PR/57431 CVS commit: src/usr.bin/m4

["Luke Mewburn" <lukem%netbsd.org@localhost>]

The following reply was made to PR toolchain/57431; it has been noted by GNATS.

From: "Luke Mewburn" <lukem%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/57431 CVS commit: src/usr.bin/m4
Date: Wed, 24 May 2023 21:58:19 +0000

 Module Name:	src
 Committed By:	lukem
 Date:		Wed May 24 21:58:19 UTC 2023
 
 Modified Files:
 	src/usr.bin/m4: gnum4.c
 
 Log Message:
 m4 -g: { and } aren't supported in patsubst() or regexp()
 
 When running in -g (GNU m4) emulation, patsubst() and regexp()
 use the GNU m4 emacs-like regexes as implemented by gnulib,
 which don't support {..} intervals.
 When converting a GNU m4 regex to a POSIX ERE, escape raw { and }.
 
 Autoconf relies on the GNU m4 regex behaviour.
 
 See:
 - https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Redefined-M4-Macros.html
 - https://www.gnu.org/software/gnulib/manual/html_node/emacs-regular-expression-syntax.html
 
 This fixes the tools/compat/configure regen.
 
 PR toolchain/57431
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.11 -r1.12 src/usr.bin/m4/gnum4.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.