From 1a5850f8ccb916e3bc3c4504f528b25a0c422c86 Mon Sep 17 00:00:00 2001
From: Robin Haberkorn <robin.haberkorn@googlemail.com>
Date: Mon, 5 May 2025 22:19:37 +0300
Subject: automatically use the current date when building with Autotools

* It's actually the time of running ./configure that will be used.
* On OpenWatcom, it does not seem to be possible to set variables
  based on external processes, so you will still have to update
  AUTO_DATE in teco.h when releasing for DOS.
---
 configure.ac |  2 ++
 tecbuf.c     |  4 ++--
 teco.h       | 53 +++++++++++++++++++++++++++++------------------------
 3 files changed, 33 insertions(+), 26 deletions(-)

diff --git a/configure.ac b/configure.ac
index ff6117e..2f4d334 100644
--- a/configure.ac
+++ b/configure.ac
@@ -77,5 +77,7 @@ AC_CHECK_MEMBERS([struct termios.c_cflag, struct termios.c_ospeed, struct termio
 	#endif
 ])
 
+AC_DEFINE_UNQUOTED([AUTO_DATE], ["`date '+$Date: %Y/%m/%d %T $'`"], [Configuration time])
+
 AC_CONFIG_FILES([Makefile doc/Doxyfile])
 AC_OUTPUT
diff --git a/tecbuf.c b/tecbuf.c
index 03c1983..1bdfb13 100644
--- a/tecbuf.c
+++ b/tecbuf.c
@@ -34,7 +34,7 @@ struct buff_header *buff_create( char *name, char internal_flag );
 #include "teco.h"
 #include "tecparse.h"
 
-char rcs_date[] = AUTO_DATE;
+static const char rcs_date[] = AUTO_DATE;
 
 /*
  * Global Storage is defined here for lack of a better place.
@@ -1075,7 +1075,7 @@ register struct buff_header *hbp;
 char tmp_buffer[LINE_BUFFER_SIZE],padd_buffer[LINE_BUFFER_SIZE];
 register int i;
 int count;
-register char *cp;
+register const char *cp;
 int max_length;
 
     PREAMBLE();
diff --git a/teco.h b/teco.h
index eec13c1..713ee9a 100644
--- a/teco.h
+++ b/teco.h
@@ -41,38 +41,22 @@
 #define BLOCKED 2
 #define INVALIDATE 3
 
-#define VMAJOR 7
-#define VMINOR 0
-#define AUTO_DATE "$Date: 2007/12/10 22:13:07 $"
-
 /*
- * Immediately start insertion after the first escape in FS.
+ * There is redundancy with PACKAGE_VERSION, but this
+ * is preferred, as it will work with the OpenWatcom build system as well.
  */
-#define INTERACTIVE_FS
-
-/**
- * We define unix except for the really different operating systems, like
- * vms. It lets us write our own version of functions which simply do not
- * exist outside of unix.
- */
-#if !defined(VMS) && !defined(MSDOS)
-#define UNIX
-#define JOB_CONTROL
-#endif
+#define VMAJOR 7
+#define VMINOR 0
 
 /*
  * Include Files From GNU Autoconf/Autoheader
- *
- * FIXME: The Autoconf build system does not pass down -DHAVE_CONFIG_H.
- * This should be fixed by rewriting it as the original sources
- * are missing.
  */
-//#ifdef HAVE_CONFIG_H
-#ifndef __WATCOMC__
+#ifdef HAVE_CONFIG_H
+
 #include "config.h"
-#endif
 
-#ifdef MSDOS
+#elif defined(MSDOS)
+
 #define __WATCOM_LFN__
 #define STDC_HEADERS 1
 #define HAVE_STDIO_H 1
@@ -95,8 +79,29 @@
 #define HAVE_SBRK 1
 #define HAVE_STRCHR 1
 #define TERMCAP 1
+
 #endif /* MSDOS */
 
+#ifndef AUTO_DATE
+/* should be passed in from the build system */
+#define AUTO_DATE "$Date: 2007/12/10 22:13:07 $"
+#endif
+
+/*
+ * Immediately start insertion after the first escape in FS.
+ */
+#define INTERACTIVE_FS
+
+/**
+ * We define unix except for the really different operating systems, like
+ * vms. It lets us write our own version of functions which simply do not
+ * exist outside of unix.
+ */
+#if !defined(VMS) && !defined(MSDOS)
+#define UNIX
+#define JOB_CONTROL
+#endif
+
 #ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
 #endif
-- 
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