From 87a9001aa797245542ec8e3bc97e21282076afc0 Mon Sep 17 00:00:00 2001
From: espie <espie@openbsd.org>
Date: Thu, 21 Aug 2008 21:01:47 +0000
Subject: [PATCH] in gnu-m4 mode, allow definition of the empty macro (yes,
 autoconf 2.62 actually uses this, bleh)

okay otto@
---
 usr.bin/m4/eval.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/usr.bin/m4/eval.c b/usr.bin/m4/eval.c
index 258d3aae273..1968ad35413 100644
--- a/usr.bin/m4/eval.c
+++ b/usr.bin/m4/eval.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: eval.c,v 1.65 2008/08/16 12:25:21 espie Exp $	*/
+/*	$OpenBSD: eval.c,v 1.66 2008/08/21 21:01:47 espie Exp $	*/
 /*	$NetBSD: eval.c,v 1.7 1996/11/10 21:21:29 pk Exp $	*/
 
 /*
@@ -139,7 +139,7 @@ expand_builtin(const char *argv[], int argc, int td)
   */
   	ac = argc;
 
-	if (argc == 3 && !*(argv[2]))
+	if (argc == 3 && !*(argv[2]) && !mimic_gnu)
 		argc--;
 
 	switch (td & TYPEMASK) {
@@ -576,9 +576,10 @@ expand_macro(const char *argv[], int argc)
 void
 dodefine(const char *name, const char *defn)
 {
-	if (!*name)
+	if (!*name && !mimic_gnu)
 		m4errx(1, "null definition.");
-	macro_define(name, defn);
+	else 
+		macro_define(name, defn);
 }
 
 /*
@@ -612,9 +613,10 @@ dodefn(const char *name)
 static void
 dopushdef(const char *name, const char *defn)
 {
-	if (!*name)
+	if (!*name && !mimic_gnu)
 		m4errx(1, "null definition.");
-	macro_pushdef(name, defn);
+	else
+		macro_pushdef(name, defn);
 }
 
 /*
-- 
2.20.1