CVS commit: [netbsd-10] src/usr.bin/m4

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Sun May 28 10:03:54 UTC 2023

Modified Files:
        src/usr.bin/m4 [netbsd-10]: gnum4.c

Log Message:
Pull up following revision(s) (requested by lukem in ticket #180):

        usr.bin/m4/gnum4.c: revision 1.12

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 -r1.11.2.1 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.