git: 8966cc0d01a2 - main - m4: import fixes from OpenBSD

The branch main has been updated by bapt:

URL: https://cgit.FreeBSD.org/src/commit/?id=8966cc0d01a29c11168e4e9d7f1703aa31ad3be6

commit 8966cc0d01a29c11168e4e9d7f1703aa31ad3be6
Author:     Baptiste Daroussin <bapt@FreeBSD.org>
AuthorDate: 2026-07-19 18:43:31 +0000
Commit:     Baptiste Daroussin <bapt@FreeBSD.org>
CommitDate: 2026-07-20 11:49:42 +0000

    m4: import fixes from OpenBSD
    
    - gnum4.c: fix m4_warnx() to use vwarnx() instead of warnx()
    - eval.c: improve error messages for empty macro names
    - extern.h: remove compute_prevep() declaration
    - Update OpenBSD version strings
    
    MFC After: 3 days
---
 usr.bin/m4/eval.c   | 6 +++---
 usr.bin/m4/extern.h | 3 +--
 usr.bin/m4/gnum4.c  | 4 ++--
 usr.bin/m4/look.c   | 2 +-
 4 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/usr.bin/m4/eval.c b/usr.bin/m4/eval.c
index 4f088e0415e0..6f96b5555965 100644
--- a/usr.bin/m4/eval.c
+++ b/usr.bin/m4/eval.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: eval.c,v 1.78 2019/06/28 05:35:34 deraadt Exp $	*/
+/*	$OpenBSD: eval.c,v 1.81 2026/02/25 05:37:25 op Exp $	*/
 /*	$NetBSD: eval.c,v 1.7 1996/11/10 21:21:29 pk Exp $	*/
 
 /*-
@@ -598,7 +598,7 @@ void
 dodefine(const char *name, const char *defn)
 {
 	if (!*name && !mimic_gnu)
-		m4errx(1, "null definition.");
+		m4errx(1, "define macro with empty name.");
 	else
 		macro_define(name, defn);
 }
@@ -635,7 +635,7 @@ static void
 dopushdef(const char *name, const char *defn)
 {
 	if (!*name && !mimic_gnu)
-		m4errx(1, "null definition.");
+		m4errx(1, "pushdef macro with empty name.");
 	else
 		macro_pushdef(name, defn);
 }
diff --git a/usr.bin/m4/extern.h b/usr.bin/m4/extern.h
index a411cb6d5891..bdee26be56bd 100644
--- a/usr.bin/m4/extern.h
+++ b/usr.bin/m4/extern.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: extern.h,v 1.55 2017/06/15 13:48:42 bcallah Exp $	*/
+/*	$OpenBSD: extern.h,v 1.57 2026/02/25 05:37:25 op Exp $	*/
 /*	$NetBSD: extern.h,v 1.3 1996/01/13 23:25:24 pk Exp $	*/
 
 /*-
@@ -93,7 +93,6 @@ extern int exit_code;
 
 /* misc.c */
 extern void	chrsave(int);
-extern char	*compute_prevep(void);
 extern void	getdiv(int);
 extern ptrdiff_t doindex(const char *, const char *);
 extern void	initspaces(void);
diff --git a/usr.bin/m4/gnum4.c b/usr.bin/m4/gnum4.c
index ecd89b5c8b6a..d7201533cb1a 100644
--- a/usr.bin/m4/gnum4.c
+++ b/usr.bin/m4/gnum4.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: gnum4.c,v 1.52 2017/08/21 21:41:13 deraadt Exp $ */
+/* $OpenBSD: gnum4.c,v 1.55 2025/11/05 17:10:45 tb Exp $ */
 
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
@@ -267,7 +267,7 @@ m4_warnx(const char *fmt, ...)
 	va_list ap;
 
 	va_start(ap, fmt);
-	warnx(fmt, ap);
+	vwarnx(fmt, ap);
 	va_end(ap);
 
 	if (fatal_warns)
diff --git a/usr.bin/m4/look.c b/usr.bin/m4/look.c
index c1fccd7dd8e5..c084baef30cf 100644
--- a/usr.bin/m4/look.c
+++ b/usr.bin/m4/look.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: look.c,v 1.24 2014/12/21 09:33:12 espie Exp $	*/
+/*	$OpenBSD: look.c,v 1.26 2026/02/25 05:37:25 op Exp $	*/
 
 /*-
  * SPDX-License-Identifier: BSD-3-Clause