From e59f703bbcc0af949ee365206426b6394c340c6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Wolfgang=20St=C3=B6ggl?= <c72578@yahoo.de>
Date: Wed, 23 Mar 2022 17:58:45 +0100
Subject: [PATCH] Fix BUILD_DATE in rrdtool help output

- This is a followup to #1102
- Fixes segfault when running "rrdtool --help"
- Change DATE_FMT to the same date format as the __DATE__ macro [1]:
  mmm dd yyyy

[1] https://gcc.gnu.org/onlinedocs/cpp/Standard-Predefined-Macros.html

Upstream: https://github.com/oetiker/rrdtool-1.x/commit/e59f703bbcc0af949ee365206426b6394c340c6f

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
 configure.ac   | 2 +-
 src/rrd_tool.c | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 4d2345855..5169b0d49 100644
--- a/configure.ac
+++ b/configure.ac
@@ -695,7 +695,7 @@ AC_MSG_RESULT(${COMP_PERL:-No Perl Modules will be built})
 
 # Use reproducible build date and time
 if test "$SOURCE_DATE_EPOCH"; then
-	DATE_FMT="%d %b %Y %H:%M:%S"
+	DATE_FMT="%b %d %Y %H:%M:%S"
 	BUILD_DATE=$(LC_ALL=C date -u -d "@$SOURCE_DATE_EPOCH" "+$DATE_FMT")
 	AC_DEFINE_UNQUOTED([BUILD_DATE], ["$BUILD_DATE"], [Use reproducible build date])
 fi
diff --git a/src/rrd_tool.c b/src/rrd_tool.c
index 930d08272..cc6119d9a 100644
--- a/src/rrd_tool.c
+++ b/src/rrd_tool.c
@@ -45,11 +45,19 @@ static void PrintUsage(
     char *cmd)
 {
 
+#ifdef BUILD_DATE
+    const char *help_main =
+        N_("RRDtool %s"
+           "  Copyright by Tobias Oetiker <tobi@oetiker.ch>\n"
+           "               Compiled %s\n\n"
+           "Usage: rrdtool [options] command command_options\n");
+#else
     const char *help_main =
         N_("RRDtool %s"
            "  Copyright by Tobias Oetiker <tobi@oetiker.ch>\n"
            "               Compiled %s %s\n\n"
            "Usage: rrdtool [options] command command_options\n");
+#endif
 
     const char *help_list =
         N_