From 463fb43b0a92551296d2e723432f61f7ca521cd7 Mon Sep 17 00:00:00 2001
From: Peter Wemm <peter@FreeBSD.org>
Date: Wed, 22 Oct 1997 00:38:48 +0000
Subject: [PATCH] Recognize a %VERSREQ=nnnnn string in the system Makefile. 
 Both config(8) and the kernel will have a 'config interface version number'. 
 If an incompatable change is made to the kernel that requires a rebuild of
 config(8) (such as the cam devtab stuff), then the version number would be
 bumped in both places.  If a user neglects to rebuild config, then they will
 get a nagging (but non-fatal) warning that they need to rebuild config.

---
 usr.sbin/config/configvers.h | 11 +++++++++++
 usr.sbin/config/mkmakefile.c | 13 +++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)
 create mode 100644 usr.sbin/config/configvers.h

diff --git a/usr.sbin/config/configvers.h b/usr.sbin/config/configvers.h
new file mode 100644
index 000000000000..8a14166d8cce
--- /dev/null
+++ b/usr.sbin/config/configvers.h
@@ -0,0 +1,11 @@
+/*
+ * 6 digits of version.  The most significant are branch indicators
+ * (eg: RELENG_2_2 = 22, -current presently = 30 etc). The least
+ * significant digits are incremented for each incompatable change.
+ *
+ * The numbering scheme is inspired by the sys/conf/newvers.sh RELDATE
+ * and <osreldate.h> system.
+ *
+ * $Id$
+ */
+#define CONFIGVERS 300002
diff --git a/usr.sbin/config/mkmakefile.c b/usr.sbin/config/mkmakefile.c
index d1d758516cf4..852f86ea2780 100644
--- a/usr.sbin/config/mkmakefile.c
+++ b/usr.sbin/config/mkmakefile.c
@@ -36,7 +36,7 @@
 static char sccsid[] = "@(#)mkmakefile.c	8.1 (Berkeley) 6/6/93";
 #endif
 static const char rcsid[] =
-	"$Id$";
+	"$Id: mkmakefile.c,v 1.22 1997/09/15 06:37:09 charnier Exp $";
 #endif /* not lint */
 
 /*
@@ -51,6 +51,7 @@ static const char rcsid[] =
 #include <string.h>
 #include "y.tab.h"
 #include "config.h"
+#include "configvers.h"
 
 #define next_word(fp, wd) \
 	{ register char *word = get_word(fp); \
@@ -162,6 +163,7 @@ makefile()
 	struct opt *op;
 	struct users *up;
 	int warn_make_clean = 0;
+	int versreq;
 
 	read_files();
 	strcpy(line, "Makefile.");
@@ -242,7 +244,14 @@ makefile()
 			do_load(ofp);
 		else if (eq(line, "%CLEAN\n"))
 			do_clean(ofp);
-		else
+		else if (strncmp(line, "%VERSREQ=", sizeof("%VERSREQ=") - 1) == 0) {
+			versreq = atoi(line + sizeof("%VERSREQ=") - 1);
+			if (versreq != CONFIGVERS) {
+				fprintf(stderr, "WARNING: version of config(8) does not match kernel!\n");
+				fprintf(stderr, "config version = %d, ", CONFIGVERS);
+				fprintf(stderr, "version required = %d\n", versreq);
+			}
+		} else
 			fprintf(stderr,
 			    "Unknown %% construct in generic makefile: %s",
 			    line);