading /etc/emacs/site-start.d/00debian.el (source)...done
For information about GNU Emacs and the GNU system, type C-h C-a.
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
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/sh\
are/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --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
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/sh\
are/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
--with-sound=alsa --without-gconf --with-mailutils --with-x=no
--without-gsettings 'CFLAGS=-g -O2
-fdebug-prefix-map=/build/emacs-26.1+1=. -fstack-protector-strong
-Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
-D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'
- bug#35557: 26.1; false positive: Match data clobbered by buffer modification hooks,
David Bremner <=